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Relax... you have found a reliable extension builder in Welwyn Garden City. Up and Out Builds Ltd is a friendly and reliable company based in Welwy...
Peter Rourke
Trusted and professional extension builder in Welwyn Garden City. Experienced in all extension buildering work and keeping within budget and on quo...
Amarjeet Gill
Architecture and Construction all in one place.
FREE DRAWINGS for all projects we build.
At One Call Bathrooms we can tailor our service to provide a bespoke service to all Landlords and Management Agents that will guar...
Buyerz Trading is an established and experienced local extension builder in Welwyn Garden City. Please contact us for a free, no obligation quote a...
Are you looking for resin driveways in North London? We are a leading builder of driveways and patios in North London. We have expertise in various...
Trusted and professional extension builder in Welwyn Garden City. Experienced in all extension buildering work and keeping within budget and on quo...
IC Builders have been helping customers in St Albans and the surrounding area by providing professional, trustworthy building services.We k...
London Elite Construction is an established extension buildering business in Welwyn Garden City. We come highly recommended and provide competitive...
BSL are here to help customers who need an Extension Builder in Welwyn Garden City. We offer a competitive rate to complete all your extension buil...

In Welwyn Garden City, prices for dormer loft conversions range from £41,864 (Advance Construction Solutions based in EN6) to £42,536 (R. Newman Construction based in AL4), but how much your conversion costs will vary depending on the size of your property, how easy access to your roof is and what you want to use the space for.
The best way to get an accurate price is to compare quotes from extension builders in Welwyn Garden City. Post your job on HaMuch now and we'll put you in touch with available extension builders.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Dormer Loft Conversion near Welwyn Garden City | £42 | £269 |
| Build A Dormer Loft Conversion near Hatfield | £42 | £266 |
| Build A Dormer Loft Conversion near Hertford | £46 | £290 |
| Build A Dormer Loft Conversion near Potters Bar | £43 | £273 |
| Build A Dormer Loft Conversion near Harpenden | £45 | £282 |
| Build A Dormer Loft Conversion near St Albans | £43 | £272 |
| Build A Dormer Loft Conversion near Ware | £47 | £296 |
| Build A Dormer Loft Conversion near Cheshunt | £48 | £285 |
| Build A Dormer Loft Conversion near Stevenage | £44 | £282 |
| Build A Dormer Loft Conversion 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 - £17,741

Two storey extension - £88,361

Build a timber frame extension - £26,241

Build a swimming pool - £81,241

Single storey extension - £59,816

Side return extension - £44,209

Install an RSJ - £2,441

Outbuilding - £10,241

Build a Mansard loft conversion - £52,241

Loft conversion - £36,008

Build a kitchen extension - £42,241

Hip to gable loft conversion - £42,241

Granny annexe - £87,241

Garden office - £10,241

Convert a Garage - £16,241

Garage - £18,741

Build a flat roof extension - £22,241

Build a dormer loft conversion - £42,241

Concrete foundations - £6,491

Convert a bungalow loft - £29,241

Convert a basement - £40,209