# Extension / renovation contractors in Hertfordshire

8 extension / renovation contractors near Hertfordshire, ranked by the strength of independent public evidence. Trust Score is used when available, drawing on reviews, credential evidence and registry data from named public sources, cross-checked wherever more than one source covers a business. No ads, no paid placement. Grouped by main trade first, then businesses that also offer this trade, with possibly closed businesses last. Highest Trust Score first within each group. All 8 are listed below, ranked by evidence.

| Trader | Location | Trust Score | Rating | Reviews | Named sources | Listed under |
| --- | --- | --- | --- | --- | --- | --- |
| [Cox Format Developments Limited](https://mytrustedtraders.com/traders/cox-format-developments-limited) | Barnet | 61/100 | 5.0/5 | 107 | Checkatrade, Which? Trusted Traders, FMB | Also offer this trade |
| [Herts Electrical Services Ltd](https://mytrustedtraders.com/traders/herts-electrical-services-ltd-electricians-north-h) | Stevenage Hertfordshire | Not shown | 5.0/5 | 353 | TrustATrader | Also offer this trade |
| [JW Building & Landscaping Services Ltd](https://mytrustedtraders.com/traders/jw-building-landscaping-services-ltd-blockpaving-d) | Hemel Hempstead Hertfordshire | Not shown | 5.0/5 | 251 | TrustATrader | Also offer this trade |
| [JW Building & Landscaping Services Ltd](https://mytrustedtraders.com/traders/jw-building-landscaping-services-ltd-ground-work-d) | St Albans Hertfordshire | Not shown | 5.0/5 | 251 | TrustATrader | Also offer this trade |
| [Upgrade Property Services Ltd](https://mytrustedtraders.com/traders/upgrade-property-services-ltd-3) | Waltham Cross Hertfordshire | Not shown | 5.0/5 | 131 | TrustATrader | Also offer this trade |
| [Architectural Brickwork Services](https://mytrustedtraders.com/traders/architectural-brickwork-services) | Watford Hertfordshire | Not shown | 5.0/5 | 70 | TrustATrader | Also offer this trade |
| [GP Property Services](https://mytrustedtraders.com/traders/gp-property-services-2) | Waltham Cross Herts | Not shown | 5.0/5 | 31 | Checkatrade, TrustATrader | Also offer this trade |
| [R Gabriel Carpentry & Building Services](https://mytrustedtraders.com/traders/r-gabriel-carpentry-building-services) | Hemel Hempstead Hertfordshire | Not shown | 5.0/5 | 8 | TrustATrader | Also offer this trade |

Each trader's full public evidence is at its profile URL (append `/md` for a Markdown version). See all extension / renovation contractors in the United Kingdom at `https://mytrustedtraders.com/find/extension-renovation`.

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Source: MyTrustedTraders. https://mytrustedtraders.com/find/extension-renovation/hertfordshire
Real public evidence only: every figure traces to a named source, and figures are cross-checked wherever more than one independent source covers the same business. If a source does not carry a field, it is not shown.