A great deal of the worry people carry into a renovation is about permission, and much of it is misplaced. Some of the work you are imagining needs no planning permission at all. Some of it does. And a conservation area does not stop you doing things so much as it changes which things need consent and which do not. The trouble is that the four separate approvals involved — planning permission, permitted development, Building Regulations and the party wall process — get folded into one vague dread, and the dread is what delays the project. This piece separates them out.
What follows is a plain guide to the position for a typical Victorian or Edwardian terrace in East and North London, at 2026 rules. It is orientation, not a substitute for checking your own address, because the single fact that decides most of this — whether your street is in a conservation area, and whether it carries an Article 4 direction — changes from one road to the next. We check that for every house before we quote it.
The work that usually needs no planning permission
Most of what happens inside a house needs no planning permission. A new kitchen, a new bathroom, a knock-through between two rooms, a steel beam, a chimney breast removed, the whole layout reconfigured — none of that is a planning matter, unless the house is listed or has been converted into flats. So the internal remodelling that gives most terraces the open kitchen-diner people are after can often proceed without a planning application at all. It still needs Building Regulations approval, which is a different thing, covered below. But the planning worry that attaches to it is usually unfounded.
Permitted development: extending without an application
Permitted development is a set of rights that let you build certain things without applying for planning permission. For a terrace, the most useful is the single-storey rear extension. Within limits — broadly, up to three metres deep from the original rear wall, no higher than four metres, with eaves kept low near the boundary — a rear extension can often be built as permitted development. There is also a Larger Home Extension route that allows up to six metres on a terrace, granted through a prior-approval process that gives your neighbours a chance to comment first.
What permitted development does not usually cover is the more visible work. A side return that fills the alley beside the house, a two-storey extension, a loft dormer on the front, cladding or render on the elevation — these normally need a full planning application even outside a conservation area. We have written separately on extending a Victorian terrace, which walks through the options room by room. The important point here is that "permitted development" is a real, usable thing, and a good part of what people assume needs permission does not.
What a conservation area actually changes
Many East London terrace streets sit inside conservation areas, and a lot of the ones we work in do. A conservation area does not freeze a house. What it does is withdraw several of the permitted development rights above, so that work which would be automatic elsewhere now needs consent. In a conservation area, side extensions are no longer permitted development. Roof alterations and dormers are no longer permitted development. Cladding and rendering the elevation need permission. A two-storey rear extension needs permission. A single-storey rear extension within the standard limits, though, usually still is permitted development — the rights are trimmed, not abolished.
Some streets go further still. An Article 4 direction removes additional rights on top of the conservation-area position — commonly the right to change front windows and doors, to alter the front elevation, or to lay hardstanding in the front garden. Waltham Forest has a number of these. Walthamstow Village, the borough's first conservation area and its most tightly controlled, is the clearest case: it is exactly the kind of place where the front elevation, the windows and the roofline are protected, and where conservation-correct restoration matters as much as it does anywhere in London. None of this stops good work. It just means the work has to be applied for, drawn properly, and done sympathetically — which, on these houses, it should be regardless.
Building Regulations are a separate thing entirely
Planning permission asks whether you are allowed to change a building. Building Regulations ask whether the work is built safely and correctly: the structure, the drainage, the fire safety, the insulation, the ventilation. They are a different approval, run by building control rather than the planning department, and they apply to structural work whether or not planning permission is needed. A steel beam for a knock-through needs Building Regulations sign-off and inspection even though it needs no planning permission. A great many projects need Building Regulations and no planning at all. Conflating the two is one of the most common reasons people think a straightforward job is a bureaucratic ordeal when it isn't.
The party wall process
On a terrace, there is a fourth thing, and it is the one people forget: the party wall. The Party Wall etc. Act 1996 requires you to give formal notice to attached neighbours before you carry out work to a shared wall, or excavate near their foundations. The notice periods are set by the Act — two months for work to the party wall itself, one month for excavation. It is separate from planning and from Building Regulations, it applies to most extensions and many internal jobs on a terrace, and handled late it is one of the surest ways to lose weeks off a programme. Handled early, it is simply a form and a conversation.
How long the applications take
A householder planning application has a statutory determination period of eight weeks. The Larger Home Extension prior-approval route runs to a shorter clock, around six weeks including the neighbour consultation. Building Regulations run alongside the build rather than before it. The mistake is not the length of any one of these — it is starting them too late, or in the wrong order, so they stack up against the start date. That is avoidable.
How we handle it
We work out the permission position for your house before we quote it. At the first consultation we will tell you whether your project is permitted development, needs a full application, or sits in a conservation area or behind an Article 4 direction — before you have spent anything on drawings. Then we sequence the approvals: the planning route, the party wall notices, the Building Regulations, all lined up so the paperwork is done before the skip arrives. The timeline given is the timeline kept, and on a terrace that is only possible because the permissions were dealt with first, not discovered halfway through.
If you are weighing a project and you are not sure which side of the line it falls on, that is exactly the sort of thing the free first hour is for. And if the room you want turns out not to need permission at all, we will be glad to tell you so — it is usually the cheapest news we get to give. The cost side of the same decision is in our guide to what a renovation actually costs in East London, and the time side — how the planning clock adds to the programme — is in how long a renovation actually takes.
Common questions about planning permission
Do you need planning permission to extend a Victorian terrace?
Not always. A single-storey rear extension is often permitted development within limits (around 3 metres deep on a terrace, or up to 6 metres under the Larger Home Extension scheme with a neighbour consultation). Side extensions, two-storey extensions and dormers usually need a full application, and a conservation area removes several of these rights. Check the designation for your address to be sure.
Does a conservation area mean I cannot extend?
No. It removes permitted development for side extensions, dormers, cladding and two-storey rear extensions, so those need planning permission; a single-storey rear extension within the limits usually remains permitted development. Some streets carry an Article 4 direction removing further rights, such as changes to front windows and doors.
Do I need planning permission for a new kitchen or internal work?
Generally no, unless the house is listed or a flat. Internal work needs Building Regulations approval for anything structural, but not planning permission.
What is the difference between planning permission and Building Regulations?
Planning permission governs whether you can make a change; Building Regulations govern whether it is built safely. Structural work needs Building Regulations even when it needs no planning permission. They are separate approvals.