<?xml version="1.0" encoding="UTF-8"?>
<!-- <lastmod> IS STAMPED AT BUILD TIME since 2026-08-27. The OSC zip builder
     (warranty-booklet/rebuild-deploy-zip.ps1) derives every date below from git
     while packing the zip and ships the derived copy, so the dates that reach
     the server track the truth without anyone having to remember this file.
     Google reads <lastmod> to decide whether re-reading a page is worth its
     time, so a date behind the truth quietly delays a rewritten page getting
     back into search. Derivation, per page, is the rule this comment has
     always stated: a page with uncommitted edits counts as changed today;
     otherwise the page file's last commit date. Never the filesystem's
     Modified date, which OneDrive sync rewrites regardless of who actually
     touched the file.

     The dates typed below are therefore only a FALLBACK. A page keeps its
     typed date in the shipped copy only when git cannot answer for it during
     a build, and the builder says so in its output when that happens. Editing
     these dates by hand is no longer part of a release round; add a NEW page
     here with any plausible date and the next build will overwrite it.

     A HARD RULE FOR EDITING THIS FILE: never write two hyphens in a row
     anywhere inside a comment. The XML standard forbids it, and one double
     hyphen here once made this entire file malformed: every XML parser stops
     at that line, which means Google Search Console rejects the sitemap
     outright and reads NONE of the pages below, while the file looks
     completely normal. Whatever you want to say, say it without a double
     hyphen. The builder refuses the build if its stamped copy stops being
     well-formed XML, and store-switch-check sw-7a guards this tree copy. -->
<!-- The two legal pages are last on purpose — low priority for search, but they
     are listed rather than omitted because Intuit's app assessment checks that
     the privacy policy and EULA are genuinely public, and a sitemap entry is
     cheap corroboration that they are meant to be found. -->
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
  <url>
    <loc>https://www.openshowerco.com/</loc>
    <lastmod>2026-09-07</lastmod>
    <changefreq>monthly</changefreq>
    <priority>1.0</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/pricing.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.9</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/bathroom-remodel-cost-columbus.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.9</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/tub-to-shower-conversion-columbus.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.9</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/walk-in-curbless-shower-columbus.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.9</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/accessible-aging-in-place-bathroom-columbus.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/full-bathroom-remodel-columbus.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.9</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/how-long-tub-to-shower-conversion-takes.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/shower-wall-materials-guide.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/walk-in-shower-vs-tub-resale-value.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
  </url>
  <!-- The tile tier, added 2026-08-31. Custom tile and wet rooms sit ABOVE all
       five packaged systems and had no page of their own; they appeared only in
       passing clauses on pages about something else. -->
  <url>
    <loc>https://www.openshowerco.com/custom-tile-shower-columbus.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/wet-room-bathroom-columbus.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <!-- about.html, added 2026-08-31. /about is the URL an assistant looks for when
       it is establishing who a company is, and this site did not have one. High
       priority for that reason rather than for search traffic. -->
  <url>
    <loc>https://www.openshowerco.com/about.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
  </url>
  <!-- The comparison layer, added 2026-08-31. Comparison pages are quoted more
       often than any other kind because they answer "which should I pick", which
       is the question people actually ask. None of the three carries a price and
       none names another company. tools/kb-check.php asserts these loc lines. -->
  <url>
    <loc>https://www.openshowerco.com/shower-wall-systems-compared.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/shower-panels-vs-tile.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/one-day-shower-installation-explained.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <!-- Six suburb pages and three question pages, added 2026-08-31. The suburb
       pages are the build order SEO-AI-EXPOSURE-PLAN-2026-08-25 set and each is
       written on that town's own housing stock rather than the same page with a
       name swapped. None of the nine carries a price, so none of them has to move
       when a floor does. tools/kb-check.php asserts every one of these loc lines
       exists, so dropping one fails the gate rather than quietly costing the page
       its crawl budget. -->
  <url>
    <loc>https://www.openshowerco.com/tub-to-shower-conversion-westerville-ohio.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/tub-to-shower-conversion-dublin-ohio.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/tub-to-shower-conversion-powell-ohio.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/tub-to-shower-conversion-new-albany-ohio.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/tub-to-shower-conversion-upper-arlington-ohio.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/tub-to-shower-conversion-gahanna-ohio.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/what-is-included-tub-to-shower-conversion.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/how-the-guaranteed-price-works.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/bathroom-remodel-permit-columbus.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <!-- The second wave, added 2026-09-01: the guarantee explained, grab bars and
       seats, two more comparisons (walk-in tub against walk-in shower; refinish,
       reline, replace or convert) and installation day. Same rules as the first
       wave: no price on any of them, both copies of every answer from one source
       string, and tools/kb-check.php asserts each loc line below. -->
  <url>
    <loc>https://www.openshowerco.com/lifetime-leak-free-guarantee-explained.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/grab-bars-and-shower-seats-explained.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/walk-in-tub-vs-walk-in-shower.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/bathtub-refinishing-liner-or-replacement.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/what-happens-on-installation-day.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <!-- The third wave, added 2026-09-01: shower doors and glass, valves and
       fittings, cleaning and care, ventilation, and how to compare bids. Same
       rules as the first two waves: no price on any of them, both copies of
       every answer from one source string, and tools/kb-check.php asserts each
       loc line below. -->
  <url>
    <loc>https://www.openshowerco.com/shower-doors-and-glass-explained.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/shower-valves-and-fittings-explained.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/how-to-clean-and-care-for-a-walk-in-shower.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/bathroom-exhaust-fan-and-ventilation-explained.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/how-to-compare-bathroom-remodel-bids.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
  </url>
  <!-- The fourth knowledge base wave, added 2026-09-02: the three Columbus-market
       pages. The cost page is the one knowledge base page that carries dollar
       figures (all attributed; kb-anchor holds the two that are ours to the
       published floors). tools/kb-check.php asserts all three <loc> lines. -->
  <url>
    <loc>https://www.openshowerco.com/tub-to-shower-conversion-cost-columbus.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/bathroom-permit-trends-columbus.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/common-shower-systems-columbus.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <!-- The fifth knowledge base wave, added 2026-09-02: Columbus water, storage,
       the five-by-eight bathroom, ten years of upkeep, the Design Studio pictures.
