Cost of Single Storey Extension in Ballymena (2026)
A typical single storey extension job in Ballymena costs £1,405 at the budget end and £2,495 for a full-spec install, per m². Outside peak season you'll usually get booked in within three to four weeks; summer runs tighter.
About single storey extension in Ballymena
Ballymena is a small town of around 30,000 in Antrim. The housing is mostly a mix of stone-built period cottages, post-war council housing and small new-build estates typical of Celtic-fringe market towns. That matters: older properties usually mean more pipework, rewiring and retrofit surprises, while newer builds in districts like BT42, BT43 tend to be quicker jobs with standardised fittings. Local trade prices sit below the UK average. Lower contractor overheads and shorter distances across Antrim do most of the work.
Northern Ireland is typically the cheapest part of the UK for trade services, usually 15 to 20 percent under the national average. Gas Safe and NICEIC operate in NI; a few English schemes don't. Most material supply comes out of Belfast and Lisburn, so rural Fermanagh and Tyrone jobs can wait a day or two on parts.
Building jobs are labour-heavy, and materials have moved fast — brick, timber, steel, insulation and board are all 20 to 40 percent up on pre-2022. FMB and TrustMark are your best signposts for a proper builder. On anything bigger than a loft conversion, get a Building Control officer involved from day one; fixing non-compliance later costs a fortune.
Single Storey Extension cost breakdown in Ballymena
Simple rear extension with standard finish
Open-plan kitchen extension with bi-fold doors
Wrap-around or glazed extension with lantern roof and structural steels
What affects the price of single storey extension in Ballymena?
- Ground conditions and foundation depth
- Glazing ratio (bi-folds, roof lights)
- Kitchen refit included
- Structural steels and knock-through
- Planning permission vs PD
Ballymena vs the UK average
Ballymena sits in the building & construction market at a cost multiplier of 0.78× the UK national average. That puts Ballymena single storey extension prices at £1,405–£2,495 versus the UK average of £1,800–£3,200 per m².
Single Storey Extension cost calculator — Ballymena
Estimate based on live 2025 UK trade pricing. Always get 3 written quotes before committing.
Get 3 free quotes from local single storey extension specialists in Ballymena
Compare prices from vetted, trade-body-certified professionals near Ballymena (BT42, BT43). No obligation, takes about 2 minutes.
Get my free quotes- No obligation
- Takes 2 minutes
- Vetted tradespeople
- Insurance-backed
What's typically included in a single storey extension quote
- Foundations and drainage
- Brick and block shell
- Roof and glazing
- First and second fix
- Plaster and decoration
Frequently asked questions
How much does single storey extension cost in Ballymena?
Budget £1,405 to £2,495 per m² for single storey extension in Ballymena. Prices here are around 22% cheaper than the UK average. What moves a quote inside that range is mostly building contractor day rates in Antrim and the specific material list for your job.
How long does single storey extension take in Ballymena?
A straightforward single storey extension job in Ballymena runs to 10–16 weeks. You can lose days to things outside the contractor's control — parts on backorder, awkward access, or a firm slotting your job around existing bookings. Ask for a start date and expected finish up front.
What's included in the price of single storey extension in Ballymena?
A proper single storey extension quote in Ballymena should cover: Foundations and drainage; Brick and block shell; Roof and glazing; First and second fix; Plaster and decoration. If any of those aren't itemised on your quote, push back and ask. A written guarantee with a clear warranty period is reasonable to expect on this kind of work.
Is single storey extension cheaper in Ballymena than the UK average?
Single Storey Extension in Ballymena runs around 22% cheaper than the UK average. The UK-wide benchmark for this job is £1,800 to £3,200 per m²; Ballymena quotes tend to land between £1,405 and £2,495. Handy to know what the average actually looks like before you price round.
Do I need planning permission for single storey extension in Ballymena?
Most rear extensions fall under Permitted Development (up to 6m terraced/8m detached with Prior Approval). Side extensions and Article 4 areas require full planning. If the property sits in a conservation area or is listed, ring Antrim Council before you book anything in. It's a free call and saves a world of grief later.
See all single storey extension prices across the UK or browse all tradespeople costs in Ballymena.