Merton · London
Velux Loft Conversion in Merton
South-west borough including Wimbledon — premium extensions and full refurbs common.
Merton
Velux Loft Conversion specialists across Merton.
We deliver velux loft conversion projects across the full Merton postcode set — SW19, SW20, CR4, SM4. South-west borough including Wimbledon — premium extensions and full refurbs common.
A Velux (or rooflight-only) loft conversion is the simplest, fastest and cheapest loft type. It keeps the existing roof structure unchanged — no dormers, no structural extension — and instead insulates the rafters, installs rooflight windows along the slope, lifts the floor onto new joists, and brings the space up to current building regulations as a habitable room. It only works where the existing ridge height gives enough usable headroom under the slope, but where it does, it's a 6–8 week project that delivers a genuine extra room for a fraction of the cost of a dormer.
Every Merton project includes a free desk-based planning assessment before we quote. We know the local planning officers, party wall surveyors and approved inspectors by name.
Costs
Velux Loft Conversion cost in Merton 2026.
| Configuration | Cost range | Timeline |
|---|---|---|
| Basic Velux conversion (one bedroom) | £30,000–£40,000 | 5–7 wks |
| Velux + ensuite | £40,000–£50,000 | 6–8 wks |
| Larger Velux + premium rooflights | £45,000–£55,000 | 7–9 wks |
Local advantage
Eight years of velux loft conversion work in Merton.
Familiarity with Merton's planning officers, party wall surveyors and approved inspectors cuts weeks off the approval timeline. We deliver consistent quality across all 4 postcodes the borough covers.
Recent Merton work
Velux Loft Conversion examples.
Builderr vs other London builders.
The construction industry has a wide distribution of operators. Here's what changes between a directly-employed, fixed-scope outfit and the alternatives.
| Criterion | Builderr | Typical London builder | Cowboy outfit |
|---|---|---|---|
| Labour model | Directly employed team (PAYE) | Mixed subcontract gangs | Day-rate cash labour |
| Pricing | Fixed-scope itemised quote | Estimate + provisional sums | Verbal price + variations |
| Design & engineering | In-house architect + SE | Outsourced, separate billing | Builder draws on the back of an envelope |
| Planning + LDC handled | Yes — included in price | Often charged extra | Builder asks you to apply |
| Party wall surveyors | Instructed by us | Your responsibility | Skipped (illegal) |
| Building control | Plans + site inspections booked by us | Building Notice route | Not registered |
| Project management | Dedicated PM, weekly photo updates | Foreman doubles up | Owner-manager juggles 5 jobs |
| Payment schedule | Stage payments against signed-off milestones | Weekly invoices | Cash up front |
| Insurance | £10M PL + 10yr structural warranty | £2–5M PL only | No documented cover |
| Snags at handover | <3 typical | 20–30 typical | Walk-off mid-job common |
| Variation creep | 0% — fixed scope | +15–25% over original quote | +40%+ regularly |
Save £8,500–£19,125 on a velux loft conversion in Merton.
Industry data (FMB, RICS, Which? Trusted Trader 2024) shows the average London construction project overruns by 18–22% on cost and 25–35% on time. Fixed-scope contracts with a single accountable team eliminate that variance. The savings above assume a typical project at £42,500.
FAQ
Velux Loft Conversion in Merton.
How much does a velux loft conversion cost in Merton?+
Velux Loft Conversion projects in Merton typically cost £30,000–£55,000. Merton sits across postcodes SW19, SW20, CR4, SM4; local rates align with the wider London market.
Do velux loft conversions in Merton need planning permission?+
South-west borough including Wimbledon — premium extensions and full refurbs common. We carry out a free desk-based planning assessment for your specific address before quoting, identifying whether permitted development, prior approval, or full planning applies.
Do you work across all Merton postcodes?+
Yes — we deliver velux loft conversion projects across all Merton postcodes including SW19, SW20, CR4, SM4.
How much does a Velux loft conversion cost?+
Typically £30,000–£55,000 fully fitted depending on size, ensuite and rooflight count.
Do I need planning permission for a Velux conversion?+
Usually no — rooflights on the existing slope fall under permitted development. Front rooflights in conservation areas may need approval.
Get a Merton velux loft conversion quote.
Senior consultant call within one business hour. Fixed-scope quote for your Merton project — no provisional sums.
Other types in Merton
Explore other build types in Merton.
Velux Loft Conversion across London