       tools/kb-check.php asserts all five <loc> lines. -->
  <url>
    <loc>https://www.openshowerco.com/columbus-water-hardness-and-your-shower.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/shower-niches-shelves-and-storage-explained.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/small-bathroom-five-by-eight-walk-in-shower.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/what-a-walk-in-shower-costs-to-keep-ten-years.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/design-studio-pictures-explained.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <!-- The sixth knowledge base wave, added 2026-09-05: Central Ohio water, sewers and
       plumbing, and the history of the Ohio bathroom. Seven pages, every figure sourced and
       verified at source; tools/kb-check.php asserts all seven <loc> lines. -->
  <url>
    <loc>https://www.openshowerco.com/columbus-water-supply-where-it-comes-from.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/columbus-sewers-then-and-now.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/sewer-lateral-and-house-drains-central-ohio.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/supply-pipes-in-central-ohio-houses-by-era.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/ohio-plumbing-code-and-license-explained.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/wells-and-septic-central-ohio-bathroom.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/indoor-plumbing-history-ohio.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <!-- The seventh knowledge base wave, added 2026-09-05: hot water, the town-by-town
       providers, the water quality report, toilets, lead paint and asbestos, and bathrooms
       per house by decade. Six pages, every figure verified at source; tools/kb-check.php
       asserts all six <loc> lines. -->
  <url>
    <loc>https://www.openshowerco.com/hot-water-for-a-central-ohio-shower.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/water-and-sewer-providers-central-ohio-towns.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/columbus-water-quality-report-explained.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/toilets-in-a-bathroom-remodel-ohio.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/lead-paint-asbestos-pre-1978-bathroom-ohio.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/bathrooms-per-house-ohio-by-decade.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <!-- The eighth knowledge base wave, added 2026-09-06: bathroom electrical under the Ohio
       code, and what is under a Central Ohio bathroom floor by era. Two pages, every figure
       verified at source; tools/kb-check.php asserts both <loc> lines. -->
  <url>
    <loc>https://www.openshowerco.com/bathroom-electrical-ohio-gfci-fan-and-lights.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/bathroom-floors-and-subfloors-central-ohio-by-era.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <!-- The ninth knowledge base wave, added 2026-09-06: the bathroom and sanitation history of
       particular Central Ohio places, one page each, every figure verified at source;
       tools/kb-check.php asserts every <loc> line. -->
  <url>
    <loc>https://www.openshowerco.com/german-village-bathrooms-and-sanitation-history.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/king-lincoln-district-bathrooms-and-sanitation-history.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/franklinton-flood-sewers-and-bathrooms-history.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/early-suburbs-bexley-upper-arlington-grandview-bathrooms-history.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/westerville-water-sewers-and-bathrooms-history.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/worthington-water-sewers-and-bathrooms-history.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/gahanna-water-sewers-and-bathrooms-history.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <!-- The eleventh knowledge base wave, added 2026-09-06: seven more Central Ohio places, their
       bathrooms and their sanitation, one page each, every figure verified at source;
       tools/kb-check.php asserts every <loc> line. -->
  <url>
    <loc>https://www.openshowerco.com/flytown-short-north-bathrooms-and-sanitation-history.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/clintonville-old-north-water-sewers-and-bathrooms-history.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/hilltop-columbus-water-sewers-and-bathrooms-history.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/linden-columbus-water-sewers-and-bathrooms-history.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/south-side-merion-village-steelton-bathrooms-and-sanitation-history.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/dublin-ohio-water-sewers-and-bathrooms-history.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/delaware-ohio-springs-water-sewers-and-bathrooms-history.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <!-- The sources-and-data page, added 2026-09-07: how the knowledge base is sourced and verified,
       and the claims behind every page published as JSON under kb-data/. -->
  <url>
    <loc>https://www.openshowerco.com/knowledge-base-sources-and-data.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <!-- The photograph archive page, added 2026-09-07: every rights-cleared image the place and
       building histories gathered, with its archive, date and rights statement. -->
  <url>
