House Extension Streatham SW16: EJ Tarver Built No Two Alike
On one Streatham estate you cannot point at the house next door and ask for the same thing. The architect made sure of it.
Lambeth’s own conservation area profile records the reason. Of Telford Park the council writes that the architect was EJ Tarver, who skilfully ensured that no two of his Queen Anne-style houses on the estate were identical.
That single sentence changes how a scheme is argued here. On most conservation-area streets you establish what neighbours already have and design within it. On Telford Park there is no matching neighbour to cite.
Streatham is not one place either. Roughly forty-six thousand people live across four wards, at a density of more than eleven thousand to the square kilometre. The estates were built for different buyers at different dates, and the council treats each of them separately.
Design And Build works across SW16, from the terraces off the High Road to the villas on the hill. Design, engineering, surveying and the trades are all our own. What follows is what Lambeth actually says about these estates.
EJ Tarver, and what a house extension Streatham has to answer
Telford Park, laid out between 1878 and 1882
Telford Park is conservation area 44, designated on 9 September 1994.
The council describes it as suburban houses along Criffel Avenue, Killieser Avenue, Telford Road and parts of Kirkstall Road and Thornton Avenue, laid out between 1878 and 1882. Four years of building, one architect, and a deliberate refusal to repeat a design.
For an owner that cuts both ways. Variety means an officer has no single template to measure against, so a well-argued scheme has room. It also means the heritage statement has to describe your house specifically, because the appraisal cannot describe it for you. Our architects survey the individual building before drawing anything.
Queen Anne detailing is unforgiving in this respect. Gauged brickwork, moulded terracotta, tall casements and shaped gables were drawn as a composition, and an addition that ignores the proportion of the original reads badly from the street even when the materials are right.
Streatham Common, and the ground that rises behind it
Streatham Common is conservation area 43, designated on 16 June 1994, with its boundary last changed on 18 July 2016 and a character appraisal published in 2017.
Lambeth calls it a centuries-old open space that forms the heart of the area, with an open-landscaped character becoming wilder as it rises from Streatham High Road. The Rookery and Park Hall, both historic landscapes, sit inside the boundary.
The rise matters practically. Ground levels change across a plot on the streets running up from the High Road. That affects how an addition at the back reads from a neighbouring garden, and what the drainage has to do. Levels are established at survey, not assumed from a plan.
The perimeter buildings around the common are mixed: commercial, residential and institutional, reflecting how the district grew in the nineteenth century. A scheme facing the open space is judged in that setting rather than against a run of matching houses.
Get a Free Quote
Tell us about your project and we’ll get back to you shortly.
Planning permission Streatham SW16 depends on which estate
Leigham Court Estate, built for artisans and labourers
Leigham Court Estate is conservation area 31, first designated on 18 February 1981, and it carries an Article 4 direction.
The council records that it was developed by the Artizans, Labourers and General Dwellings Company between 1889 and 1928. It calls the result an early example of a model housing estate: long terraces of good-quality, purpose-built flats and houses, built on a grid in repeating styles.
Repeating styles, in other words. The exact opposite of Telford Park, a mile away.
Model housing of this kind was built to a controlled specification, in long runs, by a company whose purpose was volume and decency rather than display. That consistency is precisely what the designation now protects, so the argument on this estate runs the other way from Tarver’s: here you are expected to match, not to differ.
The direction here went to committee in November 1995 and was served in 1996. Its stated purpose was to strengthen development control and prevent harmful changes to the estate’s character. It required approval from the Secretary of State, which is not routine.
There is a further layer on this road. Conservation area 28 covers Leigham Court Road South, with a character appraisal published in September 2016, while the northern stretch carries its own separate designation. One road, three designations, three sets of expectations.
So whether you need planning permission in Streatham begins with which estate the address sits in, not with what you want to build. Designation runs under section 69 of the Planning (Listed Buildings and Conservation Areas) Act 1990, and Lambeth publishes a profile for every one of its areas.
Builders Streatham work under Lambeth's constraints tab
Lambeth does something useful that most boroughs do not, and it takes two minutes.
The council tells owners to search the address in its planning application database, open the result, and click the constraints tab. If the property is in a conservation area, it shows there. So does any direction attached to it.
That is not a workaround. It is how the council itself records the position, and the same tags appear on its weekly lists. An application in one of these estates is published with the conservation area and the direction both named against it.
Two minutes of checking removes the largest single risk in a Streatham project, which is designing a scheme for rights the address does not have. We do it before quoting rather than after.
