In short: A house to HMO conversion turns a single-family home into a house in multiple occupation: a shared home for unrelated people with private bedrooms and shared kitchen or bathroom space. We carry this out across Gwynedd, priced against the HMO rules for Wales and the council’s own standards.
- Nation
- Wales
- Pricing region
- Wales
- Postcode areas
- LL, SY
- Main towns
- Bangor (Gwynedd)
What does house to HMO conversion in Gwynedd involve?
- New stud walls, door openings and room splits
- Layout drawings showing bedrooms, kitchens, bathrooms and the escape route
- A communal kitchen sized for the number of sharers
- Fire doors, fire-rated linings and an interlinked fire alarm
- Decoration, flooring and a handover pack for licensing
- Extra bathrooms, shower rooms or ensuites
Which rules apply in Gwynedd?
- Landlords must register with Rent Smart Wales, and those who manage their own lets need a Rent Smart Wales licence.
- England’s national room sizes do not apply in Wales; councils set their own room standards.
- Kitchen and bathroom ratios are set in each council’s HMO standards.
- More than 6 sharers is a sui generis HMO and needs planning permission; councils such as Cardiff apply concentration limits.
- Building regulations cover structural work, partitions, drainage, fire-resisting construction and electrics; confirm with building control whether the conversion is a material change of use.
Welsh councils set their own HMO standards and may run additional licensing. In Wales, changing a house to a C4 HMO always needs planning permission, so check planning first.
How much does house to HMO conversion cost in Gwynedd?
| Item | UK typical | Local guide | Per |
|---|---|---|---|
| Typical 3–4 bed house to a 5–6 bed HMO, all-in | £30,000 – £75,000 | £28,200 – £70,500 | project |
| Conversion works per letting room (walls, linings, electrics, decoration; excludes kitchens, bathrooms and fire systems; our estimate) | £3,500 – £6,500 | £3,300 – £6,100 | letting room |
| Ensuite shower room added to a bedroom | £4,000 – £10,000 | £3,750 – £9,400 | ensuite |
| Communal HMO kitchen with extra cooking and sink capacity (our estimate from domestic ranges) | £8,000 – £18,000 | £7,500 – £16,900 | kitchen |
| Interlinked mains alarm system (Grade D type), small HMO (our estimate from installer guides) | £800 – £2,000 | £750 – £1,900 | house |
Typical time on site: 6–14 weeks. For a figure for your house, try the guide-price tool.
House to HMO conversion by town in Gwynedd
Questions about house to HMO conversion in Gwynedd
Can you work to a council’s HMO standards document?
Yes. Councils publish their own amenity and space standards. We read the one for your address and work to it, including kitchen and bathroom ratios.
How long does a house to HMO conversion take?
Most conversions of a three or four-bedroom house take six to fourteen weeks on site, after drawings and any approvals. Bigger layout changes, extensions or loft rooms add time.
Do you carry out house to HMO conversion across Gwynedd?
Yes, across the whole of Gwynedd, including Bangor (Gwynedd).
Who licenses HMOs in Gwynedd?
Gwynedd council licenses HMOs in its area. Landlords must also register with Rent Smart Wales.
Other HMO services in Gwynedd
- Small HMO conversions (3–6 sharers) in Gwynedd
- Large HMO conversions (7+ sharers) in Gwynedd
- HMO fire safety upgrades in Gwynedd
- Ensuite installation in Gwynedd
- Communal kitchen refits in Gwynedd
- Layout changes and room reconfiguration in Gwynedd
- EPC and energy upgrades in Gwynedd
- Student HMO refurbishment in Gwynedd