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Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
S ROBERTS ROOFING are here to help customers who need an Extension Builder in St Asaph. We offer a competitive rate to complete all your extension ...
Robert Wilson
Wood floor services is a trusted extension builder serving customers in St Asaph and the surrounding area. Contact us to today to get a competitiv...
From £86,416
John Foster
Octagon Construction Ltd is a trusted extension builder serving customers in St Asaph and the surrounding area. Contact us to today to get a compet...
From £86,448
Shaun Davies
We are a company with over 30 years of experience. Who pride ourselves by providing a honest reliable service

Building a granny annexe ranges from £86,416 (Octagon Construction Ltd based in LL18) to £86,872 (Brothers Construction based in LL18), 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 St Asaph by posting a job with HaMuch. We will send it to extension builders in St Asaph who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Rhyl | £28 | £209 |
| Granny Annexe near Prestatyn | £29 | £213 |
| Granny Annexe near Colwyn Bay | £28 | £211 |
| Granny Annexe near Flintshire | £33 | £224 |
| Granny Annexe near Heswall | £30 | £213 |
| Granny Annexe near Connah's Quay | £33 | £229 |
| Granny Annexe near Llandudno | £28 | £211 |
| Granny Annexe near Conway | £28 | £211 |
| Granny Annexe near Conwy | £28 | £211 |
| Granny Annexe near Wirral | £31 | £219 |
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 - £17,105

Two storey extension - £87,407

Build a timber frame extension - £25,605

Build a swimming pool - £80,605

Single storey extension - £47,096

Side return extension - £37,054

Install an RSJ - £1,805

Outbuilding - £9,605

Build a Mansard loft conversion - £51,605

Loft conversion - £30,045

Build a kitchen extension - £41,605

Hip to gable loft conversion - £41,605

Granny annexe - £86,605

Garden office - £9,605

Convert a Garage - £15,605

Garage - £18,105

Build a flat roof extension - £21,605

Build a dormer loft conversion - £41,605

Concrete foundations - £5,855

Convert a bungalow loft - £28,605

Convert a basement - £33,054