Loft conversions in Eltham
Loft conversions across Eltham SE9, from hip-to-gable conversions on the area's 1930s semis to dormers on the Edwardian terraces around Well Hall Road and sensitive work within the Progress Estate conservation area.
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 the Edwardian terraces around Well Hall Road and Eltham High Street and the wider mix across New Eltham, Mottingham and Avery Hill, and Eltham presents one of the strongest cases for loft conversion of any suburb in the area.
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 Greenwich planning approaches roofline alterations.
Loft conversion, extension and refurbishment, Eltham
A loft conversion delivered as part of a wider extension and full refurbishment on a typical Eltham family home, from structural work through to decoration.
View this projectWe 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, and good ridge heights mean Velux conversions are often feasible too. A hip-to-gable combined with a rear dormer is the most popular combination and delivers the most usable 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. Mansards are particularly effective where maximum headroom is needed. Outside conservation areas, rear dormers on these properties usually fall under permitted development.
The Progress Estate
One of the most architecturally significant housing estates in the country, and its Arts and Crafts cottages are among the most complex properties to convert. Many are listed or within the conservation area with Article 4 directions. Loft conversions are possible but need exceptional design sensitivity and close engagement with Greenwich Council's heritage team.
Larger detached homes
The more generous detached and larger semi-detached homes around Mottingham and Coldharbour often have the roof volume for a substantial conversion, sometimes two bedrooms and a bathroom in a single project. The larger roof footprint means hip-to-gable conversions deliver particularly impressive results.
Post-war housing
Post-war housing in parts of Eltham typically has trussed roof structures, a web of structural timbers filling the loft. Converting a trussed roof is more complex than a cut roof and needs structural alteration before conversion begins. We assess the roof structure at the consultation so the quote reflects what's actually there.
Conservation area properties
Properties within Eltham Park North, Eltham Park South and Coldharbour require planning permission for roofline alterations that affect the character of the area. Greenwich Council applies consistent design standards: dormers set back from the eaves, smaller than the existing roof area, and materials matching the original building.
Types of loft conversion we build in Eltham
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, and most commonly combined with a rear dormer.
Hip-to-gable and 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. Falls under permitted development in most Eltham locations outside conservation areas and the Progress Estate.
Velux / rooflight
No change to the roof shape, with Velux windows cut into the existing slope. 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 for maximum headroom and floor area. Always requires planning permission. Particularly effective on Eltham's Edwardian terraces where the existing roof pitch limits head height.
L-shaped dormer
Combines a rear dormer with a side dormer over an existing rear addition. Particularly effective on Eltham's larger properties in Mottingham and Avery Hill. Requires planning permission in most cases.
What you need to know before converting a loft in Eltham
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 houses and 50m³ for semi-detached and detached. We verify this for your property first.
The Progress Estate
The Progress Estate has Article 4 directions and conservation area status. Loft conversions 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.
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 covering structure, fire safety, insulation and staircase design. Royal Borough of Greenwich building control manages this and we handle it throughout.
Party walls
Most loft conversions on Eltham's semi-detached and terraced properties involve party wall considerations. We flag this early so notices are served and 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 confirm whether your address falls within a conservation area at the consultation and explain what it means for the project, including whether Article 4 directions apply.
Why Eltham homeowners choose us
Interwar semi experience
Eltham's 1930s semis are 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 space.
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 careful handling. 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 and how to present an application effectively.
Directly accountable
You deal with us throughout. We're on site, reachable, and our reputation depends on every Eltham job we do.
Itemised, honest quotes
Fully itemised quotes with no hidden costs. Any changes mid-project are costed in writing before we proceed.
Full project management
Structural engineer, building control and planning applications where required are all managed by us. You don't need to coordinate consultants or chase the council yourself.
Our loft conversion process in Eltham
Free consultation and roof assessment
We visit your 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 and planning
We work with your architect, or recommend one familiar with the 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 and contract
Once drawings are finalised we produce a fully itemised quote covering every element of the project. Scope, programme, stage payments and how variations are handled are set out in writing before any work begins.
The build
Structural work, roof alteration, insulation, windows and rooflights, first fix, plastering, second fix and decoration are managed as one programme, with regular updates throughout. The site is kept clean and secure every day.
Staircase and fit-out
The staircase is designed and built to fit the property properly, not squeezed in as an afterthought. Fit-out includes flooring, a bathroom if included, and all finishing trades coordinated without gaps between them.
Building control sign-off
the Royal Borough of Greenwich building control sign-off is obtained and we walk the finished loft with you to pick up any snags. The completion certificate is yours to keep. We don't close the job until you're satisfied.
Covering the whole of Eltham
We carry out loft conversions across Eltham and the surrounding Royal Borough of Greenwich, including:
Eltham loft conversion FAQs
How much does a loft conversion cost in Eltham?
A Velux conversion typically costs £20,000 to £35,000. A rear dormer runs £35,000 to £60,000. A hip-to-gable with rear dormer typically costs £45,000 to £70,000. A mansard on a Victorian or Edwardian terrace runs £55,000 to £80,000 and upwards. All figures are fully finished. We'll give you an accurate figure after visiting your property and assessing the roof structure.
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. Mansard conversions always require planning. Progress Estate and Eltham Park conservation area properties require planning permission for most roofline alterations. We check the position for your address at the consultation.
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 estate with conservation area status, Article 4 directions and in some cases listed buildings. Any roofline alteration requires planning permission and must be subordinate to the original roofline and sympathetic to the estate's character. We've worked on the estate 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 or more is ideal) and whether the property is in a conservation area. We assess both at the free consultation.
How long does a loft conversion take in Eltham?
A Velux conversion takes 4 to 6 weeks on site. A rear dormer or hip-to-gable takes 8 to 12 weeks. A combined hip-to-gable and rear dormer takes 10 to 14 weeks. A mansard takes 12 to 16 weeks. Planning permission, where required, adds 8 to 13 weeks before work can begin. We'll give you a realistic programme in your quote and stick to it.
Will a loft conversion add value to my Eltham home?
In most cases, yes, particularly when adding a bedroom with en-suite, which moves the property into a higher pricing bracket. A well-executed loft conversion typically adds 10 to 20% to value. 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.