From £87,916
STYLE BUILDING SERVICES LTD are here to help customers who need an Extension Builder in Welwyn Garden City. We offer a competitive rate to complete...
From £88,636
Wiemy jak wa?n? decyzj? dla naszych Klientów jest budowa kupno czy remont domu, dlatego stawiamy na nowoczesne i ekonomiczne rozwi?zania , a ca?? ...
From £88,252
LBH Building & Property Services are here to help customers who need an Extension Builder in Welwyn Garden City. We offer a competitive rate to com...
From £88,720
We offer an extensive building service including a turnkey solution. We are experts in residential extensions, alterations and new builds in the He...
From £88,600
J&R Property is an established and experienced local extension builder in Welwyn Garden City. Please contact us for a free, no obligation quote and...
From £86,980
Complex Construction is an established extension buildering business in Welwyn Garden City. We come highly recommended and provide competitive quot...
From £88,312
NJG BUILDING SOLUTIONS LTD is an established and experienced local extension builder in Welwyn Garden City. Please contact us for a free, no obliga...
From £88,276
Lemsford Building is a trusted extension builder serving customers in Welwyn Garden City and the surrounding area. Contact us to today to get a com...
From £88,528
Trusted and professional extension builder in Welwyn Garden City. Experienced in all extension buildering work and keeping within budget and on quo...

Costs range from £86,980 (Complex Construction based in AL7) to £88,720 (Herts Premier Builders based in AL7), but these are just estimates. The best way to compare costs is to get real quotes from real builders.
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| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Two Storey Extension near Welwyn Garden City | £42 | £268 |
| Two Storey Extension near Hatfield | £64 | £283 |
| Two Storey Extension near Hertford | £46 | £289 |
| Two Storey Extension near Potters Bar | £43 | £273 |
| Two Storey Extension near Harpenden | £86 | £315 |
| Two Storey Extension near St Albans | £63 | £288 |
| Two Storey Extension near Ware | £47 | £296 |
| Two Storey Extension near Cheshunt | £48 | £285 |
| Two Storey Extension near Stevenage | £44 | £282 |
| Two Storey Extension near Hoddesdon | £46 | £296 |
Whether you’re looking to extend your kitchen with a side return extension or you want to convert your basement into a liveable space, read our cost guides to get an idea of how much each project costs before getting a more accurate quote from our database of reliable tradespeople.

Underpin a building - £17,637

Two storey extension - £88,205

Build a timber frame extension - £26,137

Build a swimming pool - £81,137

Single storey extension - £57,736

Side return extension - £43,039

Install an RSJ - £2,337

Outbuilding - £10,137

Build a Mansard loft conversion - £52,137

Loft conversion - £35,033

Build a kitchen extension - £42,137

Hip to gable loft conversion - £42,137

Granny annexe - £87,137

Garden office - £10,137

Convert a Garage - £16,137

Garage - £18,637

Build a flat roof extension - £22,137

Build a dormer loft conversion - £42,137

Concrete foundations - £6,387

Convert a bungalow loft - £29,137

Convert a basement - £39,039