Loft Conversions · Selsdon
— Selsdon · South Croydon · CR2
Loft conversions in Selsdon.
More space, the same street you love — built right the first time. Family-run loft conversion specialists working across Selsdon and South Croydon for over 20 years.
Loft conversions in Selsdon are very popular because LMDEC is based in South Croydon, just minutes away. Two decades of building experience means we know the local stock — interwar semis and detached homes from the 1930s, most with the generous hipped roofs that convert so well. Croydon Council planning rules covered, every time.
— Is your home right?
Is your Selsdon home right for a loft conversion?
Selsdon is full of the houses that convert beautifully — interwar semis and detached homes from the 1930s, most with the head height you need to make a real room rather than a cupboard with a skylight. Many have a hipped roof that slopes inwards on the side, which is why the local classic is a hip-to-gable (squaring off that slope) combined with a rear dormer — together they turn an awkward triangular attic into a proper double bedroom with an en-suite.
On the first visit we check the usable head height (you want roughly 2.2–2.4m at the ridge), the roof type, whether there’s room to land a staircase without spoiling the floor below, and the condition of the structure. One Selsdon bonus: a number of homes here still have their permitted development rights intact. If your ridge height won’t give proper headroom, we’ll tell you on the first visit — not after you’ve paid an architect for drawings.
— What we build
Types of loft conversion we build.
Hip-to-gable + rear dormer
The Selsdon classic. Squares off a sloped roof and adds a box dormer at the back — best for the area’s 1930s semis and detached homes, usually giving a double bedroom plus en-suite. See our loft conversion and extension services for the full scope.
Dormer & rooflight conversions
A flat-roofed dormer off the rear slope adds real height and floor space — the workhorse of South London conversions. A rooflight (Velux) conversion is the simplest and cheapest, with new windows set into the existing roofline and no change to the roof shape — ideal if your loft already has the height.
Mansard conversions
The most extensive option, with near-vertical walls for maximum space — usually reserved for where you want a whole extra storey. Not sure which you need? That’s our job. We’ll recommend the one that gives you the most usable space for your budget, not the most expensive on the list.
— Costs
Loft conversion Selsdon – costs.
Honest 2026 ranges for loft conversions in Selsdon based on recent local projects…” These small changes will bring your keyword count up to a healthy level without stuffing. Anyone who quotes a fixed price down the phone is guessing — your final figure depends on the roof, the finish and whether you add a bathroom.
| Conversion type | Range | Timeline on site |
|---|---|---|
| Rooflight / Velux | £40,000 – £55,000 | 5-7 weeks |
| Dormer | £55,000 – £75,000 | 6-8 weeks |
| Hip-to-gable + dormer | £65,000 – £90,000 | 7-9 weeks |
| Mansard | £90,000+ | 9-12 weeks |
Prices exclude VAT, architect, structural engineer and council fees. We confirm a fixed price in writing before any work starts — no provisional sums that balloon later.
→ See our full pricing guide for South London renovations
— Planning in Selsdon
Planning permission and Croydon Council.
Many Selsdon homes can be converted under permitted development check if you need planning permission on the Croydon Council website— no full planning application, as long as the design stays within set volume and height limits. That’s faster and cheaper, but the rights can be removed (for example on flats, or where a previous extension used up the allowance), so it always needs checking property by property.
Where it goes beyond those limits, you’ll need planning permission from Croydon Council — a decision typically takes around 8 weeks. Either way you’ll need Building Regulations sign-off, and if you share a wall with a neighbour, the Party Wall Act applies. We handle all of it — drawings, planning, building control and party wall notices — and factor the timing into the programme we give you on day one.
— Why LMDEC
Why Selsdon homeowners choose us.
Local — based in South Croydon. Minutes from Selsdon. The people who quote your job are the people who build it: one family team, the same site manager every day, no anonymous subcontractors turning up.
Over 20 years across Selsdon and South Croydon. We’re not learning on your house. A fixed price in writing, realistic dates we keep, and a tidy site you’re not embarrassed to have your neighbours see.
£2 million Public Liability insurance, two-year workmanship warranty, six-month return visit included. All gas work by Gas Safe registered engineers; all electrical work by NICEIC certified electricians. Building Regulations completion certificate and your guarantee in writing on handover. Most of our work comes from one happy neighbour recommending us to the next.
— Common questions
Frequently asked.
Do I need planning permission for a loft conversion in Selsdon?
Often no — many Selsdon homes qualify under permitted development. If your plans go beyond those limits, you’ll need permission from Croydon Council, which takes around 8 weeks. Either way you’ll need Building Regulations sign-off, and we handle the whole process for you.
How much does a loft conversion cost in Selsdon in 2026?
As a guide: a rooflight conversion from around £40,000, a dormer around £55,000–£75,000, and a hip-to-gable with dormer around £65,000–£90,000. Your exact price depends on the roof, the finish and whether you add a bathroom. We give you a fixed written quote before any work begins.
Which loft conversion is best for a 1930s Selsdon semi?
For the area’s hipped-roof semis and detached homes, a hip-to-gable plus rear dormer usually gives the most usable space. We confirm the right design for your specific roof on the first visit.
How long does a loft conversion take?
Typically 6-10 weeks on site, plus design and any planning beforehand. We give you a realistic programme on day one and stick to it.
Can I stay in the house during the build?
Usually yes. Much of the early work happens from outside via scaffolding, so most families stay put. We’ll talk you through the noisier stages in advance.
Part of our loft conversions across South London — every area we cover, including nearby Bromley. We also renovate across South Croydon, Purley & Kenley and Warlingham.
— Ready to start
Thinking about a loft conversion in Selsdon?
Book a free, no-pressure design visit and we’ll tell you honestly what your loft can take — what it’ll cost, how long it’ll take, and whether it’s even worth doing. No hard sell.