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Select your affordable Garston extension builder
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...

Building a granny annexe ranges from £86,880 (MAX CONSTRUCTION LTD based in HA4) to £87,512 (Mandala Building Services based in WD6), but these are just estimates that can help give you an idea of who will be better value in your area.
The best thing to do is to get quotes to build a granny annexe in Garston by posting a job with HaMuch. We will send it to extension builders in Garston who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Watford | £43 | £280 |
| Granny Annexe near Bushey | £43 | £278 |
| Granny Annexe near Rickmansworth | £43 | £282 |
| Granny Annexe near Borehamwood | £42 | £271 |
| Granny Annexe near St Albans | £43 | £272 |
| Granny Annexe near Dacorum | £42 | £275 |
| Granny Annexe near Hemel Hempstead | £43 | £276 |
| Granny Annexe near Harrow | £43 | £270 |
| Granny Annexe near Hatfield | £42 | £266 |
| Granny Annexe 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