- Nation
- Northern Ireland
- Pricing region
- Northern Ireland
- Postcode areas
- BT
- Main towns
- Londonderry County Borough, Derry, Coleraine
What do loft conversions for extra rooms in County Londonderry involve?
- Structural design and steelwork
- Feasibility and head-height check
- Planning or permitted development check
- Fire doors and extended alarm system
- Ensuite where space allows
- Dormer or roof windows
Which rules apply in County Londonderry?
- 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.
- Space and amenity standards come from the HMO (Living Accommodation Standard) Regulations (NI) 2019 and the licence conditions.
- Licences usually last 5 years, and landlords must also register with the NI landlord registration scheme.
In Northern Ireland, licensing is run centrally by the NI HMO Unit, and all new HMOs need planning permission and building control approval from the local council.
How much do loft conversions for extra rooms cost in County Londonderry?
| Item | UK typical | Local guide | Per |
|---|---|---|---|
| Dormer loft conversion, about 30 m² | £40,000 – £60,000 | £36,000 – £54,000 | project |
| Rooflight loft conversion, about 30 m² | £22,500 – £30,000 | £20,250 – £27,000 | project |
Typical time on site: 6–10 weeks. For a figure for your house, try the guide-price tool.
Loft conversions for extra rooms by town in County Londonderry
Questions about loft conversions for extra rooms in County Londonderry
Does a loft room need a fire escape window?
In an HMO the main protection is usually a protected stair and fire doors. The building regulations and fire strategy decide the detail.
How much head height do I need?
As a rule of thumb, about 2.2 metres at the highest point of the existing roof space before any work. Less can work with a dormer or lowered ceilings.
Do you carry out loft conversions for extra rooms across County Londonderry?
Yes, across the whole of County Londonderry, including Londonderry County Borough, Derry, Coleraine.
Who licenses HMOs in County Londonderry?
HMO licensing in County Londonderry, as everywhere in Northern Ireland, is run by the NI HMO Unit at Belfast City Council. Planning and building control are handled by the local council.
Other HMO services in County Londonderry
- Extensions for extra rooms in County Londonderry
- Large HMO conversions (7+ sharers) in County Londonderry
- Escape routes, emergency lighting and fire stopping in County Londonderry
- Ensuite installation in County Londonderry
- Layout changes and room reconfiguration in County Londonderry
- Fire alarm and detection systems in County Londonderry
- Rewires and EICR remedials in County Londonderry
- Fire doors in County Londonderry