From £39,120
We are a small family run business with over 20 years experience in brickwork, bathroom/kitchen fitting, roofing, landscaping, fencing, tiling and ...
From £37,680
Trusted and professional extension builder in SO40. Experienced in all extension buildering work and keeping within budget and on quote. GMS Carpen...
From £40,020
Elmer Building Services ltd is an established extension buildering business in SO40. We come highly recommended and provide competitive quotes for ...
From £39,120
Bailey Construction Services are here to help customers who need an Extension Builder in SO40. We offer a competitive rate to complete all your ext...
From £51,000
Building extensions and conversions - commercial and domesticstructural repairsgroundworksdrainage workspaving, patios and concreti...
From £34,710
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £38,850
Need to find an Extension Builder near you for all your extension buildering work?
Mobile Services provides a local, trusted extension buil...
From £39,660
We are a Design and Build company based in Hampshire. Proud of our roots, we try to be the very best in the way we go about our business. Friendly...
From £39,030
Claytons Building and Roofing are here to help customers who need an Extension Builder in SO40. We offer a competitive rate to complete all your ex...
From £37,050
ROB DINE CONSTRUCTION is an established and experienced local extension builder in SO40. Please contact us for a free, no obligation quote and comp...

Comparing extension builders estimates for a Convert a basement 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 to convert a basement in SO40 by posting a job with HaMuch and we will send it to extension builders in SO40.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Convert A Basement near Totton | £34 | £243 |
| Convert A Basement near Southampton | £34 | £243 |
| Convert A Basement near Romsey | £32 | £230 |
| Convert A Basement near New Forest | £32 | £245 |
| Convert A Basement near Eastleigh | £34 | £244 |
| Convert A Basement near Chandler's Ford | £34 | £245 |
| Convert A Basement near Hedge End | £34 | £244 |
| Convert A Basement near Locks Heath | £33 | £240 |
| Convert A Basement near Winchester | £37 | £266 |
| Convert A Basement near Fareham | £35 | £250 |
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 - £17,689

Two storey extension - £88,283

Build a timber frame extension - £26,189

Build a swimming pool - £81,189

Single storey extension - £58,776

Side return extension - £43,624

Install an RSJ - £2,389

Outbuilding - £10,189

Build a Mansard loft conversion - £52,189

Loft conversion - £35,520

Build a kitchen extension - £42,189

Hip to gable loft conversion - £42,189

Granny annexe - £87,189

Garden office - £10,189

Convert a Garage - £16,189

Garage - £18,689

Build a flat roof extension - £22,189

Build a dormer loft conversion - £42,189

Concrete foundations - £6,439

Convert a bungalow loft - £29,189

Convert a basement - £39,624