In short: HMO sound insulation reduces noise passing between letting rooms, floors and neighbours. In Cardiff we survey first, price each item separately and hand over the certificates and photos a council asks for.
- Nation
- Wales
- Pricing region
- Wales
- Postcode areas
- CF
- Main towns
- Cardiff, Whitchurch
What does sound insulation in Cardiff involve?
- Sealing of service gaps
- Party wall upgrades
- Acoustic plasterboard
- Pre-completion testing coordination where required
- Acoustic mineral wool
- Acoustic stud walls between rooms
Which rules apply in Cardiff?
- Building regulations sound requirements can apply to conversions and new separating walls and floors.
- 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.
Cardiff Council: local HMO schemes
| Additional licensing | In force in part of the council area Cathays: 1 Feb 2023 to 1 Feb 2028. Plasnewydd had a scheme from 1 Jan 2021; check with Cardiff Council whether it has been renewed. |
|---|---|
| Selective licensing | No scheme found |
Schemes change. Check the council’s current pages for the exact address in Cardiff before you buy or start work. Source: Cardiff Council HMO licensing page, checked 2026-10-31.
How much does sound insulation cost in Cardiff?
| Item | UK typical | Local guide | Per |
|---|---|---|---|
| Acoustic upgrade to a party or partition wall | £900 – £2,000 | £850 – £1,900 | wall |
| Acoustic ceiling or floor upgrade, 12–15 m² | £800 – £2,700 | £750 – £2,550 | room |
Typical time on site: 2–6 working days per room. For a figure for your house, try the guide-price tool.
Sound insulation by town in Cardiff
Questions about sound insulation in Cardiff
Does fire stopping help with sound?
Yes. Sealing gaps around pipes and cables helps both.
Can you soundproof a floor without lifting it?
Often from below, by dropping an independent ceiling with acoustic insulation. It does lower the ceiling slightly.
Do you carry out sound insulation across Cardiff?
Yes, across the whole of Cardiff, including Cardiff, Whitchurch.
Who licenses HMOs in Cardiff?
Cardiff council licenses HMOs in its area. Landlords must also register with Rent Smart Wales.
Other HMO services in Cardiff
- Professional and co-living HMO refurbs in Cardiff
- Large HMO conversions (7+ sharers) in Cardiff
- Commercial and above-shop to HMO in Cardiff
- Bedroom upgrades and room refits in Cardiff
- Layout changes and room reconfiguration in Cardiff
- Escape routes, emergency lighting and fire stopping in Cardiff
- Void and between-tenancy refurbs in Cardiff
- Fire doors in Cardiff