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Mandala Building Services is a family-owned design and build maintenance company, encompassing everything from residential refurbishment to large-s...
Peter Rourke
Trusted and professional extension builder in Hertfordshire. Experienced in all extension buildering work and keeping within budget and on quote. P...
Amarjeet Gill
Architecture and Construction all in one place.
FREE DRAWINGS for all projects we build.
At One Call Bathrooms we can tailor our service to provide a bespoke service to all Landlords and Management Agents that will guar...
Hertfordshire, AL10
Buyerz Trading is an established and experienced local extension builder in Hertfordshire. Please contact us for a free, no obligation quote and co...
Are you looking for resin driveways in North London? We are a leading builder of driveways and patios in North London. We have expertise in various...
Trusted and professional extension builder in Hertfordshire. Experienced in all extension buildering work and keeping within budget and on quote. A...
Hertfordshire, AL1
IC Builders have been helping customers in St Albans and the surrounding area by providing professional, trustworthy building services.We k...
London Elite Construction is an established extension buildering business in Hertfordshire. We come highly recommended and provide competitive quot...
BSL are here to help customers who need an Extension Builder in Hertfordshire. We offer a competitive rate to complete all your extension builderin...

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 Hertfordshire by posting a job with HaMuch and we will send it to extension builders in Hertfordshire.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Convert A Basement near St Albans | £43 | £272 |
| Convert A Basement near Hatfield | £42 | £266 |
| Convert A Basement near Harpenden | £45 | £282 |
| Convert A Basement near Borehamwood | £42 | £271 |
| Convert A Basement near Welwyn Garden City | £42 | £269 |
| Convert A Basement near Hemel Hempstead | £43 | £276 |
| Convert A Basement near Potters Bar | £43 | £273 |
| Convert A Basement near Bushey | £43 | £278 |
| Convert A Basement near Dacorum | £42 | £275 |
| Convert A Basement near Watford | £43 | £280 |
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 - £17,746

Two storey extension - £88,370

Build a timber frame extension - £26,246

Build a swimming pool - £81,246

Single storey extension - £59,928

Side return extension - £44,272

Install an RSJ - £2,446

Outbuilding - £10,246

Build a Mansard loft conversion - £52,246

Loft conversion - £36,060

Build a kitchen extension - £42,246

Hip to gable loft conversion - £42,246

Granny annexe - £87,246

Garden office - £10,246

Convert a Garage - £16,246

Garage - £18,746

Build a flat roof extension - £22,246

Build a dormer loft conversion - £42,246

Concrete foundations - £6,496

Convert a bungalow loft - £29,246

Convert a basement - £40,272