House Extension Southwest London Across Seven Separate Councils
Southwest London reads as one place. For planning purposes it is seven.
Richmond upon Thames, Wandsworth, Lambeth, Kensington and Chelsea, Hammersmith and Fulham, Merton, and Kingston upon Thames. Seven authorities, seven sets of policy, seven registers, and no obligation on any of them to match the others.
A homeowner in one borough can carry out work that a neighbour two miles away must apply for. Neither will find that out from a postcode.
The differences are not cosmetic either. They cover which works need an application at all, what evidence has to accompany one, which document a design is measured against, and how far a council will go to protect a garden wall or a tree. Two of the seven have changed position within the last three years.
Design And Build works across all seven. Everyone on a project here is on our payroll rather than hired per job. The determining authority gets established before a single line is drawn. What follows is what those councils publish about themselves.
The gradient nobody publishes: strict downstream, permissive upriver
Lay the seven side by side and something becomes obvious that no single council page shows.
The further upriver you go, the more of your permitted development rights survive.
In the inner boroughs, directions withdrawing householder rights are common and long-established. In the middle of the region they are patchier and sometimes contested. At the far end, in Kingston, the council has used the same power almost entirely on commercial buildings and left houses alone.
That is not a rule of thumb we invented. It is what the seven registers say when read together, and it means the answer to “can I build this” moves systematically across the map rather than randomly.
There is a reason behind it. The inner boroughs designated early, watched their stock get altered through the 1970s and 1980s, and reached for directions to stop it. The outer ones designated later, had less erosion to reverse, and have used the power sparingly. Where a council did try to tighten recently, residents have sometimes objected in numbers and the council has stepped back.
None of which helps unless you know where your address sits on that line. The gradient describes the region; only the register describes the house.
Kingston left householder rights alone and Lambeth did not
Take the two ends of it.
Kingston has aimed its directions almost entirely at commercial buildings — at the conversion of offices and shops into flats — rather than at houses. A homeowner there loses permitted development only through designation or listing.
Lambeth is the other case. Several of its conservation areas carry directions that move windows, doors, roof coverings and boundary treatments out of automatic work and into applications, and its recent decisions are dominated by exactly those items.
Between them sit the rest. Wandsworth made a direction and then withdrew it. Merton imposed one and let it lapse unconfirmed. Richmond applies them street by street rather than borough-wide, so two neighbouring roads can differ entirely.
Read Kingston, Streatham, Wandsworth, Wimbledon and Richmond and the pattern is on the page in each case.
One further wrinkle catches people out. A direction can lapse. Where one was made and never confirmed within the statutory period, it falls away entirely and the properties revert — but the original notice usually stays online, and summaries written during the window keep circulating long afterwards.
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Planning permission South West London is decided by whichever borough you are in
The practical question is never “what does south west London allow”. It is which of the seven holds your address, and what that one has published.
Planning permission is determined against a local plan, and the seven are on different cycles. Merton adopted a new plan in November 2024 with a numbered policy for householder extensions. Kingston is still working to an older strategy with a replacement in preparation. Others sit somewhere between.
Conservation area guidance diverges just as sharply. One borough writes a separate appraisal for each lettered part of a single area. Another divides one designation into fifteen numbered sub-areas. A third has written a single document covering every conservation area it has, precisely to avoid that duplication.
Designation itself is common ground, under the Planning (Listed Buildings and Conservation Areas) Act 1990. Everything downstream of it is not.
Boundary drafting differs too, and it decides individual houses. Several of the seven place their conservation area boundaries along the centres of roads or between back gardens, which means the property facing yours can sit outside the designation entirely, holding rights you do not have.
Approval rates vary as well. Across a recent four-quarter period one of the seven granted a little over ninety-two per cent of householder applications while another granted around eighty-two, against a London average close to eighty-six. The gap is not a measure of difficulty so much as of how much preparation each council expects before submission.
Two views here are protected by their own Acts of Parliament
South west London holds two protections that exist almost nowhere else in the country.
The view from Richmond Hill across the Thames is safeguarded by the Richmond, Ham and Petersham Open Spaces Act 1902, which makes it the only view in England protected by dedicated legislation rather than general planning policy. Any scheme on or near the Hill is considered against it as well as against the conservation area appraisal.
Wimbledon Common works the opposite way round. Its council lists the Common as a conspicuous gap in the designated areas, and then explains the gap: separate legislation already covers it, so designating it would have added nothing.
Both facts change what an owner on an adjoining street can argue. Richmond and Wimbledon set out each in full.
Protections of that kind are worth knowing about early, because they are invisible on a site visit and they do not appear in the ordinary constraint layers. A scheme can satisfy every conservation area test and still fail on a sightline written into statute more than a century ago.
