Loft Conversion
in Hounslow
Compare quotes from vetted Hounslow loft conversion specialists. Dormer, Velux, hip-to-gable and mansard conversions from £47,000. Free no-obligation quotes.
- Local loft conversion specialists in Hounslow
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How Much Do Loft Conversion Cost in Hounslow?
Real prices from completed projects in Hounslow and the surrounding area. Costs vary by size, specification and access — use these as a starting guide, then get 3 free quotes for your specific project.
The most popular type in the UK. Creates a full-height room with a vertical rear wall and flat roof. Usually includes a bathroom and Velux windows to the front.
Get quotes for this →Ideal for end-of-terrace and detached homes with a hipped roof. Extends the ridge line to create maximum usable floor space. Often paired with a rear dormer.
Get quotes for this →The most spacious conversion type — a near-vertical rear wall with a shallow-pitched roof. Common in London and city terraces. Typically requires planning permission.
Get quotes for this →Costs depend on size, spec and access. The best way to know your exact price is to compare 3 quotes from local specialists.
Get free quotes →Hounslow pricing note: Building costs in London are typically 30–40% above the national average, driven by higher labour rates, congestion charges, stricter planning requirements and premium material delivery costs. Inner London boroughs (Zones 1–2) command the highest rates. Prices shown are indicative ranges for Hounslow and London. Always get at least 3 written quotes before committing to any builder.
Loft Conversion Specialists Who Know Hounslow
Tell us about your loft conversion project once and up to three local specialists who cover Hounslow get in touch with quotes — free, with no obligation, and you choose who to hire.
Trades covering Hounslow normally work across the surrounding area as well — including Walthamstow, Greenwich and Croydon — so your shortlist is drawn from the wider London pool rather than a single postcode.
Building costs in London are typically 30–40% above the national average, driven by higher labour rates, congestion charges, stricter planning requirements and premium material delivery costs. Inner London boroughs (Zones 1–2) command the highest rates. That regional context is worth holding in mind when you compare the quotes that come back for your Hounslow job.
Local facts: Hounslow
- Local planning authority: Hounslow Council
- Region: London
- Town-centre postcode district: TW3
- Average house price (Hounslow local authority, June 2026): £512,888 (+1.1% year on year) — detached £1,011,513, semi-detached £694,432, terraced £593,764, flats £346,804
- BestBuilders loft conversion members covering Hounslow: Js Diamond Finish (13 miles), BHM Extensions Ltd (19 miles)
Planning-authority, region and postcode data: ONS Postcode Directory (Open Government Licence). House prices: HM Land Registry UK House Price Index for the local authority (OGL). Member coverage is each member's own registered base and travel radius.
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Loft Conversion in Hounslow — FAQs
Plan Your loft conversion Project in Hounslow
Whether you're researching costs, checking planning rules, or comparing approaches before you commit, our editorial team has produced these guides to help Hounslow homeowners make informed decisions about their loft conversion project.
Loft Conversion Cost Guide
Detailed UK price ranges, regional adjustments and worked examples for loft conversion projects.
Read Loft Conversion Cost Guide →All Loft Conversion Specialists
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Browse Loft Conversion Specialists →All Cost Guides
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View All Cost Guides →Planning your loft conversion project? Read these guides:
Planning Your Loft Conversion in Hounslow
Before you compare quotes, it's worth understanding the full UK price picture for loft conversion and how Hounslow sits within it. The guides below cover average costs, what affects your quote, and how to choose a builder you can trust.
UK Loft Conversion Cost Guide
Full price ranges, worked examples and the factors that move your quote — drawn from real project data across 519 UK towns.
Read the loft conversion cost guide →Loft Conversion Across the UK
Browse loft conversion services nationwide, see what's typical in your region, and request quotes from any UK location.
Visit the UK loft conversion hub →Planning Permission for Loft Conversion in Hounslow
Find out whether your loft conversion needs planning permission in Hounslow, what Permitted Development limits apply, and how rules differ in conservation areas, Article 4 zones, and listed-building settings.
Read the loft conversion planning rules →More homeowner resources: all UK building guides, cost guides, planning permission, comparisons, how-to guides and industry insights.