In short: An HMO extension adds space to a shared house, usually a ground-floor bedroom with ensuite or a bigger communal kitchen. In Renfrewshire we survey first, price each item separately and hand over the certificates and photos a council asks for.
- Nation
- Scotland
- Pricing region
- Scotland
- Postcode areas
- PA
- Main towns
- Paisley, Renfrew, Johnstone, Erskine
What do extensions for extra rooms in Renfrewshire involve?
- Fire separation and detection extended to the new space
- Planning route check and drawings
- Ensuite drainage and extraction
- Heating, insulation and glazing
- Foundations, structure and roof
- Party wall coordination where needed
Which rules apply in Renfrewshire?
- 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.
- The tolerable standard requires interlinked smoke alarms in the main living room and circulation spaces and a heat alarm in the kitchen; licensed HMOs must meet the council’s higher standard.
- Kitchen, WC and bathroom ratios come from council standards; one WC and one bath or shower per 5 people is a common figure.
- Councils set HMO fire standards through licence conditions, often including emergency lighting in larger HMOs.
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 Renfrewshire?
| 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 Renfrewshire
Questions about extensions for extra rooms in Renfrewshire
Do you handle building control?
Yes, from application to completion certificate.
Will the extension affect neighbours?
Possibly, if it is on or near a boundary. Party wall procedures may apply in England and Wales.
Do you carry out extensions for extra rooms across Renfrewshire?
Yes, across the whole of Renfrewshire, including Paisley, Renfrew, Johnstone.
Who licenses HMOs in Renfrewshire?
Renfrewshire council licenses HMOs in its area. Every HMO in Scotland needs a licence.
Other HMO services in Renfrewshire
- Loft conversions for extra rooms in Renfrewshire
- Communal kitchen refits in Renfrewshire
- Layout changes and room reconfiguration in Renfrewshire
- Large HMO conversions (7+ sharers) in Renfrewshire
- Ensuite installation in Renfrewshire
- House to HMO conversion in Renfrewshire
- Rewires and EICR remedials in Renfrewshire
- Professional and co-living HMO refurbs in Renfrewshire