What is a wraparound extension?
A wraparound extension combines a side return and a rear extension into one L-shaped addition. It gives the largest possible ground floor, often creating an open-plan kitchen, dining and living space across the whole width of the house.
How much does a wraparound extension cost in Antrim?
In Antrim, a wraparound extension typically costs £1,900–£2,750 per m² of floor area, including VAT at 20% (standard rate). For a typical 28 m² project that is roughly £53,000–£77,000. Building costs in Northern Ireland run about 14% below the UK average, and the figures for Antrim are adjusted to reflect that. Design, structural calculations and council fees are extra.
| Size or type | Guide range |
|---|---|
| Smaller project (20 m²) | £38,000–£55,000 |
| Typical project (28 m²) | £53,000–£77,000 |
| Larger project (39 m²) | £74,000–£107,000 |
| Rate per m² | £1,900–£2,750 |
What moves the price most:
- Kitchen and flooring specification
- Steelwork and propping of the existing house
- Agreements with neighbours on shared walls
- Access for materials on terraced streets
Use the guide price tool to see how size and specification change the figure, then ask for a written, itemised quote.
Do you need planning permission for a wraparound extension in Antrim?
Here is how the rules work for a wraparound extension in Northern Ireland. In Northern Ireland a wraparound extension normally needs planning permission and building control approval.
Northern Ireland has no Party Wall Act. Work on shared walls relies on agreement with the neighbour and common law, so we agree the arrangements in writing before work starts.
Our first visit includes a check of your planning history, so you know the route before paying for drawings.
What we handle
From survey to sign-off, the job normally involves:
- Walls, roof and glazing
- Design and planning application
- Foundations and drainage
- Underfloor heating option, electrics and plastering
- Building control completion
- Structural engineer’s design for steels and supports
How long does it take?
Expect 12 to 18 weeks on site. Before that, surveys, drawings and approvals usually take 3 to 4 months, longer if the council asks for changes.
Building in Antrim
Northern Ireland has many detached and semi-detached homes on generous plots, which suits single-storey rear extensions and garage conversions.
From BT41 outwards, we take on projects throughout Antrim and the surrounding parts of County Antrim.
How it works
- 01
Survey and brief
We visit, discuss your ideas and budget, and survey the property or site at no cost.
- 02
Design and fixed quote
Drawings, structural calculations and an itemised, fixed price for the agreed specification.
- 03
Approvals in place
We handle planning, building control and neighbour notices before work starts.
- 04
Build and handover
Work follows the agreed programme, with inspections along the way and a completion certificate at the end.
Questions about wraparound extensions in Antrim
How much does a wraparound extension cost in Antrim?
In Antrim, a wraparound extension typically costs £1,900–£2,750 per m² of floor area, including VAT at 20% (standard rate). A typical 28 m² project comes to roughly £53,000–£77,000. Your fixed price depends on the survey and drawings.
What about the old back addition?
The side wall of the back addition is usually removed and replaced with a steel beam, so the old kitchen joins the new space.
Do you build wraparound extensions in Antrim?
Yes. We build wraparound extensions across Antrim, including postcodes BT41. Every project starts with a free home visit.
Do I need planning permission for a wraparound extension in Antrim?
In Northern Ireland a wraparound extension normally needs planning permission and building control approval.
Is a wraparound worth it?
It gives the biggest ground-floor space without going upwards. Whether it adds value depends on your street and house, so we suggest checking local sale prices before committing.
Can we keep a separate living room?
Yes. Many clients keep the front room separate and open up only the back of the house.