Builders in Northern Ireland
33 practices covering Northern Ireland. Listings are business information researched by Renovome; contact details and matching happen inside Workspace.
A•••••• P••
Armagh manufacturer and installer of domestic uPVC windows and doors.
B•••••• W••••••
Lurgan company manufacturing and fitting domestic windows and doors.
D•••• F••••••• C•••••••• &•
Northern Ireland flooring contractor with domestic fitting teams for LVT, carpet and vinyl flooring.
G•••••••• L••••••••
County Down landscaping company undertaking domestic patios, walls, driveways, fencing, lawns and planting, including small jobs.
K• M•••••• E••••••••
Ballycastle electrical contractor undertaking domestic electrical work including additional sockets and wider installations.
P•••• E••••••••
Randalstown electrical contractor undertaking domestic electrical work and one-off projects across Northern Ireland.
R••••••• D••••• N•
Northern Ireland roofline company also installing windows, doors, paving and decking.
S• J• L••••••• &•
County Tyrone family joinery business providing bespoke joinery, doors, windows and flooring products and services.
S••• W•••••••• E•••••••• C••••••••
Northern Ireland electrical contractor providing domestic electrical, fault-finding and call-out services.
S••••• W••••••
Lisburn window and door installer undertaking domestic replacement work.
S•••••••• P••••••• a•• D••••••••
County Tyrone painting and decorating business undertaking domestic interior and exterior jobs of all sizes.
T• T••••• &• P•••••••
County Tyrone trade business providing domestic tiling and plumbing services.
A• H••• I••••••••
Residential building contractor serving Bangor and Northern Ireland.
B••• C••••••••
Residential building contractor serving Derry, Northern Ireland.
C•• I•••••• L••••••
UK residential building contractor delivering home extensions, renovations, refurbishments, conversions or related building work in Newry, Northern Ireland.
C••• &• J••••••• L••
UK residential building contractor delivering home extensions, renovations, refurbishments, conversions or related building work in Bangor, Northern Ireland.
D•• C••••••••
Residential building contractor serving Ballyclare and County Antrim, Northern Ireland.
D••••••• B••• C•••••••• L••
Residential building contractor serving County Tyrone, Northern Ireland.
E••• D••• C••••••••
Residential building contractor serving Portaferry and County Down, Northern Ireland.
G• C•••••••• N• L••
Residential building contractor serving Lisburn, Northern Ireland.
G••••• L••
Residential building contractor serving County Armagh, Northern Ireland.
G••••••• B••••••• L••
Residential building contractor serving Larne and Ballymena, Northern Ireland.
J• J•••••• &• C••••••••
Residential building contractor serving Derry, Northern Ireland.
L•••• C••••••••
Residential building contractor serving Ballymena and County Antrim, Northern Ireland.
L••••••• C••••••••
Residential building contractor serving Maghera, County Derry, Northern Ireland.
M•••• C•••••••• C• L••
Residential building contractor serving Ballymoney and County Antrim, Northern Ireland.
M••••• C•••••••• S•••••••
UK residential building contractor delivering home extensions, renovations, refurbishments, conversions or related building work in Newry, Northern Ireland.
M•••••• C•••••••• L••
Residential building contractor serving Lisburn, Northern Ireland.
M•••••••• M•••••••• &• B•••••••
Residential building contractor serving Newtownards, Northern Ireland.
P•• C••••••••
Residential building contractor serving Antrim, Northern Ireland.
P••••• M••••••• C••••••••
Residential building contractor serving Toomebridge and County Antrim, Northern Ireland.
R• H•••• C••••••••
UK residential building contractor delivering home extensions, renovations, refurbishments, conversions or related building work in Newry, Northern Ireland.
T•• C•••••••• L••
UK residential building contractor delivering home extensions, renovations, refurbishments, conversions or related building work in Lisburn, Northern Ireland.
How to choose a builder in Northern Ireland
You appoint a builder once the scope is defined. If you invite builders before the drawings and specification are settled, every quote prices a different job and you cannot compare them.
- Give every builder the same drawings, specification and programme, then compare line by line.
- Check the company at Companies House, and ask how long the team has worked together.
- Visit a current site, not just a finished photo.
- Ask for public liability insurance and, where relevant, a warranty or guarantee.
- Agree a payment schedule tied to stages completed, never a large payment up front.
What builders in Northern Ireland typically work on
- Single and two-storey extensions
- Loft conversions and garage conversions
- Kitchen and bathroom refits
- Structural openings and knock-throughs
- Whole-house refurbishments
Typical 2026 fees for builders
| Item | Typical 2026 cost |
|---|---|
| Extension shell, per square metre | £2,300 - £3,400 |
| Single-storey rear extension, 20 sq m | £52,000 - £86,000 |
| Loft conversion, rear dormer | £48,000 - £78,000 |
| Structural opening with flush beam | £4,500 - £12,000 |
| Day rate, two-person team | £380 - £620 |
Indicative 2026 UK ranges, not quotations. London and the South East usually sit at the top of each range. Last reviewed: September 2026.
Common questions
- How many builders should I ask to quote?
- Three is enough, provided all three price the same written scope. More quotes on a vague brief produce a wider spread, not better information.
- Why do quotes for the same job differ so much?
- Usually because they include different work. Compare the inclusions, exclusions and provisional sums before you compare the totals.
Read next
Brief several builders at once
Renovome Workspace shortlists suitable practices for your project, sends one consistent brief and lays the responses out side by side so you compare scope, not just price.
Start your project