In short: An HMO loft conversion adds one or two letting rooms, often with an ensuite, in the roof space. We carry this out across Wiltshire, priced against the HMO rules for England and the council’s own standards.
- Nation
- England
- Pricing region
- South West
- Postcode areas
- SN, SP, BA, RG
- Main towns
- Swindon, Salisbury, Trowbridge, Chippenham
What do loft conversions for extra rooms in Wiltshire involve?
- Planning or permitted development check
- New stair within the protected route
- Feasibility and head-height check
- Structural design and steelwork
- Building control sign-off
- Ensuite where space allows
Which rules apply in Wiltshire?
- 7 or more sharers is a sui generis large HMO and normally needs planning permission.
- A conversion can be a material change of use under the building regulations, so confirm with building control before work starts.
- The Fire Safety Order 2005 applies to the common parts of HMOs, enforced by the fire and rescue authority.
- Floor area under a ceiling lower than 1.5 m does not count towards the room size, and many councils set larger sizes.
- Under the Renters’ Rights Act, civil penalties reach £40,000 for offences such as running an unlicensed HMO.
Councils in England can add additional licensing and Article 4 directions on top of the national rules. Check the council’s website for the exact address before you buy or start work.
How much do loft conversions for extra rooms cost in Wiltshire?
| Item | UK typical | Local guide | Per |
|---|---|---|---|
| Dormer loft conversion, about 30 m² | £40,000 – £60,000 | £41,600 – £62,400 | project |
| Rooflight loft conversion, about 30 m² | £22,500 – £30,000 | £23,400 – £31,200 | 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 Wiltshire
Questions about loft conversions for extra rooms in Wiltshire
Does adding a loft room change the HMO planning position?
It can. Going from six to seven sharers moves a house into a large HMO in England, which normally needs planning permission. We check before design.
Will the loft room count for licensing?
Only the floor area with at least 1.5 metres of headroom counts towards the room size in England.
Do you carry out loft conversions for extra rooms across Wiltshire?
Yes, across the whole of Wiltshire, including Swindon, Salisbury, Trowbridge.
Who licenses HMOs in Wiltshire?
HMOs in Wiltshire are licensed by the local council for the address. Where an area has several councils, each runs its own licensing and planning policies.
Other HMO services in Wiltshire
- Extensions for extra rooms in Wiltshire
- Large HMO conversions (7+ sharers) in Wiltshire
- Escape routes, emergency lighting and fire stopping in Wiltshire
- Ensuite installation in Wiltshire
- Layout changes and room reconfiguration in Wiltshire
- Fire alarm and detection systems in Wiltshire
- Shared bathroom and shower room refits in Wiltshire
- Communal kitchen refits in Wiltshire