Carrickfergus, County Antrim
Side return extension in Carrickfergus
Infilling the narrow passage beside a Victorian or Edwardian back addition. We design, get the approvals for and build side return extensions in Carrickfergus and the surrounding area, with one contract from the first survey to building control sign-off.
Carrickfergus and its postcode districts BT38 are part of our County Antrim coverage. Side returns suit the Victorian and Edwardian terraces found across parts of County Antrim, where the kitchen sits in a narrow back addition.
Book a free site visit
Tell us about the house and we'll call to arrange a free, no-obligation visit.
How much does a side return extension cost in Carrickfergus?
A side return extension in Carrickfergus is priced at £2,000–£3,310 per square metre including VAT as a guide, before kitchen fit-out and fees. Northern Ireland prices are the lowest in our range.
| Size | Guide price inc VAT |
|---|---|
| 2 m wide × 6 m deep (12 m²) | £24,000–£39,500 |
| 2.5 m wide × 7 m deep (17.5 m²) | £35,000–£58,000 |
These are guide ranges; the written quote after the survey is the figure that counts.
Do you need planning permission for a side return extension in Carrickfergus?
Planning for a side return extension in Carrickfergus follows the Northern Irish householder rules.
In Northern Ireland side extensions that face a road, or go beyond permitted development limits, need planning permission from the council, and most wraparounds go through a planning application.
Northern Ireland has no Party Wall Act. Shared-wall work relies on agreement with your neighbour and the general law, so we put access and protection arrangements in writing before starting.
Conservation areas, Areas of Outstanding Natural Beauty and listed buildings restrict permitted development in Northern Ireland. We check your house's planning history and any conservation area before drawing, so the route is clear before you spend on plans.
What are homes in Carrickfergus like to extend?
Semis and detached houses are typical of Carrickfergus, and many have room for a rear extension within Northern Ireland's permitted development limits.
How a side return extension in Carrickfergus comes together
Free site visit
We measure the house and garden, look at the back wall, drainage and boundaries, and talk through what you want from the space.
Design and guide price
Two or three layout options with a guide price for each, so you choose the design knowing what it costs.
Approvals
Permitted development check or planning application, then building control drawings to the Northern Ireland Technical Booklets and structural calculations, plus a written agreement with neighbours for any shared-wall work.
Written price, then build
Once the design and approvals are in place, you get a fixed written price and programme, and we build through to sign-off.
Side return extensions near Carrickfergus
We also build side return extensions in nearby Holywood (5.4 miles) and Newtownabbey (5.6 miles).
- Side return extension in Holywood
- Side return extension in Newtownabbey
- Side return extension in Bangor
- Side return extension in Dundonald
- Side return extension in Larne
Other work in Carrickfergus:
FAQ
Side return extension questions in Carrickfergus
Can you match the brick or stone on my Carrickfergus house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.
Will I need a structural engineer?
Yes for the beam over the new opening and usually the foundations; we arrange them and their calculations go to building control.
Glass roof or solid roof with rooflights?
A glass roof gives the most light; a solid roof with long rooflights is warmer and quieter in rain. Both work.
Do I need planning permission for a rear extension in Carrickfergus?
Often not for a single-storey rear extension of up to 3 metres (4 metres detached) under Northern Ireland's permitted development rules, outside conservation areas.
What postcode areas do you cover around Carrickfergus?
Including BT38, and the surrounding County Antrim area.
How much does a side return extension cost in Carrickfergus?
As a guide, £2,000–£3,310 per square metre including VAT for a standard specification. For example, 2 m wide × 6 m deep (12 m²): about £24,000–£39,500 at that rate. Your written price follows the survey.