Loft Conversions
in
Eltham
Specialist loft conversions across Eltham SE9 — from hip-to-gable conversions on the area's dominant 1930s semis to dormer conversions on Edwardian terraces around Well Hall Road, and sensitive work within the Progress Estate conservation area. Local knowledge, quality builds, honest pricing.
Proudly Serving Eltham
Planning to Handover
Free Site Consultations
Interwar Housing
Made for Conversion
Eltham is one of the most consistently interwar suburbs in South East London — built out largely in the 1920s and 1930s, its housing stock is dominated by generously proportioned semi-detached homes with the hipped roof structures that make hip-to-gable loft conversions both straightforward and highly effective. Add to that the Edwardian terraces around Well Hall Road and Eltham High Street, and the wider mix of property types across New Eltham, Mottingham, and Avery Hill, and Eltham presents one of the strongest cases for loft conversion of any South East London suburb.
At Kelmend Construction, our loft conversions service covers Eltham and the surrounding Royal Borough of Greenwich. We know the roof structures typical to each part of SE9, the specific constraints of the Progress Estate and Eltham Park conservation areas, and how Royal Borough of Greenwich planning approaches roofline alterations. That knowledge is built into every project from day one.
We Know
Your Roof
1930s Hipped Semis
The dominant property type across Eltham — three and four-bedroom interwar semis with generous hipped roofs and cut roof structures throughout. Almost universally suitable for hip-to-gable conversion. Good ridge heights across the area mean Velux conversions are also often feasible. A hip-to-gable combined with a rear dormer is the most popular combination and delivers the most usable loft space.
Edwardian Terraces
The Edwardian terraces around Well Hall Road and Court Road typically have the roof pitch and ridge height for a rear dormer or mansard conversion. Mansard conversions are particularly effective on Edwardian terraces where maximum headroom is needed. Outside conservation areas, rear dormers on these properties usually fall under permitted development.
Arts & Crafts Cottages
The Progress Estate is one of the most architecturally significant housing estates in the country — and its Arts and Crafts cottages are among the most complex properties to work on for loft conversions. Many are listed or within a conservation area with Article 4 Directions. Loft conversions here are possible but require exceptional design sensitivity and close engagement with Greenwich Council's heritage team. We have experience on the estate.
Larger Detached Homes
The more generous detached and larger semi-detached homes around Mottingham and Coldharbour often have the roof volume for a substantial loft conversion — sometimes accommodating two bedrooms and a bathroom within a single project. The larger roof footprint means hip-to-gable conversions deliver particularly impressive results on these properties.
Post-War Housing
Post-war housing in parts of Eltham typically has trussed roof structures — a web of structural timbers that fills the loft space. Converting a trussed roof is more complex than a cut roof and requires structural alteration before conversion work begins. We assess the roof structure at the consultation stage for every project, so the quote reflects what's actually there.
Conservation Area Properties
Properties within Eltham Park North, Eltham Park South, and Coldharbour conservation areas require planning permission for roofline alterations that affect the character of the area. Greenwich Council applies consistent design standards — dormers should be set back from the eaves, smaller than the existing roof area, and use materials that match the original building.
Types of
Loft Conversion
Hip-to-Gable
Extends the sloping hip end of the roof outward to create a vertical gable — the most effective single alteration on Eltham's 1930s semis. Dramatically increases usable floor area. Usually permitted development on semi-detached and detached properties outside conservation areas. Most commonly combined with a rear dormer.
Hip-to-Gable & Rear Dormer
The combination that delivers the most usable loft space on Eltham's interwar semis. The hip-to-gable creates width; the rear dormer creates headroom across the full depth. Typically delivers a large bedroom, en-suite, and often a second bedroom or study. Usually permitted development outside conservation areas.
Rear Dormer
A box-shaped dormer projecting from the rear roof slope. Effective across Eltham's Edwardian terraces and 1930s semis alike. Significantly increases headroom and floor area. Falls under permitted development in most Eltham locations outside conservation areas and the Progress Estate.
Velux / Rooflight
No change to the roof shape — Velux windows cut into the existing slope to bring in light. Only viable where sufficient head height exists. On Eltham's 1930s semis, which have generous roof pitches, Velux conversions are often feasible and provide a cost-effective first bedroom. Almost always permitted development.
Mansard
Changes the entire rear roof slope to near-vertical — maximum headroom, maximum floor area. Always requires planning permission. Particularly effective on Eltham's Edwardian terraces where existing roof pitch limits head height. Greenwich Council reviews design quality carefully, especially in conservation areas.
L-Shaped Dormer
Combines a rear dormer with a side dormer over an existing rear addition — creating significantly more floor area than a standard rear dormer. Particularly effective on Eltham's larger properties in Mottingham and Avery Hill. Requires planning permission in most cases.
What You Need
to Know
Eltham sits within the Royal Borough of Greenwich — a planning authority with several important considerations for loft conversions, particularly around the Progress Estate and Eltham's conservation areas.
Permitted Development
Most Velux, dormer, and hip-to-gable conversions on Eltham's 1930s semis and Edwardian properties fall under permitted development outside conservation areas. Volume limits apply — 40m³ for terraced, 50m³ for semi/detached. We verify this for your specific property first.
The Progress Estate
The Progress Estate has Article 4 Directions and conservation area status. Loft conversions here require planning permission and must be designed with exceptional sensitivity to the Arts and Crafts character. Greenwich Council's heritage team is closely involved. Possible — but demanding.
Conservation Areas
Eltham Park North, Eltham Park South, Coldharbour, and the Page Estate all carry conservation area status. Dormers in these areas require planning permission where they affect the character of the area or are visible from the street or public spaces.
