An HMO extension adds space to a shared house, usually a ground-floor bedroom with ensuite or a bigger communal kitchen. For a house in Larne we start with a measured survey, check the NI HMO standards and licence conditions for the number of sharers, and then price each item separately.
- Area
- County Antrim, Northern Ireland
- Postcodes
- BT40
- Location
- 18 miles north of Belfast
- Pricing region
- Northern Ireland
What do extensions for extra rooms in Larne involve?
- Kitchen or bedroom fit-out
- Ensuite drainage and extraction
- Foundations, structure and roof
- Planning route check and drawings
- Building control completion
Which rules apply in Larne?
The rules below are the Northern Ireland-wide position for this kind of work. The NI HMO Unit’s standards and licence conditions apply on top, so we always check the address in Larne before we price.
- All new HMOs need planning permission; councils such as Belfast apply HMO policy areas and limits on concentration.
- New HMOs need building control approval as well as planning permission.
- The NIFRS HMO Fire Safety Guide (July 2026) usually expects Grade D1 interlinked detection in smaller shared houses and a Grade A system with more than 6 occupants or over 200 m².
- Kitchens, bathrooms and WCs must meet the 2019 living accommodation standard regulations and licence conditions.
How much do extensions for extra rooms cost in Larne?
| Item | UK typical | Local guide | Per |
|---|---|---|---|
| Single-storey extension, about 15 m² | £35,000 – £60,000 | £31,500 – £54,000 | project |
| Single-storey extension per m² | £1,800 – £4,000 | £1,600 – £3,600 | m² |
These are typical ranges including VAT, adjusted for Northern Ireland, where costs run below the UK average. The fixed price for a house in Larne follows a site visit.
How long does it take?
Typical time on site: 8–14 weeks. We agree the programme with you before starting and send photo updates as the work progresses.
When do Larne landlords need it?
We usually get the call when:
- Moving to more sharers with consent
- Adding a ground-floor room
Questions about extensions for extra rooms in Larne
Is a kitchen extension worth it?
Often, when the existing kitchen limits how many people the council will allow. A bigger kitchen can unlock an extra room.
Which postcodes in Larne do you work in?
All of them, including BT40, and the surrounding parts of County Antrim.
Does a shared house in Larne need an HMO licence?
Yes, if 3 or more people forming more than two households live there as their main home and pay rent. Licensing for every council in Northern Ireland is run by the NI HMO Unit at Belfast City Council.
How much do extensions for extra rooms cost in Larne?
Our guide ranges for Northern Ireland are in the table on this page, and the guide-price tool gives a figure for your house. A fixed written quote follows a free site visit.
Extensions for extra rooms near Larne
- Carrickfergus · 9 mi
- Newtownabbey · 14 mi
- Bangor (County Down) · 14 mi
- Holywood · 15 mi
- Dundonald · 18 mi
- Belfast · 18 mi
- All of County Antrim