1 review
From £87,192
NIECEIC / NAAPIT GASSAFE WATER REGULATIONS We offer services towards completion of high end construction projects to dis...
"Did callout made safe my elctrical work thanks" - reviewed 16/05/23, REECYRUSSO
From £87,392
Need an Extension Builder in AL9? Samuele Paolini has been helping local clients (5 mile radius) with their extension buildering jobs for many yea...
From £87,280
Trusted and professional extension builder in AL9. Experienced in all extension buildering work and keeping within budget and on quote. DC Build & ...
From £87,312
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £87,152
I am a qualified, builder, electrician and plumber. I have been working in the construction industry for over 23 years and have built everything fr...
From £87,304
Hi we have 15 years of experience in building and construction industry our specialization is bathrooms and renovations please have a look at the w...
From £87,424
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £87,312
Local Boiler Plumbing & Heating Services is an established and experienced local extension builder in AL9. Please contact us for a free, no obligat...
From £86,920
NISUP BUILDING SERVICES Company specializes in the domestic and commercial building industry :1. Refurbishm...
From £87,432
Krystian Wojasiewicz is a trusted extension builder serving customers in AL9 and the surrounding area. Contact us to today to get a competitive quo...

Building a granny annexe ranges from £86,920 (Nisup Building Services based in HA8) to £87,432 (Krystian Wojasiewicz based in HA9), 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 AL9 by posting a job with HaMuch. We will send it to extension builders in AL9 who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Hatfield | £64 | £283 |
| Granny Annexe near Potters Bar | £43 | £273 |
| Granny Annexe near Welwyn Garden City | £42 | £268 |
| Granny Annexe near St Albans | £63 | £288 |
| Granny Annexe near Cheshunt | £48 | £285 |
| Granny Annexe near Hertford | £46 | £289 |
| Granny Annexe near High Barnet | £43 | £272 |
| Granny Annexe near Borehamwood | £42 | £270 |
| Granny Annexe near Harpenden | £86 | £315 |
| Granny Annexe near Hoddesdon | £46 | £296 |
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 - £17,772

Two storey extension - £88,408

Build a timber frame extension - £26,272

Build a swimming pool - £81,272

Single storey extension - £60,440

Side return extension - £44,560

Install an RSJ - £2,472

Outbuilding - £10,272

Build a Mansard loft conversion - £52,272

Loft conversion - £36,300

Build a kitchen extension - £42,272

Hip to gable loft conversion - £42,272

Granny annexe - £87,272

Garden office - £10,272

Convert a Garage - £16,272

Garage - £18,772

Build a flat roof extension - £22,272

Build a dormer loft conversion - £42,272

Concrete foundations - £6,522

Convert a bungalow loft - £29,272

Convert a basement - £40,560