From £10,008
Whites Carpentry & Building prides in delivering an excellent extension buildering service and value for money in Sidlesham and the surrounding are...
From £11,096
We are a Small Family run business with over 30 years experience in the building trade, Carpentry is my main trade, with NVQ Level 2.
From £10,144
We are a small family run business with over 20 years experience in brickwork, bathroom/kitchen fitting, roofing, landscaping, fencing, tiling and ...
From £9,992
Member since August 2026
H P Building Services Sussex is a one-stop solution for all your extension buildering needs. Establish over 10 years ago and covering 20 miles arou...
From £10,112
Futureways Design and Build are here to help customers who need an Extension Builder in Sidlesham. We offer a competitive rate to complete all your...
From £9,752
Park Building Services Ltd is a trusted extension builder serving customers in Sidlesham and the surrounding area. Contact us to today to get a com...
From £10,440
Need to find an Extension Builder near you for all your extension buildering work?
Main Construction provides a local, trusted extension bu...
From £10,200
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £10,376
Giles Dixon is an experienced Project Manager with over 30 years experience, having worked from the ground up starting in 1984 as an apprentice ele...
From £10,128
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

Garden offices range from the cheapest of £9,752 (Park Building Services Ltd based in PO9) to the dearest of £11,096 (R&B Property Improvements based in PO9), but these are only estimates.
The best way to compare costs is to get actual quotes.
Get rates and quotes to build a garden office in Sidlesham by posting a job with HaMuch. We'll send it to extension builders in Sidlesham.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Garden Office near Chichester | £34 | £242 |
| Garden Office near Bognor Regis | £35 | £247 |
| Garden Office near Arun | £35 | £241 |
| Garden Office near Havant & Waterloo | £35 | £248 |
| Garden Office near Havant | £35 | £249 |
| Garden Office near Littlehampton | £35 | £244 |
| Garden Office near Rustington | £36 | £246 |
| Garden Office near Waterlooville | £36 | £250 |
| Garden Office near Horndean | £35 | £253 |
| Garden Office near Portsmouth | £36 | £250 |
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 - £17,725

Two storey extension - £88,337

Build a timber frame extension - £26,225

Build a swimming pool - £81,225

Single storey extension - £59,496

Side return extension - £44,029

Install an RSJ - £2,425

Outbuilding - £10,225

Build a Mansard loft conversion - £52,225

Loft conversion - £35,858

Build a kitchen extension - £42,225

Hip to gable loft conversion - £42,225

Granny annexe - £87,225

Garden office - £10,225

Convert a Garage - £16,225

Garage - £18,725

Build a flat roof extension - £22,225

Build a dormer loft conversion - £42,225

Concrete foundations - £6,475

Convert a bungalow loft - £29,225

Convert a basement - £40,029