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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...

Building a granny annexe ranges from £86,864 (Advance Construction Solutions based in EN6) to £87,536 (R. Newman Construction based in AL4), 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 Hertfordshire by posting a job with HaMuch. We will send it to extension builders in Hertfordshire who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near St Albans | £43 | £272 |
| Granny Annexe near Hatfield | £42 | £266 |
| Granny Annexe near Harpenden | £45 | £282 |
| Granny Annexe near Borehamwood | £42 | £271 |
| Granny Annexe near Welwyn Garden City | £42 | £269 |
| Granny Annexe near Hemel Hempstead | £43 | £276 |
| Granny Annexe near Potters Bar | £43 | £273 |
| Granny Annexe near Bushey | £43 | £278 |
| Granny Annexe near Dacorum | £42 | £275 |
| Granny Annexe 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