From £10,056
Surrey, TW18
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £10,096
We have over 15 years of experience in the building trade. We are a small family run business and pride ourselves on our exceptional customer servi...
From £10,232
Angus, TW18
Need an Extension Builder in TW18? ABCXYZ has been helping local clients (10 mile radius) with their extension buildering jobs for many years. Get ...
From £10,296
Experienced extension builder ready to quote for your work. Surrey Property Renovations Ltd is the best extension builder in TW18. No obligation fr...
From £10,080
General Builders is an established and experienced local extension builder in TW18. Please contact us for a free, no obligation quote and competiti...
From £10,400
Need to find an Extension Builder near you for all your extension buildering work?
AMG Construction Services provides a local, trusted exte...
From £10,464
Kandy Build and Construction Ltd is an established extension buildering business in TW18. We come highly recommended and provide competitive quotes...
From £9,728
At VEM Insulation Limited, we specialize in providing top-tier construction services including Exterior and interior Insulation, Plumbing and Drain...
From £10,016
We offer a wide range of building services to meet every type of projects.- Bathroom renovation- Kitchen refurbishment- Home extensions / conservat...
From £10,248
Relax... you have found a reliable extension builder in TW18. Bizy Construction Ltd is a friendly and reliable company based in TW18 who consider n...

Outbuilding costs in TW18 range from the cheapest of £9,728 (VEM INSULATION LIMITED based in tw19) to the dearest of £10,464 (Kandy Build and Construction Ltd based in TW20), but these are just estimates.
Comparing extension builders estimates for building an outbuilding gives you an idea of who will be better value, but the best way to compare costs is to get actual quotes.
Get rates and quotes to build an outbuilding in TW18 by posting a job with HaMuch and we will send it to extension builders.
"Outbuilding" - STAINES-UPON-THAMES, job posted 08/06/25
"Erection of new 7mx4m Outbuilding in back Garden for use as Gym/Office" - TW15, job posted 01/01/70
| Borough in London |
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| Outbuilding in Staines |
| Outbuilding in Stanwell |
| Outbuilding in Egham |
| Outbuilding in Ashford |
| Outbuilding in Chertsey |
| Outbuilding in Virginia Water |
| Outbuilding in Shepperton |
| Outbuilding in Heathrow |
| Outbuilding in Sunbury-on-Thames |
| Outbuilding in Hatton |
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 - £17,662

Two storey extension - £88,242

Build a timber frame extension - £26,162

Build a swimming pool - £81,162

Single storey extension - £58,232

Side return extension - £43,318

Install an RSJ - £2,362

Outbuilding - £10,162

Build a Mansard loft conversion - £52,162

Loft conversion - £35,265

Build a kitchen extension - £42,162

Hip to gable loft conversion - £42,162

Granny annexe - £87,162

Garden office - £10,162

Convert a Garage - £16,162

Garage - £18,662

Build a flat roof extension - £22,162

Build a dormer loft conversion - £42,162

Concrete foundations - £6,412

Convert a bungalow loft - £29,162

Convert a basement - £39,318