Interwar Character
Greenwich Council's design guidance for Eltham emphasises respect for the area's consistent interwar character. Dormers should be set back from the eaves, materials should match the existing roof, and front dormers are very rarely approved.
Building Regulations
All loft conversions require building regulations approval — structural integrity, fire safety, insulation, and staircase design. Royal Borough of Greenwich building control manages this process and we handle it throughout the project.
Party Wall
Most loft conversions on Eltham's semi-detached and terraced properties involve party wall considerations. We flag this early so notices are served and any agreements reached well before the build starts.
Eltham's
Conservation Areas
Several conservation areas across Eltham affect what's possible with a loft conversion. We've worked across all of the following:
Why Eltham
Homeowners Choose Us
Interwar Semi Specialists
Eltham's 1930s semi-detached stock is ideal for hip-to-gable conversion — and it's a project type we've delivered many times across SE9. We understand the roof structures, the structural approach, and how to maximise the usable loft space on this property type.
Progress Estate Experience
Loft conversions on the Progress Estate are complex — listed buildings, conservation area status, Article 4 Directions, and Greenwich's heritage team all need to be navigated carefully. We've done it before and understand what's required.
Royal Borough of Greenwich Knowledge
We know how Greenwich Council's planning team approaches loft conversion applications in Eltham — what design standards they apply, what they're likely to approve, and how to present an application effectively.
Family-Run, Directly Accountable
You deal with us throughout. On a significant home improvement project in Eltham, that direct accountability matters — we're on site, reachable, and our reputation depends on every job we do.
Itemised, Honest Quotes
Fully itemised quotes — no hidden costs. Any changes mid-project are costed in writing before we proceed. The standard you should expect but that many builders don't deliver.
Full Project Management
Structural engineer, building control, planning applications where required — we manage all of it. You don't need to coordinate consultants or chase the council yourself.
Our Loft Conversion
Process in Eltham
Free Consultation & Roof Assessment
We visit your Eltham property, go into the loft, and assess the roof structure, head height, and planning position. We tell you what's feasible, what it will cost, and whether planning permission is required — before any design work begins.
Design & Planning
We work with your architect or recommend one familiar with Royal Borough of Greenwich. We advise on the planning route and manage the process — including party wall notices and, for Progress Estate properties, early engagement with Greenwich's heritage team.
Detailed Quote & Contract
Once drawings are finalised, a fully itemised quote covering every element of the project. Clear on scope, programme, payments, and how variations are handled.
The Build
Structural work, roof alteration, insulation, windows and doors, first fix, plastering, second fix, decoration — managed as a single programme. Regular updates throughout.
Staircase & Fit-Out
The staircase is designed and built to fit the property — not an afterthought. Fit-out includes flooring, bathroom if included, and all finishing trades coordinated to flow without gaps.
Building Control Sign-Off
Royal Borough of Greenwich building control sign-off obtained. Full snagging walkthrough. We don't close the job until you're satisfied.
Covering the
Whole Area
We carry out loft conversions across Eltham and the surrounding Royal Borough of Greenwich. Our core areas include:
Eltham Loft Conversion
FAQs
How much does a loft conversion cost in Eltham?
A Velux conversion in Eltham typically costs £20,000–£35,000. A rear dormer runs £35,000–£60,000. A hip-to-gable with rear dormer — the most popular combination on Eltham's 1930s semis — typically costs £45,000–£70,000. A mansard on an Edwardian terrace runs £55,000–£80,000+. All costs are fully finished. We'll give you an accurate figure after visiting your property.
Do I need planning permission for a loft conversion in Eltham?
Most conversions on Eltham's 1930s semis fall under permitted development outside conservation areas — no planning application required. Mansard conversions always require planning. Progress Estate and Eltham Park conservation area properties require planning permission for most roofline alterations. We check the specific position for your address at the consultation stage.
Can I convert the loft on a Progress Estate property?
Yes — but it requires careful planning and design. The Progress Estate is a nationally significant Arts and Crafts housing estate with conservation area status, Article 4 Directions, and in some cases listed buildings. Any roofline alteration requires planning permission and must be designed to be subordinate to the original roofline and sympathetic to the estate's character. We've worked on the estate before and understand what Greenwich Council's heritage team will and won't approve.
Is my Eltham 1930s semi suitable for hip-to-gable conversion?
Almost certainly. Eltham's interwar semis have generous hipped roofs and cut roof structures that make hip-to-gable conversions both structurally straightforward and highly effective. The key checks are ridge height (2.2m+ ideal) and whether the property is in a conservation area. We assess both at the free site consultation.
How long does a loft conversion take in Eltham?
A Velux conversion takes 4–6 weeks on site. A rear dormer or hip-to-gable takes 8–12 weeks. A combined hip-to-gable and rear dormer takes 10–14 weeks. A mansard takes 12–16 weeks. Planning permission (where required) adds 8–13 weeks before work can begin. We'll give you a realistic programme in your quote.
Will a loft conversion add value to my Eltham home?
In most cases, yes — particularly adding a bedroom with en-suite, which moves the property into a higher pricing bracket. A well-executed loft conversion typically adds 10–20% to value. On a £550,000 Eltham home, that's £55,000–£110,000 of additional value from a project costing £45,000–£65,000. Build quality matters significantly — a poor conversion can cause problems at sale.
Converting Your Loft
in Eltham?
Tell us about your project and we'll come to you for a free, no-obligation consultation anywhere in SE9.
No pushy sales. No call centres. Just a straight conversation about your Eltham project.