House Extension Haringey
Harringay is the part of Haringey that runs either side of Green Lanes, from Finsbury Park up to Turnpike Lane. Most of it was built in less than twenty years. In the 1880s the British Land Company bought the estate of Harringay House, which stood at the top of the hill between present-day Hewitt Road and Allison Road. It laid the land out in two halves, the Hornsey Station Estate and the Harringay Park Estate. Harringay station opened on 2 May 1885, and by 1900 the streets were full.
The result is the Harringay Ladder: parallel terraced streets between Green Lanes and Wightman Road that look like the rungs of a ladder on a map. The houses are late Victorian and up to three storeys high, with front bays, doors set back under brick arches, and carved lintels and cills. Harringay Passage runs down the middle of every rung, and it is built over a Victorian sewer. The New River, a water supply channel dug in 1613 and still run by Thames Water, crosses the western streets.
East of Green Lanes the pattern changes: Grand Parade was finished in 1899 as a single development, with larger shops and flats above. Behind it, the streets known as the Gardens were built with smaller houses.
For most of its first century, a borough boundary cut through all of this. The Victoria County History records that Hornsey’s boundary with Tottenham followed Green Lanes. In 1897 residents on the Tottenham side asked to move into Hornsey, and Tottenham refused. The two were only joined in 1965, when Haringey was formed.
Today, what shapes building work here is not the architecture. It’s who lives inside. The 2021 census counted 6,189 households in Harringay ward. Half rent privately, which is the highest share in Haringey, while more than a third live in a converted house and a quarter in a purpose-built flat. Only about three households in ten occupy a whole house. That single fact decides which rules apply to your project.
House Extensions in Haringey: Different Rules for Different Types of Home
A House on the Ladder Keeps Its Permitted Development Rights
The Ladder is not a conservation area. The council’s own character study for Green Lanes places only a small part of the St Ann’s conservation area in this neighbourhood, at its eastern edge. So if you own a whole house here, permitted development rights usually still apply.
The most common jobs on these houses are a loft conversion with an L-shaped dormer over the back addition, a side return infill beside it, and a single-storey extension into the garden. Haringey’s decisions show how often this work is lawful without an application. Certificates of lawfulness for it come back as permitted development on Ladder houses again and again. A certificate is cheaper and quicker than a planning application, and it gives you written proof when you sell.
Some builders say an Article 4 Direction covers these streets and removes those rights. That isn’t correct. The only Article 4 Direction in Harringay controls a change of use, not the size or look of an extension, as explained further down this page.
A Flat Has No Permitted Development Rights at All
A flat is different. Permitted development rights belong to houses and don’t apply to flats or maisonettes, even outside a conservation area. So any change to the outside of a flat needs full planning permission.
Haringey’s own decisions show the difference clearly: on one Ladder street, a roof addition over the back addition was confirmed as permitted development on a house. On a neighbouring street, the same kind of roof addition, applied for on a flat, was refused. A third application, for a second-floor flat, described its roof work as designed to meet permitted development limits. It still needed full planning permission, because a flat has no such limits to meet. If you own a flat, plan for a full application from the first day.
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Renovating a Victorian Haringey Terrace, Floor by Floor
Stripping Out, Then Renewing the Wiring, Heating and Plumbing
Most houses here have been changed many times, with a wall moved for a conversion, a bathroom squeezed onto a landing, or wiring from the 1970s that nobody ever replaced. A proper renovation starts by taking those layers out and finding the original house underneath.
Then the services are renewed while the floors are up: new wiring, a new heating system and new pipework, all in one sequence. Doing it together means you pay once to open up the house, not three times. Our interior designers join at this point, before any wall position is final, so the rooms, the lighting and the fitted furniture are planned as one design instead of three separate choices.
Damp in Solid Brick Walls, and Keeping the Original Sashes
These houses have solid brick walls laid in lime mortar, with no cavity. The walls need to breathe. Hard cement render, cement repointing or modern masonry paint trap moisture inside the brick. That is the cause of much of the damp in Victorian houses on these streets. The fix is usually to remove the wrong material and go back to lime.
The front of the house needs the same care, because the timber sash windows, the arched porches and the bays give each terrace its rhythm. Repairing a sash often costs less than replacing it, and where a window is past repair, a new timber sash with slim double glazing keeps the front looking right and holds its value.
Flat Renovation in Haringey, Where Most Homes Are Flats
Refurbishing a Flat Inside a Converted Victorian House
Many flats here were once a single house, divided decades ago. It often shows. Rooms have odd shapes because a wall was moved, the bathroom sits where the soil pipe happened to be, and you hear every footstep from upstairs. A good flat refurbishment starts with the layout, not the surfaces. It puts the kitchen and bathroom where they work best, renews the services properly, and deals with sound while the floors are open.
Licence to Alter, the Shared Soil Stack and Sound Between Floors
In a flat, you usually own less than you think. The structure, the outside walls and the roof normally belong to the freeholder. Structural work, or anything that affects the building, needs a licence to alter from the freeholder or managing agent. That is separate from planning permission, and you need both before work starts.
