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Mandala Building Services is a family-owned design and build maintenance company, encompassing everything from residential refurbishment to large-s...
J Wijayamohan
JJSR Construction Ltd is an established and experienced local extension builder in Garston. Please contact us for a free, no obligation quote and c...
In an unstable market house extensions are often the most viable option, helping you to get the most out of the space you have without the addition...
Sharp Building Ltd is an established and experienced local extension builder in Garston. Please contact us for a free, no obligation quote and comp...
Mario Prajar Building Services is an established and experienced local extension builder in Garston. Please contact us for a free, no obligation qu...
Need to find an Extension Builder near you for all your extension buildering work?
MAX CONSTRUCTION LTD provides a local, trusted extension...
RLC Construction are here to help customers who need an Extension Builder in Garston. We offer a competitive rate to complete all your extension bu...
Relax... you have found a reliable extension builder in Garston. Building Service and Support Ltd is a friendly and reliable company based in Garst...
Ciaran Feeney
Need to find an Extension Builder near you for all your extension buildering work?
COMPLETE CIVIL ENGINEERING provides a local, trusted ext...
Chrysalis are here to help customers who need an Extension Builder in Garston. We offer a competitive rate to complete all your extension builderin...

Comparing extension builders estimates for Loft conversion gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
What to do - Get rates and quotes for the cost of a loft conversion in Garston by posting your job to extension builders in Garston.
"Loft conversion" - WD24, job posted 12/07/25
"Loft conversion - (2 Rooms and a shower) Total Area - 40 square metres)" - WD19, job posted 01/01/70
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Loft Conversion near Watford | £43 | £280 |
| Loft Conversion near Bushey | £43 | £278 |
| Loft Conversion near Rickmansworth | £43 | £282 |
| Loft Conversion near Borehamwood | £42 | £271 |
| Loft Conversion near St Albans | £43 | £272 |
| Loft Conversion near Dacorum | £42 | £275 |
| Loft Conversion near Hemel Hempstead | £43 | £276 |
| Loft Conversion near Harrow | £43 | £270 |
| Loft Conversion near Hatfield | £42 | £266 |
| Loft Conversion near High Barnet | £43 | £272 |
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 - £17,739

Two storey extension - £88,359

Build a timber frame extension - £26,239

Build a swimming pool - £81,239

Single storey extension - £59,784

Side return extension - £44,191

Install an RSJ - £2,439

Outbuilding - £10,239

Build a Mansard loft conversion - £52,239

Loft conversion - £35,993

Build a kitchen extension - £42,239

Hip to gable loft conversion - £42,239

Granny annexe - £87,239

Garden office - £10,239

Convert a Garage - £16,239

Garage - £18,739

Build a flat roof extension - £22,239

Build a dormer loft conversion - £42,239

Concrete foundations - £6,489

Convert a bungalow loft - £29,239

Convert a basement - £40,191