The 5 Best Windows & Doors in Llantrisant 2026

Ranked by real customer reviews, listing activity and Companies House verification. Updated weekly from public sources.

How this ranking is calculated

Composite score from real, publicly-verifiable signals only:

  • Google Business Profile star rating (when 3+ reviews)
  • Google Business Profile review count (log-scaled)
  • Verification sources: Companies House number, Google Business listing, Checkatrade, TrustATrader, claimed website
  • Operator-claimed listing status

No paid placement. No accepted listings. No fabricated reviews. Source data refreshed weekly.

  1. J P Windows & Conservatories Ltd is a window installer in Llantrisant, rated 4.9/5 from 100 Google reviews. Registered with Companies House (no. 04091812) and currently active. Established Google Business Profile with 10

    4.9★ (100 reviews)3 verification sources
    4.9★
    100 reviews

  2. Jon Thomas Windows is a window installer in Llantrisant, rated 4.8/5 from 26 Google reviews. Registered with Companies House (no. 13157585) and currently active. Verified Google Business Profile.

    4.8★ (26 reviews)3 verification sources
    4.8★
    26 reviews

  3. Ecoglaze UK Ltd is a window installer in Llantrisant, rated 4.7/5 from 266 Google reviews. Registered with Companies House (no. 11232932) and currently active. Established Google Business Profile with 266+ customer revie

    4.7★ (266 reviews)3 verification sources
    4.7★
    266 reviews
  4. Companies House registered
  5. Companies House registered

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