In short: An HMO extension adds space to a shared house, usually a ground-floor bedroom with ensuite or a bigger communal kitchen. In County Armagh we survey first, price each item separately and hand over the certificates and photos a council asks for.
- Nation
- Northern Ireland
- Pricing region
- Northern Ireland
- Postcode areas
- BT
- Main towns
- Craigavon, Portadown, Newry, Armagh
What do extensions for extra rooms in County Armagh involve?
- Building control completion
- Party wall coordination where needed
- Fire separation and detection extended to the new space
- Heating, insulation and glazing
- Foundations, structure and roof
- Kitchen or bedroom fit-out
Which rules apply in County Armagh?
- 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.
- Doors on protected routes are typically FD30 or FD30S, self-closing on three hinges; emergency lighting is required in HMOs of 4 or more storeys.
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 extensions for extra rooms cost in County Armagh?
| 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 |
Typical time on site: 8–14 weeks. For a figure for your house, try the guide-price tool.
Extensions for extra rooms by town in County Armagh
Questions about extensions for extra rooms in County Armagh
Will the extension affect neighbours?
Possibly, if it is on or near a boundary. Party wall procedures may apply in England and Wales.
Can I extend an HMO under permitted development?
Some extensions to houses are permitted development, but rules differ for HMOs and by nation and council. We check the address before design.
Do you carry out extensions for extra rooms across County Armagh?
Yes, across the whole of County Armagh, including Craigavon, Portadown, Newry.
Who licenses HMOs in County Armagh?
HMO licensing in County Armagh, 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 Armagh
- Loft conversions for extra rooms in County Armagh
- Communal kitchen refits in County Armagh
- Layout changes and room reconfiguration in County Armagh
- Large HMO conversions (7+ sharers) in County Armagh
- Ensuite installation in County Armagh
- House to HMO conversion in County Armagh
- Escape routes, emergency lighting and fire stopping in County Armagh
- Rewires and EICR remedials in County Armagh