Extension Architecture

Somewhere in a Victorian terrace on the north side of Clapham Common, a client walks up two flights of stairs, opens a set of French doors, and steps out onto a private roof terrace with morning coffee in hand. It's a small ritual. It didn't exist eighteen months ago. That daily moment is the outcome of a project completed in late 2024 at 92C Clapham Common. What used to be a cramped, unused attic in a period property is now a master bedroom suite with a walk in wardrobe, ensuite bathroom, and an outdoor terrace enclosed by frameless glass balustrades. The full architectural process and planning route on this particular set of Clapham loft conversions shows how a project of this shape gets past Wandsworth conservation officers without compromising the design intent. The Attic That Was Waiting Most Victorian terraces in Clapham North have an underused space at the top. Steep pitched roofs, small dormers, tiny storage rooms with limited headroom. The floor plate is often gen...

Every architect working in South London learns the same lesson around their tenth Victorian project. The houses look generous from the street and live like rabbit warrens inside. Small rooms. Load bearing walls everywhere. Kitchens trapped at the back. A family in Streatham came to us with one of these terraces. They wanted an open plan kitchen, dining and living zone for entertaining. They also wanted the original marble fireplace and the curved front room walls untouched. Project snapshot Location: Streatham, London Borough of Lambeth Existing footprint: 83.55 sqm Proposed footprint: 94.40 sqm Added floor area: 10.85 sqm Project type: Single storey wraparound + interior design If you want the full architectural pack for this scheme, Double storey wraparound extension   document the local council submission, the structural design and the interior layout from start to finish. The Structural Puzzle of a 19th Century Layout Victorian terraces were built with internal wal...

  Most people start a double storey extension thinking it's basically a single storey job with another floor stacked on top. That's the bit that gets expensive fast. The second floor changes everything about how the build sits on your existing house, how it feeds into the planning conversation, and how much your architect needs to think about before a single line gets drawn. We see this pattern a lot. A family in Wandsworth or Putney rings up after speaking to a builder, already convinced they know the scope. Then we walk through the structural side, the planning side, the layout shift that happens upstairs, and the room they planned suddenly looks very different. If you want a feel for how these jobs come together properly on the ground, our double storey extension in surrey shows the full process the way we run it for clients, from first sketch through to the finished build. Why a Double Storey Extension Isn't Just a Bigger Single Storey Job A single storey extensio...

Extension Architecture has been based at 231 Roehampton Lane in SW15 for years, and that physical presence in Putney shapes how we work in a way that firms based elsewhere simply cant replicate. We know which streets carry Article 4 Directions. We know how Wandsworth Council reads submissions from this specific corner of the borough. And we know what the Victorian and Edwardian terraces across SW15, SW18, and SW19 can realistically become when the planning process is handled properly. Forty four completed projects across Putney, a 98% planning approval rate, and around 60 active applications with Wandsworth Council at any given time. If youre looking for a Putney residential extension architect who genuinely knows this ground, that combination of local presence and project track record is what real expertise looks like. Why Article 4 Directions Are the First Thing We Check in SW15 Many homeowners in Putney start the extension process assuming their project falls within permitted dev...

Southwark is one of those London boroughs that surprises people who only know it from the outside. The Shard, Borough Market, the Tate Modern, these are the things people associate with it. But the residential streets of Peckham, Dulwich, Camberwell, Bermondsey, and Herne Hill tell a different story, one of Victorian and Edwardian terraces, 1930s properties, and homeowners who have chosen this part of south London deliberately and arent planning to leave. When those homes stop working for the families they house, extending is almost always the better answer to moving. At Extension Architecture, weve completed 44 projects across Southwark, covering SE1, SE5, SE15, SE16, SE17, SE21, and SE22. If youre looking for a Southwark home extension architect with a genuine track record in this borough, that experience is what real local knowledge looks like. The Dulwich Village Conservation Area and Why It Changes Everything The Dulwich Village conservation area is the planning consideration t...

Kingston upon Thames sits in one of the most sought after parts of outer London, and the homeowners here know exactly what they have. Good schools, a proper town centre, the river, and housing stock that ranges from Victorian terraces to substantial Edwardian semis and larger detached homes in the quieter residential streets. When a Kingston property stops working for the family it houses, moving rarely feels like the obvious answer. Improving does. And finding a good Kingston home extension architect who understands both the local planning environment and what these specific properties can realistically become is where that improvement actually starts. Kingston sits within the Royal Borough of Kingston upon Thames, which shares planning responsibilities with Richmond residential architects and brings its own specific expectations to how residential applications get assessed. What the Royal Borough Expects From Planning Applications The Royal Borough of Kingston upon Thames has clea...

Most people in Clapham start thinking about an extension and immediately picture the finished result. Open plan kitchen, bifold doors, morning light coming through a roof light over the dining table. That image is completely achievable. What's less visible, and what causes most of the problems on these projects, is everything that needs to happen correctly before a single wall comes down. At Extension Architecture we've worked with enough Clapham house extension specialists to know that the projects which go wrong almost always trace back to decisions made in the first few weeks, not the last few months. Clapham sits within Lambeth, and Lambeth Council has specific expectations around how rear extensions affect neighbouring properties. Getting those expectations wrong at the design stage means getting them wrong at the planning stage, which means delays, redesigns, and costs that shouldnt have happened. The Lambeth Overlooking Problem That Catches People Out Lambeth plannin...

