Loft Conversions Portsmouth: Best Companies & Prices 2026
Looking for a loft conversion in Portsmouth? We've researched the best loft conversion companies serving Portsmouth, Southsea, and surrounding areas. Compare prices, read reviews, and get free quotes from trusted local specialists.
A loft conversion adds £30,000-£60,000 to a typical Portsmouth home's value while creating valuable extra living space.
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How Much Does a Loft Conversion Cost in Portsmouth?
Loft conversion prices in Portsmouth for 2026:
| Type | Cost | Time | Best For |
|------|------|------|----------|
| Velux / Roof Light | £25,000 - £40,000 | 2-3 weeks | Office, storage |
| Rear Dormer | £40,000 - £70,000 | 6-8 weeks | Extra bedroom (most popular) |
| Hip to Gable | £45,000 - £80,000 | 8-10 weeks | Semi-detached homes |
| Mansard | £60,000 - £100,000+ | 10-12 weeks | Terraced Victorian homes |
Cost per sqm: Around £2,400+ in the Portsmouth area.
Portsmouth-specific factors:
- Many Victorian/Edwardian terraces suit dormer or mansard conversions
- Party wall agreements often needed (terraced streets)
- Some conservation areas require planning permission
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Best Loft Conversion Companies in Portsmouth
D Scott & Sons Lofts
⭐⭐⭐⭐⭐ #1 Rated in Portsmouth | 20+ Years
| | |
|---|---|
| 📞 | 0800 44 88 474 |
| 📍 | Portsmouth, Southsea, Waterlooville, Havant, Fareham |
| 🌐 | dscottlofts.co.uk |
Portsmouth's most trusted loft specialists. Hundreds of local projects completed. Full project management, finance available, free surveys.
What customers say: "Transformed our Southsea terrace. Professional from day one."
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Lofts Portsmouth
⭐⭐⭐⭐⭐ Portsmouth Specialists
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|---|---|
| 📞 | Contact via website |
| 📍 | Portsmouth, Southsea, Cosham, Hilsea |
| 🌐 | loftsportsmouth.co.uk |
Dedicated Portsmouth loft conversion company. Specialists in Victorian terrace conversions common across the city.
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Complete Carpentry Southern Ltd
⭐⭐⭐⭐⭐ Local Favourite | Family Run
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|---|---|
| 📞 | 07939 890 225 |
| 📍 | Portsmouth, Waterlooville, Hampshire |
| 🌐 | completecs.co.uk |
Family business with exceptional attention to detail. Competitive quotes, excellent communication.
What customers say: "Couldn't recommend them enough. Quality work at a fair price."
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ABS Builders Hampshire
⭐⭐⭐⭐ Multi-Trade
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|---|---|
| 📞 | 02393 113994 |
| 📍 | Portsmouth, Waterlooville, Havant, Fareham |
| 🌐 | absbuildershampshire.com |
Full-service builders — good if you need loft + other work done by one team.
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BMC Loft Conversion Specialists
⭐⭐⭐⭐ Established
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|---|---|
| 📍 | Portsmouth & South Coast |
| 🌐 | loftsportsmouth.co.uk |
Experienced loft conversion specialists serving Portsmouth and the South Coast.
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Portsmouth Areas Covered
Our listed companies serve all Portsmouth areas:
Portsmouth City: Old Portsmouth | Southsea | Fratton | Milton | Eastney | Baffins | Copnor | Hilsea | Cosham | Paulsgrove | Drayton | Farlington
Greater Portsmouth: Waterlooville | Havant | Emsworth | Fareham | Gosport | Portchester | Wickham
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Do You Need Planning Permission in Portsmouth?
Most Portsmouth loft conversions don't need planning permission thanks to Permitted Development rights.
Planning Permission IS Needed For:
- 🏛️ Listed buildings
- 📍 Conservation areas (Old Portsmouth, parts of Southsea)
- 🏠 Flats and maisonettes
- ⬆️ Extending above the existing roof height
- 🏘️ Front-facing dormers (some restrictions)
You ALWAYS Need:
- Building Regulations approval
- Party Wall Agreement (most Portsmouth terraces)
> All companies above handle Building Regs and can advise on planning.
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Portsmouth Loft Conversion Ideas
Victorian/Edwardian Terraces (Southsea, Fratton, Milton):
- Rear dormer or mansard conversion
- Add master bedroom + en-suite
- Party wall agreement required
1930s Semis (Cosham, Drayton, Farlington):
- Hip-to-gable conversion
- Create two extra rooms
- Often no party wall needed
Post-War Houses (Paulsgrove, Leigh Park):
- Dormer or Velux conversion
- Good roof space for large rooms
- Usually straightforward
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Why Portsmouth Homeowners Convert Their Lofts
| Reason | Details |
|--------|---------|
| 💰 Add value | Adds £30,000-£60,000 to Portsmouth homes |
| 🏠 More space | Extra bedroom for growing families |
| 🏫 Stay in catchment | Keep kids in good Portsmouth schools |
| 💵 Cheaper than moving | Save stamp duty + moving costs |
| 🌊 Location | Stay near the seafront, city, harbour |
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Frequently Asked Questions
How much does a loft conversion cost in Portsmouth?
A loft conversion in Portsmouth costs between £25,000 and £100,000+ in 2026. Most homeowners pay £40,000-£70,000 for a rear dormer with bedroom and en-suite. Expect around £2,400+ per square metre.
How long does a loft conversion take in Portsmouth?
A typical Portsmouth loft conversion takes 6-8 weeks. Victorian terraces may take slightly longer due to party wall requirements.
Do I need planning permission for a loft conversion in Portsmouth?
Usually not. Most conversions fall under Permitted Development. You'll need planning permission in conservation areas (parts of Old Portsmouth and Southsea) or for listed buildings.
Will a loft conversion add value to my Portsmouth home?
Yes. Loft conversions add 15-20% to property value. On an average Portsmouth home (£300,000), that's £45,000-£60,000 — well above conversion costs.
What's the best loft conversion for a Portsmouth terrace?
For Victorian/Edwardian terraces common in Southsea, Milton, and Fratton, a rear dormer or mansard works best. Both maximise space while usually avoiding planning permission.
Can all Portsmouth houses have a loft conversion?
Most can if there's 2.2m headroom in the existing loft. Some flat-roofed properties or very small lofts may not be suitable. Companies offer free surveys to assess.
What is the 10 year rule for loft conversions?
The 10-year rule means unauthorised loft conversions become immune from council enforcement after 10 years (changed from 4 years in April 2024). This only covers planning permission — Building Regulations can always be enforced. Get proper approvals to avoid issues when selling.
Which lofts cannot be converted?
Lofts can't easily be converted if they have under 2.2m headroom, trussed roofs (W-shaped, common in 1960s+ homes), or are in listed buildings. However, dormer or mansard conversions can add height to otherwise unsuitable lofts.
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Get Your Free Portsmouth Quotes
Ready to transform your Portsmouth home? Get free, no-obligation quotes from trusted local companies:
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> Compare prices from up to 3 vetted Portsmouth loft specialists
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Last updated: February 2026 | Waterlooville.co
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