From £86,872
Experienced extension builder ready to quote for your work. Isc Building And Maintenance is the best extension builder in Waltham Cross. No obligat...
From £86,896
Experienced extension builder ready to quote for your work. MERT BUILDERS is the best extension builder in Waltham Cross. No obligation free quotes...
From £87,344
Roberts & Co is a family run business est.2009. We specialize in Kitchen extensions and Loft conversions, and cover Hertfordshire, Essex and Greate...
From £87,192
Trusted and professional extension builder in Waltham Cross. Experienced in all extension buildering work and keeping within budget and on quote. J...
From £87,384
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £87,336
Experienced extension builder ready to quote for your work. SBH Construction Group is the best extension builder in Waltham Cross. No obligation fr...
From £87,264
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £87,392
Trusted and professional extension builder in Waltham Cross. Experienced in all extension buildering work and keeping within budget and on quote. Q...
From £87,272
Herts Renovations is a trusted extension builder serving customers in Waltham Cross and the surrounding area. Contact us to today to get a competit...
From £87,144
Trusted and professional extension builder in Waltham Cross. Experienced in all extension buildering work and keeping within budget and on quote. P...

Building a granny annexe ranges from £86,872 (Isc Building And Maintenance based in EN8) to £87,392 (QUAD BUILDING SERVICES based in EN8), 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 Waltham Cross by posting a job with HaMuch. We will send it to extension builders in Waltham Cross who will be happy to help you.
"Granny annexe" - EN3, job posted 03/08/25
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Cheshunt | £48 | £285 |
| Granny Annexe near Epping Forest | £44 | £273 |
| Granny Annexe near Hoddesdon | £46 | £296 |
| Granny Annexe near Loughton | £44 | £273 |
| Granny Annexe near Potters Bar | £43 | £273 |
| Granny Annexe near High Barnet | £43 | £272 |
| Granny Annexe near Walthamstow | £45 | £277 |
| Granny Annexe near Hertford | £46 | £289 |
| Granny Annexe near Ware | £47 | £296 |
| Granny Annexe near Muswell Hill | £44 | £273 |
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 - £17,710

Two storey extension - £88,314

Build a timber frame extension - £26,210

Build a swimming pool - £81,210

Single storey extension - £59,192

Side return extension - £43,858

Install an RSJ - £2,410

Outbuilding - £10,210

Build a Mansard loft conversion - £52,210

Loft conversion - £35,715

Build a kitchen extension - £42,210

Hip to gable loft conversion - £42,210

Granny annexe - £87,210

Garden office - £10,210

Convert a Garage - £16,210

Garage - £18,710

Build a flat roof extension - £22,210

Build a dormer loft conversion - £42,210

Concrete foundations - £6,460

Convert a bungalow loft - £29,210

Convert a basement - £39,858