Lisburn, County Antrim
Side return extension in Lisburn
For homes in Lisburn, a side return extension is often the simplest way to gain space without moving. Infilling the narrow passage beside a Victorian or Edwardian back addition. We take it from survey to completion certificate.
Lisburn sits in County Antrim, with postcode districts including BT17, BT27 and BT28. Side return projects in Lisburn usually start with a drainage survey of the side passage.
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 Lisburn?
A side return extension in Lisburn 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 |
Ground conditions, glazing, the roof and how far the house is opened up move the final figure within the range.
Do you need planning permission for a side return extension in Lisburn?
The planning route for a side return extension in Lisburn is set by Northern Ireland's householder rules and your council.
Northern Ireland's rules restrict side extensions more than rear ones, so a side infill or wraparound usually needs a planning application to the council as well as building control approval.
There is no Party Wall Act in Northern Ireland; we agree any work affecting a shared wall or boundary directly with the neighbour, in writing.
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 Lisburn like to extend?
Semis and detached houses are typical of Lisburn, and many have room for a rear extension within Northern Ireland's permitted development limits.
How a side return extension in Lisburn comes together
Look round and measure
A free visit to see the back of the house, measure it, check the drains and boundaries and hear what you need.
Drawings and budget
Floor plans and elevations for the options, each with a guide price.
Paperwork handled
Planning or permitted development, building control approval, structural design and neighbour agreements are all handled by us.
Build and sign-off
We build to the approved drawings with regular updates, then hand over the building control completion certificate and any guarantees from suppliers.
Side return extensions near Lisburn
Close by, we work in Belfast, about 6.7 miles away, and Castlereagh, about 7.0 miles away.
- Side return extension in Belfast
- Side return extension in Castlereagh
- Side return extension in Dundonald
- Side return extension in Newtownabbey
- Side return extension in Holywood
Other work in Lisburn:
FAQ
Side return extension questions in Lisburn
Do I need planning permission for a rear extension in Lisburn?
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.
Do I need a party wall agreement?
Northern Ireland has no Party Wall Act; we agree any shared-wall work with your neighbour in writing.
Is a side return permitted development?
Sometimes, as a side extension within the width and height limits, but not in conservation areas, and many terraces are in one.
How much does a side return extension cost in Lisburn?
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.
What postcode areas do you cover around Lisburn?
Including BT17, BT27 and BT28, and the surrounding County Antrim area.
Can I get a price without a visit?
Our online guide-price tool gives a range in a couple of minutes. A written price needs a survey.