Soil stacks and risers are usually shared, so a bathroom can’t always move to where you want it, and sound insulation between floors is best done while the boards are up. Part E of the Building Regulations sets the standard for converted buildings, and fire separation between flats under Part B matters just as much.
Flats Above the Shops on Green Lanes and Grand Parade
Harringay has more homes inside commercial buildings than any other ward in Haringey. Most are flats above the shops on Green Lanes, Grand Parade and Turnpike Lane. These need extra care. The separation between the shop and the flat is a building control matter, and fire and sound protection shape the design. Access is often up one staircase, and working hours can depend on the business below. The council’s character study notes that many shop fronts here are in poor condition. A new shop front usually needs planning permission of its own.
Builders in Haringey for Landlords: Licensing, HMOs and Planning
Every Private Let in the Ward Needs a Selective Licence
Half the homes in Harringay are privately rented, and since 17 November 2022 Haringey’s selective licensing scheme has covered every private let to a single person, two people or one household in Harringay ward and in Hermitage and Gardens ward. The licence carries conditions on the condition and safety of the property, and the council can inspect.
This ward also has a long history with licensing, because when Haringey began additional licensing of shared houses in 2011, the scheme was centred on Harringay.
Turning a House Into a Shared Let Needs Planning Permission
In most of England, you can change a family house into a small shared house for three to six people without planning permission. In Harringay you can’t. Haringey made an Article 4 Direction on 30 November 2012 to remove that right, and it has applied here since 30 November 2013.
This is the Article 4 Direction mentioned earlier, and it controls the change of use from a house to a shared house. It doesn’t control extensions or the front of the house. Any application must meet Haringey’s Policy DM17, and a larger shared house also needs an HMO licence.
Refurbishing Between Tenancies to Licence Standard
A landlord usually has a short gap between one tenant leaving and the next moving in. That is when the work has to happen: a new kitchen or bathroom, rewiring, fire doors and alarms, damp repairs. We plan the job around that gap and around the licence conditions, so the property is ready to let when the work ends. Gas and electrical safety certificates come from our own Gas Safe registered and NICEIC approved team, not from a subcontractor.
What a Haringey Construction Company Should Handle for You
Planning, Building Control and Licensing: Three Separate Departments
A project in Harringay can involve three parts of the council. Planning decides what you are allowed to build, building control checks that it is built safely, and the private sector housing team runs the licences. They are separate teams with separate forms, and they don’t coordinate your job for you. A landlord refurbishing a flat between tenants may need all three. One construction company handling every consent means nothing falls between them.
Solid Brick, London Clay and the Back Addition
Most Ladder houses have a back addition: a narrower rear wing, lower than the main house. Much of the building work here attaches to it or sits on top of it. The walls are solid brick and the footings are shallow by modern standards. The ground is London clay, which shrinks and swells with the seasons, so a new foundation beside an old one must be designed for that, not simply matched to it. Our structural engineers check the bearing, size the beams and lintels, and set the foundation depth before the design is fixed.
Party Wall Notices on a Ladder Terrace
Ladder houses are terraced. There is a neighbour on each side. Most structural work here touches a party wall on both flanks. The Party Wall etc. Act 1996 sets out the notice you must give. In a converted house the floors between flats can count as party structures too, so the owners above and below may need notice as well. Our party wall surveyors identify every adjoining owner, serve the notices and agree the award.
Plans and Drawings Haringey Planning Officers Will Accept
Measured Survey, Drawings and a Certificate of Lawfulness
Every project starts with a measured survey of the building as it stands, and from that our architects draw the existing and proposed plans and elevations. For a house, the first question is whether the work is permitted development. If it is, we apply for a certificate of lawfulness, which gives you the council’s confirmation on paper before anyone starts work.
When a Flat Needs a Full Planning Application
For a flat there is no permitted development route. Anything that changes the outside needs a full application, whether it is on the roof, in the garden or in a new opening. The council judges it on its effect on neighbours, on daylight, and on how it sits within the terrace. We prepare the drawings and the supporting statement, and deal with Haringey’s planners until a decision is made.
Area We Cover
Owner, Tenant or Leaseholder: The Answer Starts There
The survey is free. It answers the questions that decide your project: whether the property is a house, a flat or a shared let, whether it sits inside the licensing zone, what the lease allows, what the structure is doing, and whether the work needs planning permission or only a certificate. You get those answers before any drawings are paid for.
After that, the design, the engineering and every consent are handled by our own team, and our own trades build it under one contract. The job closes with building control sign-off, the certificates and warranties, and a written guarantee. We work across Harringay — the Ladder, Green Lanes, Grand Parade and the Gardens — and across Crouch End, Hornsey, Wood Green, Finsbury Park, Muswell Hill, Tottenham and the rest of north London.
Whether you live in the property, let it or lease it, the first step is the same: a free survey and a straight answer on what the rules allow.