Three Article 4 directions, and one that lapsed
Three directions bite on houses in Streatham, and they were made decades apart.
Park Hall Road, conservation area 19, was designated in 1974 and its direction dates from 1985. The council describes it as eight pairs of mid-nineteenth-century villas, among the earliest suburban development in the locality. Leigham Court Estate followed in 1996. Streatham Lodge Estate, conservation area 62, was designated on 8 June 2009, with a direction served on 23 July 2010 and confirmed that October.
The Streatham Lodge entry carries a warning worth reading twice. The council states that the previous directions have lapsed and no longer apply, and that the current one covers only part of the conservation area.
An owner working from an older notice would get the position wrong in either direction: assuming a restriction that has gone, or assuming coverage that never reached their street.
Windows are what the direction actually catches
Look at what Lambeth has recently been asked to decide in these areas and one thing dominates.
One application sought to replace single-glazed timber windows and rear doors with double-glazed uPVC units. Another proposed replacing single-glazed timber sashes and casements, front and back, with double-glazed timber sashes. A third concerned a boundary fence to a roof terrace.
None of those would need an application on an ordinary street. All three were lodged with the conservation area and the Article 4 direction listed against them.
A recent decision shows the other side of it. Work at the back and side of a house here, taking out an old conservatory and part of the garage, was approved in April 2026 subject to a tree condition. The owners had to supply a method statement from an arboriculturist, and a plan showing how the trees would be protected, before anything could begin on site.
Trees carry their own controls inside a conservation area. Felling or lopping anything above a certain size needs consent in its own right, quite apart from whatever the building work requires.
That is what a direction does in practice. It moves windows, doors, roof coverings and boundary treatments from things you simply do into things you apply for. Where a scheme does fall within permitted development, a lawful development certificate records the fact and answers the question for a future buyer.
House renovation Streatham on stock built for two different markets
Leigham Court Road North, built for everyone else
Leigham Court Road North is conservation area 60, designated in 2002.
Lambeth describes it as a late nineteenth-century development of upper-class housing, with large, well-designed houses whose spacious mature gardens give a pleasing suburban character.
Read that against the Leigham Court Estate entry and the contrast is stark. Purpose-built flats and houses for artisans and labourers, and large houses in big gardens, on the same road, within a generation of each other.
The renovation work differs accordingly. Model-estate terraces were built to a budget and a standard specification, so the recurring issues are services, roof coverings and the consequences of earlier alterations done cheaply. The larger villas bring bigger rooms, more elaborate joinery and plasterwork, and the cost of putting back what the twentieth century removed.
A whole-house job on either usually starts by removing what later decades added, then renewing the services, then deciding how to insulate solid walls without trapping moisture in them. The order matters more than the specification.
Between the two sit the streets off the High Road: late Victorian and Edwardian terraces, and the substantial nineteen-thirties blocks in Art Deco styles that the council notes as a feature of the road itself. Each needs a different first question at survey. Our structural engineers read the building before the checklist, and interior design joins while the plan can still move.
One contract, one price, one construction company Streatham briefs
The usual route is an architect, an engineer, a builder and a party wall surveyor. Four appointments, four contracts, four sets of assumptions.
In a district with this many designations and three separate directions, that is where delay comes from. Drawings prepared on the assumption of permitted development, for a street where it has been withdrawn, cannot be built.
We hold the sequence instead. Survey, drawings, heritage justification, engineering and construction run through one team at one agreed price. Our own surveyors serve the notices required by the Party Wall etc. Act 1996. Nobody on site is subcontracted.
It also means one person answers for the whole of it. When an officer asks why a window detail was drawn a particular way on a Tarver house, the answer comes from the team that surveyed the building, not from a consultant who left the job at planning stage.
One distinction is worth drawing, because owners run the two together. Planning permission settles whether a scheme may be built. Building Regulations approval settles whether it is built properly. Clearing one leaves the other untouched.
Area We Cover
Send the address and the constraints come back first
Send us the address. What you get back is the planning position, written down, ahead of any quotation.
Which conservation area covers it, and when that area was designated. Whether a direction applies, and whether it is current. What permitted development survives, if any. What the ground does across the plot. And what has been approved recently nearby.
We work across Streatham and SW16 — Telford Park, Leigham Court Road, Streatham Common, Streatham Hill, Sunnyhill Road, Park Hall Road, Streatham Vale and the streets off the High Road — with Balham, Tooting, Clapham, Herne Hill, Norwood, Gipsy Hill, Lambeth and the rest of south west London.
A survey costs you nothing. In SW16 the first thing it settles is which estate you are standing in.
