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Select your affordable SG12 extension builder
Relax... you have found a reliable extension builder in SG12. Up and Out Builds Ltd is a friendly and reliable company based in SG12 who consider n...
Herts Loft Ltd is an established extension buildering business in SG12. We come highly recommended and provide competitive quotes for your work.
From £42,424
Hopson Bros Services is a trusted extension builder serving customers in SG12 and the surrounding area. Contact us to today to get a competitive qu...
From £42,224
Experienced extension builder ready to quote for your work. Groome & Sons Ltd is the best extension builder in SG12. No obligation free quotes and ...
From £42,384
D E BRACKEN BUILDING SERVICES is an established and experienced local extension builder in SG12. Please contact us for a free, no obligation quote ...
From £42,160
R & T Complete Building Services is an established and experienced local extension builder in SG12. Please contact us for a free, no obligation quo...
From £42,272
Landmark General Builders Ltd are here to help customers who need an Extension Builder in SG12. We offer a competitive rate to complete all your ex...
From £42,128
Nicholas James Home Improvements Ltd are here to help customers who need an Extension Builder in SG12. We offer a competitive rate to complete all ...
From £42,000
Need to find an Extension Builder near you for all your extension buildering work?
J B R Contracts provides a local, trusted extension buil...
From £42,224
Need an Extension Builder in SG12? TJJ Construction Ltd has been helping local clients (10 mile radius) with their extension buildering jobs for ma...

In SG12, prices for dormer loft conversions range from £42,000 (J B R Contracts based in SG14) to £42,456 (Up and Out Builds Ltd based in SG12), 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 SG12. 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 Ware | £47 | £296 |
| Build A Dormer Loft Conversion near Hertford | £46 | £290 |
| Build A Dormer Loft Conversion near Hoddesdon | £46 | £296 |
| Build A Dormer Loft Conversion near East Hertfordshire | £44 | £289 |
| Build A Dormer Loft Conversion near Welwyn Garden City | £42 | £269 |
| Build A Dormer Loft Conversion near Cheshunt | £48 | £285 |
| Build A Dormer Loft Conversion near Harlow | £43 | £288 |
| Build A Dormer Loft Conversion near Hatfield | £42 | £266 |
| Build A Dormer Loft Conversion near Stevenage | £44 | £282 |
| Build A Dormer Loft Conversion near Potters Bar | £43 | £273 |
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 - £17,746

Two storey extension - £88,370

Build a timber frame extension - £26,246

Build a swimming pool - £81,246

Single storey extension - £59,928

Side return extension - £44,272

Install an RSJ - £2,446

Outbuilding - £10,246

Build a Mansard loft conversion - £52,246

Loft conversion - £36,060

Build a kitchen extension - £42,246

Hip to gable loft conversion - £42,246

Granny annexe - £87,246

Garden office - £10,246

Convert a Garage - £16,246

Garage - £18,746

Build a flat roof extension - £22,246

Build a dormer loft conversion - £42,246

Concrete foundations - £6,496

Convert a bungalow loft - £29,246

Convert a basement - £40,272