Reigate has a character that takes people by surprise. The town sits at the foot of the North Downs, it has a genuine high street that still functions properly, and the housing stock ranges from substantial Victorian villas near the town centre to interwar semis in the quieter residential streets and larger detached homes in the villages that fall within the borough boundary. Banstead, Redhill, Horley, Tadworth, Kingswood, all of these sit within the same planning authority, and each has its own character that Reigate and Banstead Borough Council reflects in how it assesses planning applications. Finding a residential architect in Reigate who understands these distinctions rather than treating the whole borough as one uniform planning environment is what gives a project the best possible start. What Reigate and Banstead Borough Council Actually Focuses On The council here has a clear set of priorities when assessing residential extension applications. How a proposal relates to the e...

Most extension briefs in Epsom ask for the same thing. Knock through, open it up, create one big space for cooking and living and eating. A couple in Epsom, planning their home for retirement and for the extended family who would visit, asked for the opposite. Their brief specifically wanted to avoid open plan kitchen and living spaces. Instead, they wanted expanded living areas, a new family bathroom, a bedroom that could adapt as their needs changed, an office that doubled as a music room, a snug, and a reconfigured garden. Working with a residential architect in Epsom who actually listens to a brief like that, rather than defaulting to the standard solution, is what produced a home that genuinely fits how this particular couple wanted to live. The house, a detached property at the end of a cul-de-sac overlooking Roseberry Park, was originally developed in the 1950s. The new wing was designed specifically to chase the afternoon sun at the back of the garden, a detail that came from ...

That number is not a typo. Richmond upon Thames has 59 designated conservation areas, more than almost any other London borough. When you consider that the borough also contains Richmond Park, Kew Gardens, Ham House, and stretches of Thames riverside that are among the most protected landscapes in Greater London, the level of planning scrutiny applied to residential extensions here starts to make complete sense. This is not a borough where a standard approach to planning will get you very far. Finding residential architects in Richmond who understand this from the very beginning is what separates a project that gets approved from one that generates rounds of amendments and delays. At Extension Architecture, we've worked across Richmond and know exactly what the borough's planning department looks for and where the complexity lies. The Edwardian Renovation That Got Everything Right A recently completed project in Richmond involved a substantial Edwardian home that needed both...

In Godalming, two families living in adjoining semi detached homes both wanted to extend. When they each approached the process separately, it became clear that two individual applications would likely fail because of right to light issues between the properties. The solution their architect proposed was a joint planning application, both extensions designed and submitted together, which resolved the right to light concern and got both projects approved. That story is worth knowing if you're looking for a local architect in Surrey because it shows something important. The best outcomes here often come from thinking about problems differently, not just applying standard solutions to standard situations. Surrey throws up these kinds of complexities more often than people expect, and having an architect who thinks creatively within the planning framework is genuinely valuable. Why Right to Light Matters More in Surrey Than People Realise Right to light is a legal principle that gi...

There's a stretch of land near the river in Harrow where the ground holds water longer than most people realise. A family planning a basement extension there had their design nearly go ahead without anyone checking the flood history of the site. It was only when a residential architect Harrow homeowners had been recommended actually looked into the local drainage records that the issue came up. The basement depth was adjusted, additional waterproofing was specified, and what could have been a very expensive mistake became a manageable design decision instead. That story sticks with us because it's such a clear example of something people dont think about when choosing an architect. It's not just about drawings and planning applications. It's about knowing things about the local area that dont show up on a site visit unless someone is specifically looking for them. The Things a Local Architect Notices That Others Dont Harrow has been inhabited for a very long time, an...

Most homeowners in Barnet start thinking about an extension and immediately focus on size. How many metres can we go back? Can we add a second storey? How much extra floor area will this give us? Those are reasonable questions, but they're not the questions that determine whether a Barnet extension gets approved or refused. The questions that actually matter in this borough are considerably more specific. What does the roof form look like relative to the original house? Does the brick match closely enough? Is the side gap being maintained or lost? How does the proposed extension affect the outlook from the neighbouring property? At Extension Architecture, we've worked across Barnet long enough to know that the details are where this borough's planning decisions get made. Finding the right architect in Barnet team means finding someone who understands that before a single measurement gets taken. Why Barnet Council Focuses on What It Focuses On Barnet is one of London...

Walk into a well extended Victorian terrace in SW11 and you know it immediately. The space feels generous without feeling added on. The light comes from somewhere unexpected. The kitchen and the garden exist in the same visual world rather than being separated by a wall and a small window. There's a coherence to it that's hard to describe but immediately felt. Then walk into a poorly extended one. Same street, same property type, similar budget. But something is off. The new space feels like it belongs to a different building. The roof light is in the wrong place. The materials dont quite match. The staircase to the loft lands in the most inconvenient possible location on the first floor. The difference between those two outcomes is almost entirely down to who was involved at the design stage. Finding the right battersea architects team is what determines which version of the project you end up with. The Material Question Nobody Takes Seriously Enough Battersea's Victo...

  Ten years ago Walthamstow was a different place. The market was there, the William Morris Gallery was there, the bones of something good were clearly visible. But the wave of investment, the restaurants along Hoe Street, the creative crowd that moved in after being priced out of Hackney, the transformation has been significant and most people who bought here early know exactly how well that decision has aged. Property values have climbed steadily, the area continues to improve, and homeowners who once thought they might move on in a few years are now thinking about how to make the house work properly for the long term. That's where a good architect Walthamstow conversation usually begins. Not with grand ambitions, but with the simple frustration of a kitchen that doesnt work, a loft full of storage boxes that could be a bedroom, or a ground floor that feels disconnected from the garden. The Victorian Terrace Problem Walthamstow is full of them. Long streets of Victorian terrace...