From £17,420
Experienced extension builder ready to quote for your work. BBS & sons construction uk ltd is the best extension builder in Rayners Lane. No obliga...
From £18,004
MGJ Construction House Renovation is an established extension buildering business in Rayners Lane. We come highly recommended and provide competiti...
From £17,540
Relax... you have found a reliable extension builder in Rayners Lane. Prospective Builders Ltd is a friendly and reliable company based in Rayners ...
From £17,492
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,988
We pride ourselves on going that extra mile to ensure our jobs stand out from the rest. We work closely with our clients to carefully understand th...
From £17,828
Need an Extension Builder in Rayners Lane? H CAROLAN CONSTRUCTION has been helping local clients (10 mile radius) with their extension buildering j...
From £17,660
Relax... you have found a reliable extension builder in Rayners Lane. OM BUILDERS is a friendly and reliable company based in Rayners Lane who cons...
From £17,980
Trusted and professional extension builder in Rayners Lane. Experienced in all extension buildering work and keeping within budget and on quote. K ...
From £17,484
We are a team of professionals who specialise in: Kitchen Installation Kitchen and Bathroom refurbishment Bespoke furniture for: Kitchen Livi...
From £17,580
Relax... you have found a reliable extension builder in Rayners Lane. West7Services UK is a friendly and reliable company based in Rayners Lane who...

Underpinning ranges from £17,420 (BBS & sons construction uk ltd based in HA2) to £18,004 (MGJ Construction House Renovation based in HA2), but the final cost will depend on the method of underpinning used, how much of your foundations need underpinning and where you live.
Comparing extension builders estimates for underpinning gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
Get quotes to underpin your home in Rayners Lane by posting a job with HaMuch and we will send it to extension builders in Rayners Lane.
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 - £17,698

Two storey extension - £88,296

Build a timber frame extension - £26,198

Build a swimming pool - £81,198

Single storey extension - £58,952

Side return extension - £43,723

Install an RSJ - £2,398

Outbuilding - £10,198

Build a Mansard loft conversion - £52,198

Loft conversion - £35,603

Build a kitchen extension - £42,198

Hip to gable loft conversion - £42,198

Granny annexe - £87,198

Garden office - £10,198

Convert a Garage - £16,198

Garage - £18,698

Build a flat roof extension - £22,198

Build a dormer loft conversion - £42,198

Concrete foundations - £6,448

Convert a bungalow loft - £29,198

Convert a basement - £39,723