In short: An HMO extension adds space to a shared house, usually a ground-floor bedroom with ensuite or a bigger communal kitchen. We carry this out across Na h-Eileanan Siar, priced against the HMO rules for Scotland and the council’s own standards.
- Nation
- Scotland
- Pricing region
- Scotland
- Postcode areas
- HS, PA
- Main towns
- Isle of Lewis
What do extensions for extra rooms in Na h-Eileanan Siar involve?
- Foundations, structure and roof
- Heating, insulation and glazing
- Fire separation and detection extended to the new space
- Party wall coordination where needed
- Planning route check and drawings
- Building control completion
Which rules apply in Na h-Eileanan Siar?
- Scotland has no C4 use class: up to 5 residents can fall within Class 9 (houses), and HMO planning policy is set by each council, some of which require permission at lower numbers.
- A building warrant may be needed for a change of use or for installing a fire alarm system; check with the council’s building standards service.
- Councils set HMO fire standards through licence conditions, often including emergency lighting in larger HMOs.
- Kitchen, WC and bathroom ratios come from council standards; one WC and one bath or shower per 5 people is a common figure.
Scottish councils set their own HMO licence standards and planning policies. Every HMO needs a licence, so check the council’s standards before you design the layout.
How much do extensions for extra rooms cost in Na h-Eileanan Siar?
| Item | UK typical | Local guide | Per |
|---|---|---|---|
| Single-storey extension, about 15 m² | £35,000 – £60,000 | £33,250 – £57,000 | project |
| Single-storey extension per m² | £1,800 – £4,000 | £1,700 – £3,800 | 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 Na h-Eileanan Siar
Questions about extensions for extra rooms in Na h-Eileanan Siar
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 Na h-Eileanan Siar?
Yes, across the whole of Na h-Eileanan Siar, including Isle of Lewis.
Who licenses HMOs in Na h-Eileanan Siar?
Na h-Eileanan Siar council licenses HMOs in its area. Every HMO in Scotland needs a licence.
Other HMO services in Na h-Eileanan Siar
- Loft conversions for extra rooms in Na h-Eileanan Siar
- Communal kitchen refits in Na h-Eileanan Siar
- Layout changes and room reconfiguration in Na h-Eileanan Siar
- Large HMO conversions (7+ sharers) in Na h-Eileanan Siar
- Ensuite installation in Na h-Eileanan Siar
- House to HMO conversion in Na h-Eileanan Siar
- EPC and energy upgrades in Na h-Eileanan Siar
- Fire alarm and detection systems in Na h-Eileanan Siar