    <loc>https://www.openshowerco.com/central-ohio-water-sewers-and-bathrooms-photograph-archive.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <!-- The tenth knowledge base wave, added 2026-09-06 (run as wave nine, renumbered at the merge): Central Ohio house styles by era, the
              people and companies that shaped them, how the houses were built and of what, and the
              bathroom inside them era by era. Four pages, every figure verified at source;
              tools/kb-check.php asserts all four <loc> lines. -->
  <url>
    <loc>https://www.openshowerco.com/central-ohio-house-styles-by-era.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/who-shaped-central-ohio-houses-by-era.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/how-central-ohio-houses-were-built-by-era.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/bathroom-styles-and-fixtures-central-ohio-by-era.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <!-- The twelfth knowledge base wave, added 2026-09-06: the fires, floods and collapses behind
              Ohio's building rules, what goes wrong in a Central Ohio house and why, what Ohio made for
              houses, and how to tell a house's era and style. Four pages, every figure verified at
              source; tools/kb-check.php asserts all four <loc> lines. -->
  <url>
    <loc>https://www.openshowerco.com/ohio-fires-floods-and-collapses-that-changed-building-rules.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/what-goes-wrong-in-a-central-ohio-house-soils-water-radon-termites-and-weather.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/what-ohio-made-for-houses-brick-tile-glass-gypsum-and-steel.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/how-to-tell-what-era-and-style-a-central-ohio-house-is.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <!-- The thirteenth knowledge base wave, added 2026-09-07: which building code a Central Ohio
              house was built under, what wiring a house has by era, Central Ohio's floods and the works
              built after them, and heating by era. Four pages, every figure verified at source;
              tools/kb-check.php asserts all four <loc> lines. -->
  <url>
    <loc>https://www.openshowerco.com/which-building-code-a-central-ohio-house-was-built-under.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/what-wiring-a-central-ohio-house-has-by-era.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/central-ohio-floods-dams-levees-and-floodwalls.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/heating-a-central-ohio-house-by-era-coal-gas-furnaces-and-chimneys.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <!-- The fourteenth knowledge base wave, added 2026-09-08: how Columbus came to inspect its
              houses, the window era by era, the Hocking Valley coal towns that heated the city, and the
              three counties beside Franklin by the numbers. Four pages, every figure verified at source;
              tools/kb-check.php asserts all four <loc> lines. -->
  <url>
    <loc>https://www.openshowerco.com/how-columbus-came-to-inspect-its-houses-building-plumbing-wiring-and-smoke.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/windows-and-glass-in-a-central-ohio-house-by-era.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/hocking-valley-coal-towns-that-heated-columbus.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/delaware-licking-and-fairfield-county-houses-by-the-numbers.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <!-- The knowledge base, added 2026-08-31. The hub first, then the glossary it
       indexes. Both are reference pages rather than selling pages, so they sit
       below the service pages on priority and above the legal ones. They carry
       no price at all, which is why nothing here has to move when a floor does.
       tools/kb-check.php asserts that both of these <loc> lines exist, so
       deleting one fails the gate rather than quietly costing the pages their
       crawl budget. -->
  <url>
    <loc>https://www.openshowerco.com/knowledge-base.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/bathroom-remodeling-glossary.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/visualizer.php</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.9</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/quote.html</loc>
    <lastmod>2026-09-08</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
  </url>
  <!-- THE SHOP IS OUT OF THE SITEMAP WHILE IT IS SHUT (2026-08-12).
       inc/store-switch.php holds the shop closed for the public launch, and
       shop.php answers with the "opening soon" page and an X-Robots-Tag:
       noindex header while it is. Listing it here would ask Google to index
       that holding page as if it were the storefront — and a "Shop" result
       that leads to "opening soon" is worse for us than no result at all.
       PUT THIS BLOCK BACK when the shop reopens (Store Manager -> Overview ->
       "Open the shop to the public") and set lastmod to that day:
  <url>
    <loc>https://www.openshowerco.com/shop.php</loc>
    <lastmod>2026-08-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.8</priority>
  </url>
  -->
  <url>
    <loc>https://www.openshowerco.com/privacy.html</loc>
    <lastmod>2026-09-03</lastmod>
    <changefreq>yearly</changefreq>
    <priority>0.3</priority>
  </url>
  <url>
    <loc>https://www.openshowerco.com/terms.html</loc>
    <lastmod>2026-09-03</lastmod>
    <changefreq>yearly</changefreq>
    <priority>0.3</priority>
  </url>
</urlset>
