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Select your affordable Holywood extension builder
Relax... you have found a reliable extension builder in Holywood. SM Plumbing & Heating is a friendly and reliable company based in Holywood who co...
From £21,296
Ballantine building solutions is an established extension buildering business in Holywood. We come highly recommended and provide competitive quote...
From £21,384
Designco Ltd is an established extension buildering business in Holywood. We come highly recommended and provide competitive quotes for your work.<...
From £21,264
Trusted and professional extension builder in Holywood. Experienced in all extension buildering work and keeping within budget and on quote. DGA ha...
From £21,376
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £21,176
Trusted and professional extension builder in Holywood. Experienced in all extension buildering work and keeping within budget and on quote. Extend...

A flat roof extension ranges from the cheapest of £21,176 (Extended living by Gilbert-Ash based in BT12) to the dearest of £21,384 (Designco Ltd based in BT36), but these are just estimates. While they give you an idea of who will be better value, the best way to compare costs is to get real quotes.
Find out how much your flat roof extension will cost in Holywood by posting a job with HaMuch. We'll send it to extension builders in Holywood.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Flat Roof Extension near Holywood | £23 | £159 |
| Build A Flat Roof Extension near Greenisland | £23 | £153 |
| Build A Flat Roof Extension near Belfast | £23 | £161 |
| Build A Flat Roof Extension near Carrickfergus | £23 | £158 |
| Build A Flat Roof Extension near Bangor | £24 | £183 |
| Build A Flat Roof Extension near Bangor | £24 | £183 |
| Build A Flat Roof Extension near Ballygowan | £24 | £183 |
| Build A Flat Roof Extension near Comber | £22 | £160 |
| Build A Flat Roof Extension near Carryduff | £23 | £158 |
| Build A Flat Roof Extension near Ballyclare | £20 | £124 |
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 - £16,811

Two storey extension - £86,966

Build a timber frame extension - £25,311

Build a swimming pool - £80,311

Single storey extension - £41,213

Side return extension - £33,745

Install an RSJ - £1,511

Outbuilding - £9,311

Build a Mansard loft conversion - £51,311

Loft conversion - £27,288

Build a kitchen extension - £41,311

Hip to gable loft conversion - £41,311

Granny annexe - £86,311

Garden office - £9,311

Convert a Garage - £15,311

Garage - £17,811

Build a flat roof extension - £21,311

Build a dormer loft conversion - £41,311

Concrete foundations - £5,561

Convert a bungalow loft - £28,311

Convert a basement - £29,745