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Loft Conversions in Isleworth
Turn your Isleworth loft into a bedroom, bathroom or office. Local team, fixed price, planning advice included.
- Free loft survey and head-height check
- Conservation area and planning advice
- Structural design and calculations
- Lawful Development Certificate or planning application
- Party Wall notices
- Building Regulations application and inspections
- Steel beams and structural work
- Dormer, hip to gable or Velux roof work
- Insulation and fire safety to current regulations
- New staircase
- Electrics, heating and plumbing
- En-suite if required
- Plastering, flooring and decoration
- Building Control completion certificate
Isleworth's terraces and semis make good loft conversions, but the right type depends on your street. On interwar semis around Osterley and Worton, a hip to gable with rear dormer gives the most room. On Victorian and Edwardian terraces, a rear dormer or L-shaped dormer over the back addition usually works best.
If your home is in one of Isleworth's conservation areas, such as Spring Grove or Old Isleworth, roof extensions are not covered by Permitted Development and need planning permission. A rear-facing Velux conversion or a carefully designed dormer is often the best route there. We give you straight advice at the survey.
Our team is based in Hounslow, a few minutes away, and handles the full job from design to completion certificate.
Isleworth (TW7), Spring Grove, Old Isleworth, Osterley, Worton, St Margarets, Brentford, Hounslow, Twickenham
Honest planning advice. We tell you up front what your street and roof will allow.
Fixed price. No open-ended day rates.
Party Wall handled. We manage the notices with your neighbours.
Local to Isleworth. Based in neighbouring Hounslow.
Fully insured. Public liability cover on every project.
How much does a loft conversion cost in Isleworth?
A Velux conversion typically costs £30,000 to £40,000, a rear dormer £40,000 to £55,000 and a hip to gable with dormer £50,000 to £65,000. An en-suite adds roughly £6,000 to £10,000.
Can I convert my loft in a conservation area?
Often yes, but you will need planning permission for a dormer, and the design needs to suit the street. Rear-facing rooflights are usually more straightforward. We advise on this at the survey.
How long does a loft conversion take?
Usually 8 to 12 weeks for a dormer and 4 to 6 weeks for a Velux, plus planning time if it is needed.
Book a free loft survey and get a fixed written quote. We cover Isleworth, Spring Grove, Osterley, St Margarets, Brentford and Hounslow. We reply within 1 working day.