Build additional living space on your property in PO20

A granny annexe is the ideal solution for offering a young family member their own space in your home while they save up for their own house, or to help an older relative have some independence while keeping them at a safe distance. But how much do they cost to build in PO20?

Granny annexe cost in PO20 - Sort by rates or availability

R&B Property Improvements

From £88,096

(last active 01/10/26)

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.

SBS Building Services

From £87,144

(last active 28/09/26)

We are a small family run business with over 20 years experience in brickwork, bathroom/kitchen fitting, roofing, landscaping, fencing, tiling and ...

H P Building Services Sussex

From £86,992

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...

Futureways Design and Build

From £87,112

(last active 19/09/26)

Location

, BN18

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...

Park Building Services Ltd

From £86,752

(last active 19/09/26)

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...

Main Construction

From £87,440

(last active 19/09/26)

Need to find an Extension Builder near you for all your extension buildering work?

Main Construction provides a local, trusted extension bu...

Alan Pacy Builder

From £87,200

(last active 18/09/26)

Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

GD Project Management Ltd

From £87,376

(last active 18/09/26)

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...

Regent Property Holdings Ltd

From £87,128

(last active 18/09/26)

Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

Stretch My Home Ltd

From £86,880

(last active 18/09/26)

Trusted and professional extension builder in PO20. Experienced in all extension buildering work and keeping within budget and on quote. Stretch My...

Granny Annexe Cost in PO20

Estimates for granny annexe near PO20

Building a granny annexe ranges from £86,752 (Park Building Services Ltd based in PO9) to £88,096 (R&B Property Improvements based in PO9), 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 PO20 by posting a job with HaMuch. We will send it to extension builders in PO20 who will be happy to help you.


Get extension builder rates instantly

Get extension builder rates instantly (excluding VAT or callout charges)
Location in UKHourly RateDaily Rate
Granny Annexe near Chichester£34£242
Granny Annexe near Bognor Regis£35£247
Granny Annexe near Arun£35£241
Granny Annexe near Havant & Waterloo£35£248
Granny Annexe near Havant£35£249
Granny Annexe near Littlehampton£35£244
Granny Annexe near Rustington£36£246
Granny Annexe near Waterlooville£36£250
Granny Annexe near Horndean£35£253
Granny Annexe near Portsmouth£36£250

Estimates for common extension builder jobs in PO20;

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.

More extensions & conversions cost guides...