Catford SE6 House Extensions on a Uniform Estate With Uneven Rules
Stand on almost any street off Bromley Road and the houses look the same. Edwardian terraces, bay fronts, the same brickwork, the same roofline, laid out on a grid of wide tree-lined streets.
They are not governed the same way. A conservation area boundary runs through this stock, and on one side of it you need permission for things that are free on the other. Nothing on the pavement tells you which side you are on.
So the first job here is establishing where your address sits. Design And Build works throughout SE6, and the whole project stays with us from first sketch to final invoice under a single contract.
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House extension Catford: the Corbett Estate terraces
Rear extension Catford and the dead ground alongside
The Edwardian terrace here was built with a rear addition and a narrow strip of ground beside it that does nothing. Roofing that strip over is what most owners here do first, and it alters daily life more than anything else available.
A cramped galley becomes a space running the entire width of the plot. Two details decide whether it works. Manholes and gullies on these plots almost always sit in the way, and how the roof meets the old brickwork is what separates a dry room from a persistent leak.
Side return extension Catford on a Corbett terrace
How far back to go is a decision, not a limit to be reached. The national allowance behind an attached house stands at three metres, and that is where the rules stop rather than where the design should aim.
Behind an existing rear addition, taking the full three metres can leave the middle of the ground floor dark. We test daylight across the whole plan before settling on a number. If the work does sit inside the national allowances, a lawful development certificate confirms it in writing — which is what a conveyancer will want at sale.
Canadian Avenue and the villas that predate the estate
Not everything here is Edwardian. Lewisham’s character appraisal records that some late-Victorian villas survive on Canadian Avenue, from before the estate development that surrounds them.
Those houses are larger, detached or semi-detached, and built to a different structural pattern. They take a wraparound or a two-storey addition that a terrace never could. They also sit in the most closely assessed part of the designation, so the design has to answer the appraisal rather than the plot alone.
Construction company Catford: same terrace, different permission
Sixty-nine per cent voted for the direction
Culverley Green was designated in 1990, and what happened eleven years later is unusual. The appraisal records that the document was drafted following requests from the Culverley Green Residents Association in 2001.
The council then consulted on management proposals, including the making of an Article 4(1) direction, and those proposals were supported by sixty-nine per cent of respondents. Most Article 4 directions are made by a council over the objections of residents. This one was asked for, and voted through by the people who live under it.
Windows, doors, paving and paint
That matters because the direction is broad. Inside it, works that need no permission elsewhere in Lewisham require an application: replacement windows and doors, roof material changes, chimney alterations, porches, boundary walls and gates, front-garden paving, and painting the outside of the house.
A homeowner who replaces sash windows with uPVC here has carried out unauthorised development. The council can require it to be undone. It is worth checking before the order is placed rather than after the scaffold is up.
Two identical houses, two sets of rules
The Corbett Estate is larger than the conservation area. A good deal of it sits outside the boundary, which means two houses built by the same developer, in the same year, to the same drawings, can be governed completely differently.
One needs consent to change a front door. The other does not. Neighbours compare notes and reach the wrong conclusion, and precedent from four doors down is worth nothing if the line runs between you. The boundary is published — we check it against the specific address at the first visit.
Planning permission Catford for a frontage change
The appraisal is specific about what gives the area its interest: carved and moulded capitals and window surrounds, terracotta window dressings, sash windows, solid timber doors and stained glass.
That list is the argument an application has to answer. A scheme that keeps those elements, or reinstates them where they have been lost, is arguing from the council’s own document. One that ignores them is arguing from nothing. Loft conversions and roof alterations are read the same way, against the roofline of the terrace rather than the house alone.
Design and build Catford under one contract
Most people end up appointing four separate outfits and chasing all of them. When the tender exceeds what the drawing assumed, or a detail turns out to belong to nobody, the bill for sorting it lands on the homeowner.
Everyone here sits inside one construction company. Our architects and structural engineers work in the same office, so nothing is drawn that the fabric will not carry. Surveyors on our staff handle the Party Wall etc. Act 1996, which on these terraces means notices to both neighbours before a single beam goes in.
House renovation Catford below Forest Hill prices
House refurbishment Catford after a period purchase
A great many projects in SE6 begin the same way. Someone buys an unmodernised Edwardian terrace here because the same house costs considerably more in Forest Hill, Lewisham or Lee, then spends the difference on putting it right.
That is a different brief from extending a house you have lived in for a decade. The work is whole-house rather than one room, the sequence matters more, and the budget is finite because it came out of what was saved on the purchase. We price it as one job with one programme rather than a series of trades.
Property renovation Catford: rewiring and damp
The stock is generally sound. London stock brick, solid walls, decent proportions — but frequently neglected rather than damaged, with wiring extended piecemeal and heating sized for a smaller household.
A proper refurbishment strips all of that back before anything is rebuilt. Circuits and pipe runs go in fresh, moisture is chased to its source instead of painted over, and any thermal upgrade is specified for brickwork that needs to breathe. Cement render and modern masonry paint trap water in walls built to breathe, and the damage takes years to appear. Bring interior design in while the layout is still open.
HMO conversion Catford and the borough rule
Lewisham operates a borough-wide Article 4 direction covering small houses in multiple occupation. It applies everywhere in the borough, inside a conservation area or outside one.
The effect is that converting a family house into a small HMO needs planning permission where the national rules would otherwise allow it. Given how much of Catford is rented, this catches more owners here than in most parts of south east London. It is a separate question from the conservation designation and has to be answered on its own.
Builders Catford either side of the Ravensbourne
Building contractors Catford near the Pool and the 1968 flood
The Ravensbourne and its tributary the Pool, which comes down from Sydenham, run through Catford and meet near Catford Bridge. The river has a long history of flooding, and the 1968 flood put several thousand homes between here and Lewisham under water.
Most of SE6 sits on London Clay, which is stable enough, with pockets of river gravel along the Ravensbourne corridor. Near the water the picture changes and ground floor levels, damp risk and foundation depth all become site-specific questions. Checking the flood risk map takes about a minute and it is where we start on any address near the water.
Area We Cover
Which Catford street are you on?
That is not a rhetorical question. Send us the address and we will confirm whether it falls inside the Culverley Green boundary, what the Article 4 removes if it does, whether the borough HMO direction applies, what the ground is likely to be, and how much permitted development the house has left.
We cover Catford and the wider SE6 area — the Corbett Estate streets, Culverley Green, Canadian Avenue, Rushey Green, Bromley Road, Torridon Road and Catford Bridge — plus Forest Hill, Lewisham, Beckenham and the wider SE postcodes.
No charge for the survey. In Catford the first thing we open is a boundary map.
