An HMO loft conversion adds one or two letting rooms, often with an ensuite, in the roof space. In Portsmouth, a place of roughly 210,000 people in Hampshire, the work is planned around the HMO rules for England and the council’s written HMO standards. With students as well as working sharers renting in Portsmouth, we plan bigger jobs for the gap between academic-year tenancies where we can.
- Area
- Hampshire, England
- Postcodes
- PO1, PO4 and PO5
- Location
- 15 miles south-east of Southampton
- Council
- Portsmouth City Council
- Pricing region
- South East
What do loft conversions for extra rooms in Portsmouth involve?
- Planning or permitted development check
- New stair within the protected route
- Building control sign-off
- Structural design and steelwork
- Ensuite where space allows
Which rules apply in Portsmouth?
Loft conversions for extra rooms in Portsmouth must satisfy national law for England, the council’s written HMO standards and, where walls, drainage or fire separation change, the building rules. In short:
- 7 or more sharers is a sui generis large HMO and normally needs planning permission.
- Building regulations cover structural changes, new partitions, ensuite drainage, fire-resisting construction and notifiable electrical work.
- Fire precautions follow a risk assessment; the LACORS Housing – Fire Safety guide (2008) is guidance, not law, but many councils base their standards on it.
- Licensed HMOs must meet national minimum bedroom sizes: 6.51 m² for one person aged 10 or over, 10.22 m² for two, and 4.64 m² for a child under 10.
Portsmouth City Council: local HMO schemes
| Article 4 (HMO) | In force across the council area Covers the whole city; in force since November 2011. |
|---|---|
| Additional licensing | In force across the council area City-wide additional HMO licensing 1 Sep 2023-31 Aug 2028. |
| Selective licensing | No scheme found |
Schemes change. Check the council’s current pages for the exact address in Portsmouth before you buy or start work. Source: Portsmouth City Council HMO licensing page, checked 2026-10-31.
How much do loft conversions for extra rooms cost in Portsmouth?
| Item | UK typical | Local guide | Per |
|---|---|---|---|
| Dormer loft conversion, about 30 m² | £40,000 – £60,000 | £44,800 – £67,200 | project |
| Rooflight loft conversion, about 30 m² | £22,500 – £30,000 | £25,200 – £33,600 | project |
Prices in Portsmouth are shown with our regional adjustment for South East (above the UK average). Your quote is itemised and fixed in writing once the scope and specification are agreed.
How long does it take?
Typical time on site: 6–10 weeks. We agree the programme with you before starting and send photo updates as the work progresses.
If the house is let to students, we work backwards from the next tenancy start date in Portsmouth.
When do Portsmouth landlords need it?
Typical reasons for this work in Portsmouth:
- Adding rooms to make an HMO work financially
- A house with usable roof space
Questions about loft conversions for extra rooms in Portsmouth
Does a loft room need a fire escape window?
In an HMO the main protection is usually a protected stair and fire doors. The building regulations and fire strategy decide the detail.
How far do you travel from Portsmouth?
We cover the whole of Hampshire and work UK-wide. For Portsmouth the nearest towns on our list are Gosport (2 miles), Fareham (5 miles), Ryde (6 miles).
Which council covers HMOs in Portsmouth?
Portsmouth is covered by Portsmouth City Council. We read the council’s written HMO standards before pricing, and you should check the licence position for the exact address.
How much do loft conversions for extra rooms cost in Portsmouth?
Our guide ranges for South East are in the table on this page, and the guide-price tool gives a figure for your house. A fixed written quote follows a free site visit.
Loft conversions for extra rooms near Portsmouth
- Gosport · 2 mi
- Fareham · 5 mi
- Ryde · 6 mi
- Havant · 6 mi
- Waterlooville · 6 mi
- Cowes · 9 mi
- All of Hampshire
Other HMO services in Portsmouth
- Extensions for extra rooms in Portsmouth
- Large HMO conversions (7+ sharers) in Portsmouth
- Escape routes, emergency lighting and fire stopping in Portsmouth
- Ensuite installation in Portsmouth
- Layout changes and room reconfiguration in Portsmouth
- Fire alarm and detection systems in Portsmouth
- Sound insulation in Portsmouth
- Small HMO conversions (3–6 sharers) in Portsmouth