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Find trusted builder professionals for loft conversion in Southampton, Hampshire. Compare free quotes from vetted, insured professionals in the SO postcode area.
Average cost: £20,000–£65,000· 237+ reviews · Escrow-protected payments
Post your job in 2 minutes and receive up to 5 quotes from vetted builder professionals in Southampton.
Post a Job for FreeDormer, hip-to-gable, mansard and Velux loft conversions with full project management. Whether you need loft conversion for your home or commercial property in Southampton, TradeMatch connects you with qualified professionals who have been background-checked and carry verified public liability insurance.
Southampton homeowners typically pay £20,000–£65,000 for loft conversion, though costs vary based on the scope of work, materials required, and access to the property. Post your job with details and receive accurate, personalised quotes from up to 5 local builder professionals.
| Job | Low | Average | High |
|---|---|---|---|
| Single-storey extension | £15,000 | £30,000 | £50,000 |
| Loft conversion | £20,000 | £40,000 | £65,000 |
| Garage conversion | £5,000 | £12,000 | £20,000 |
| Wall removal | £500 | £1,500 | £3,000 |
| Porch build | £2,000 | £4,500 | £8,000 |
Prices are UK averages for 2026 and may differ in Southampton. Get an accurate quote by posting your job on TradeMatch.
Tell us about your loft conversion project in Southampton. Include details about scope, materials and timing.
Get up to 5 free quotes from vetted builder professionals in the SO area.
Read reviews from Southampton homeowners, compare prices and hire with escrow-protected payments.

Loft Conversion in Southampton typically costs £23,000–£74,750. Prices in Southampton, Hampshire vary based on the scope of work, materials, and access. Post your job free on TradeMatch to get personalised quotes from local builder professionals in the SO postcode area.
TradeMatch UK has vetted builder professionals in Southampton who specialise in loft conversion. Every tradesperson is background-checked, holds verified insurance, and is reviewed by real homeowners. Post your job and compare up to 5 quotes. All payments are escrow-protected.
A qualified builder for loft conversion should hold: CSCS Card, NVQ Level 6 Construction Management, FMB Member. The relevant regulatory body is Federation of Master Builders (FMB) / NHBC. TradeMatch verifies credentials before any professional can quote on loft conversion jobs in Southampton.
The duration depends on the scope of your loft conversion project. Most builder professionals in Southampton will provide a timeline with their quote. Post your job on TradeMatch with full details and you'll receive estimates including timescales from professionals in the SO area.
Yes. All quotes for loft conversion in Southampton on TradeMatch are completely free with no obligation. You only pay when you choose to hire, and payments are escrow-protected — funds are released only when you confirm the work is complete.
A reputable builder should offer a written guarantee of at least 12 months on labour for loft conversion. For larger projects, look for guarantees backed by Federation of Master Builders (FMB) / NHBC or an insurance-backed warranty. On TradeMatch, all Southampton professionals are vetted and payments are escrow-protected.
We recommend at least 3 quotes to ensure a fair price. TradeMatch lets you compare up to 5 free quotes from vetted builder professionals in Southampton. Don't automatically choose the cheapest — weigh reviews, qualifications and the detail in each quote.
A good quote for loft conversion in Southampton should include: itemised labour and materials costs, start and completion dates, payment terms, VAT status, and any exclusions. On TradeMatch you can compare detailed quotes side by side from multiple vetted professionals in the SO area.
Many builder professionals in Southampton work weekends, though they may charge 10–30% more for Saturday work and up to 50% extra on Sundays. On TradeMatch, specify your preferred dates when posting and local tradespeople who are available will quote accordingly.
While minor tasks may be suitable for DIY, loft conversion typically requires professional expertise and proper certification. Incorrect work can create safety hazards, void insurance, and cost more to fix. Hiring a vetted builder through TradeMatch ensures the work meets building regulations and is covered by guarantee.
Post your job free and compare quotes from vetted builder professionals in the SO area.
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