From £87,480
Premium Design Construction Ltd. specialise in home remodelling and refurbishments from start to finish. Extensions, Loft conversion, bespoke carp...
From £86,864
Trusted and professional extension builder in Potters Bar. Experienced in all extension buildering work and keeping within budget and on quote. Adv...
From £87,256
Need to find an Extension Builder near you for all your extension buildering work?
JMB Design & Build provides a local, trusted extension b...
From £87,080
JMB Design & Build is a full service building construction company dedicated to building and improving residential and commercial structures accord...
From £86,896
Need to find an Extension Builder near you for all your extension buildering work?
TMP build solutions ltd provides a local, trusted extens...
From £87,000
TMP Build Solutions is a reputable building company that specialises in loft conversions and extensions. The team has a diverse range of trade skil...
From £86,904
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £87,112
Trusted and professional extension builder in Potters Bar. Experienced in all extension buildering work and keeping within budget and on quote. SWB...
From £87,328
BSL are here to help customers who need an Extension Builder in Potters Bar. We offer a competitive rate to complete all your extension buildering ...
From £87,264
London Elite Construction is an established extension buildering business in Potters Bar. We come highly recommended and provide competitive quotes...

Building a granny annexe ranges from £86,864 (Advance Construction Solutions based in EN6) to £87,480 (Premium Design Construction LTD based in EN6), 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 Potters Bar by posting a job with HaMuch. We will send it to extension builders in Potters Bar who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Potters Bar | £43 | £273 |
| Granny Annexe near High Barnet | £43 | £272 |
| Granny Annexe near Hatfield | £64 | £283 |
| Granny Annexe near Cheshunt | £48 | £285 |
| Granny Annexe near Borehamwood | £42 | £270 |
| Granny Annexe near Welwyn Garden City | £42 | £268 |
| Granny Annexe near Muswell Hill | £44 | £273 |
| Granny Annexe near St Albans | £63 | £288 |
| Granny Annexe near Brent Cross | £43 | £272 |
| Granny Annexe near Hertford | £46 | £289 |
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 - £17,618

Two storey extension - £88,178

Build a timber frame extension - £26,118

Build a swimming pool - £81,118

Single storey extension - £57,368

Side return extension - £42,832

Install an RSJ - £2,318

Outbuilding - £10,118

Build a Mansard loft conversion - £52,118

Loft conversion - £34,860

Build a kitchen extension - £42,118

Hip to gable loft conversion - £42,118

Granny annexe - £87,118

Garden office - £10,118

Convert a Garage - £16,118

Garage - £18,618

Build a flat roof extension - £22,118

Build a dormer loft conversion - £42,118

Concrete foundations - £6,368

Convert a bungalow loft - £29,118

Convert a basement - £38,832