From £87,024
House Construction ltd is a trusted extension builder serving customers in BN1 and the surrounding area. Contact us to today to get a competitive q...
From £87,008
Business CategoriesBathroom Planners and Furnishers, Builders, Building Services, Cabinet Makers, Decking, Flooring Services, Home Improvem...
From £86,856
Orchard Timberworks is a Brighton based Carpentry and Joinery business, located in the beautiful South Downs. We specialise in custom Carpentry and...
From £87,128
Build Safe Ltd is an established and experienced local extension builder in BN1. Please contact us for a free, no obligation quote and competitive ...
From £87,072
Relax... you have found a reliable extension builder in BN1. R & G Construction Brighton Ltd is a friendly and reliable company based in BN1 who co...
From £86,696
Trusted and professional extension builder in BN1. Experienced in all work and keeping within budget and on quote. Construct Brighton have many ha...
From £86,832
Need to find an Extension Builder near you for all your work?
Bright Green Homes LLP provides a local, trusted service in and around BN1....
From £86,840
The studio is based on our founder's vision in concept and interior design, Fabio Lauro has long been in the business of creating atmospheres. His ...
From £86,864
Brightspace Renovations is an established business in BN1. We come highly recommended and provide competitive quotes for your work.
From £87,080
We are a small, professional and friendly team of Interior Designers and Project Managers working in Brighton, London, Sussex and the South East. W...

Building a granny annexe ranges from £86,696 (Construct Brighton based in BN1) to £87,128 (Build Safe Ltd based in BN1), 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 BN1 by posting a job with HaMuch. We will send it to extension builders in BN1 who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Brighton and Hove | £30 | £219 |
| Granny Annexe near Brighton | £30 | £219 |
| Granny Annexe near Shoreham-by-Sea | £31 | £217 |
| Granny Annexe near Burgess Hill | £31 | £208 |
| Granny Annexe near Lancing | £32 | £219 |
| Granny Annexe near Worthing | £31 | £222 |
| Granny Annexe near Haywards Heath | £30 | £222 |
| Granny Annexe near Seaford | £30 | £214 |
| Granny Annexe near Mid Sussex | £30 | £224 |
| Granny Annexe near Rustington | £32 | £220 |
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 - £17,440

Two storey extension - £87,910

Build a timber frame extension - £25,940

Build a swimming pool - £80,940

Single storey extension - £53,800

Side return extension - £40,825

Install an RSJ - £2,140

Outbuilding - £9,940

Build a Mansard loft conversion - £51,940

Loft conversion - £33,188

Build a kitchen extension - £41,940

Hip to gable loft conversion - £41,940

Granny annexe - £86,940

Garden office - £9,940

Convert a Garage - £15,940

Garage - £18,440

Build a flat roof extension - £21,940

Build a dormer loft conversion - £41,940

Concrete foundations - £6,190

Convert a bungalow loft - £28,940

Convert a basement - £36,825