Builders Southwest London start at the council, not the aggregator
There is a reason we check every address against the authority’s own record rather than a national lookup.
One of the seven keeps its directions solely on its own register. They are wholly absent from the national dataset, which means an automated lookup on any address in that borough comes back clean when it should not. A published planning guide has already reported that emptiness as though it proved something.
It is not the only example. Two pages on the same council website give different coverage figures for an identical list of conservation areas. Published counts for one borough vary between twenty-two and twenty-seven depending which source you read. Directions that were withdrawn years ago still appear in third-party summaries as though current.
Published planning data about this region is often wrong
The errors are not random. They cluster in three places.
Counts, because boundaries change and nobody updates the summary. Directions, because withdrawal and lapse are recorded quietly while the original notice stays online. And permitted development, because a national dataset with a gap in it reads as a borough with no restrictions.
For an owner the consequence is direct: a scheme designed against a summary can be lawful on paper and refused in practice, or the reverse. Where rights do exist, a lawful development certificate puts the position beyond argument for whoever buys the house next.
We work from what the determining authority currently publishes, checked by address, and we do it before quoting rather than after.
It takes minutes rather than days. Most of the seven now publish a constraints view against the address, an interactive map, or both, and the weekly application lists show what has recently been approved on comparable streets. Nothing about that is difficult. It simply has to be done against the right source.
House renovation Southwest London on stock from four centuries
The building stock here spans a longer range than any comparable part of London, and each period opens with a different question.
At the oldest end, medieval plot widths still govern frontages in Kingston’s historic core. Georgian and early Victorian townhouses run through Richmond, Barnes and the older river villages. The great Victorian estates fill the middle of the region, built for markedly different buyers within a generation of each other: model housing for artisans on one road and upper-class villas on the next. Edwardian and interwar suburbs cover the outer edges. And the riverside quarters are conversions and new build on former industrial ground.
Ground conditions vary as much as the architecture. Alluvium and made ground follow the river and its tributaries. Clay dominates elsewhere. Slopes at Coombe and the ground rising from Streatham High Road behave differently again.
Age brings its own pattern of problems. The oldest fabric raises questions of structure and of what previous centuries removed. Victorian estate housing turns on drainage, roof coverings and the quality of earlier alterations. Interwar stock is usually sound but rarely insulated to anything like current expectations. Converted flats bring leases and party structures into the picture before any drawing starts.
Trees run through all of it. In a conservation area, work to a tree requires permission in its own right, separately from the building work, and on a mature plot it is often the longer lead item.
Over all of it sits listed building consent, which operates on entirely separate legal ground and extends to interiors that no conservation area designation touches. The survey therefore dates the building first and measures it second. Our engineers test what the fabric will bear, and the interior designers arrive while the layout is still open.
A construction company Southwest London staffs all seven boroughs
The conventional route appoints four separate firms in sequence, each engaged when the previous one has finished. Every handover carries an assumption about what the address permits, and none of the four is responsible for testing it. Across seven authorities writing seven kinds of guidance, that is precisely where projects come apart.
We hold the whole sequence. Establishing which council decides, which conservation area and which document applies, whether a direction reaches the address and whether the building is listed — then design, the heritage case, calculations and the build, under one agreement at one agreed figure. Where neighbouring walls are affected, the Party Wall etc. Act 1996 obligations are discharged by surveyors we employ directly, in step with the application. Every trade on site is ours.
Two consents are worth separating, because owners run them together. Planning permission settles whether a scheme is acceptable in principle. Building Regulations approval settles whether it is built safely. Satisfying one does nothing for the other.
Our completed projects run across the region and beyond it.
Working across seven authorities has one practical advantage worth stating. The same team has argued a heritage case in a borough that appraises in lettered sub-areas and in one that has written a single document for everything it has designated. Knowing how a particular council reads a submission is not transferable knowledge, and it is the part that no drawing service supplies.
Area We Cover
Which of our pages already answers your address
Each area below has its own page, written from that borough’s own published record rather than a template.
Richmond upon Thames — Barnes, East Sheen and Richmond.
Wandsworth — Wandsworth, Tooting, Putney, Battersea and Balham.
Lambeth — Clapham, Streatham, Stockwell and Vauxhall.
Kensington and Chelsea — Earls Court, South Kensington, Chelsea and Knightsbridge.
Hammersmith and Fulham — Fulham. Merton — Wimbledon. Kingston upon Thames — Kingston. We also cover Vauxhall Bridge and Chelsea Bridge.
Send the address. The first thing we send back is the name of the council that decides it.
