From £26,008
Whites Carpentry & Building prides in delivering an excellent extension buildering service and value for money in PO20 and the surrounding areas. ...
From £27,096
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 £26,144
We are a small family run business with over 20 years experience in brickwork, bathroom/kitchen fitting, roofing, landscaping, fencing, tiling and ...
From £25,992
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 £26,112
Futureways Design and Build are here to help customers who need an Extension Builder in PO20. We offer a competitive rate to complete all your exte...
From £25,752
Park Building Services Ltd is a trusted extension builder serving customers in PO20 and the surrounding area. Contact us to today to get a competit...
From £26,440
Need to find an Extension Builder near you for all your extension buildering work?
Main Construction provides a local, trusted extension bu...
From £26,200
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £26,376
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 £26,128
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

A timber frame extension built in PO20 typically ranges from £25,752 (Park Building Services Ltd based in PO9) to £27,096 (R&B Property Improvements based in PO9), but this will vary depending on the size of your extension, the design features you'd like and what your soil is like for the foundations.
Comparing extension builders estimates for building a timber frame extension gives you an idea of who will be better value, but the best way to compare costs is to get actual quotes.
Get rates and quotes to build a timber frame extension in PO20 by posting a job with HaMuch and we'll send it to extension builders in PO20.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Timber Frame Extension near Chichester | £34 | £242 |
| Build A Timber Frame Extension near Bognor Regis | £35 | £247 |
| Build A Timber Frame Extension near Arun | £35 | £241 |
| Build A Timber Frame Extension near Havant & Waterloo | £35 | £248 |
| Build A Timber Frame Extension near Havant | £35 | £249 |
| Build A Timber Frame Extension near Littlehampton | £35 | £244 |
| Build A Timber Frame Extension near Rustington | £36 | £246 |
| Build A Timber Frame Extension near Waterlooville | £36 | £250 |
| Build A Timber Frame Extension near Horndean | £35 | £253 |
| Build A Timber Frame Extension 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