Hampstead Architecture and Planning

Haringey

Kitchen Extension Architects in Harringay

Removing the back wall of a terraced house is the moment the project is genuinely dangerous, and it is the part most owners never think about. The wall being taken out is holding up the floors above and, on a terrace, is tied into the neighbours on both sides. What replaces it has to be in place and carrying load before it comes down, and that sequence is designed work in its own right.

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The short answer

What is the risky part of a Harringay kitchen extension?

The day the back wall comes out. The engineer designs two structures — the permanent beam and the temporary needles and props that hold the house up while it is placed — and the second is where terraced houses crack, usually in the neighbour’s plaster. Get the temporary works drawn, settle where the beam lands before the kitchen is laid out, and agree a schedule of condition with the neighbours first.

Planning at a glance

Harringay

Planning at a glance in Harringay
Local planning authorityHaringey
Likely approval routeHouseholder planning application or permitted development, depending on conservation status, listing and property type — confirmed for the exact address before drawings begin
Statutory determination time8 weeks for most householder applications (13 weeks for major applications)
Where most projects startPlanning Route Review — £395 inc. VAT, credited in full against your package if you proceed. Find my package →

The engineer designs two structures, not one. The permanent structure is the beam that will carry the rear wall and the floors above it once the wall is gone, sized for the loads and bearing onto padstones that spread the force into the remaining masonry. The temporary structure is what holds the building up while the wall is removed and the beam is placed — needles passed through the wall above the intended opening, carried on props to a solid bearing at each side, with the load transferred before a brick is touched. Both are drawings, and a contractor who treats the second as something to improvise on the day is the single largest risk on the job.

Bearing is where terraced houses catch people out. On a mid-terrace the natural place to land a beam is the party wall, which is shared with the neighbour and is often of a construction nobody has seen. Cutting a pocket into it and bearing a padstone requires notice under the Party Wall etc. Act, and the award will usually specify how it is done. Where the party wall proves unsuitable — old, thin, or already weakened by a neighbour’s own works — the alternative is a column and pad foundation inside your own plot, which changes the plan and needs to be known about before the kitchen is laid out.

Chimney breasts are the other common surprise. Removing one at ground floor leaves the breast and stack above unsupported, so it has to be picked up on a gallows bracket or, more commonly now, a beam, and the works are notifiable under the Party Wall Act where the breast is in the party wall. Removing the breast at ground and first floor while leaving the stack at roof level is a frequent request on these terraces and is entirely possible — but only as a designed solution, not as an economy.

The sequence then dictates the programme. Temporary works go in, the opening is formed, the beam is placed and packed so it is carrying before the props come out, and only then is the remaining demolition done. Rushing that order to save a week is where terraced houses crack, and the cracking usually appears in the neighbour’s plaster rather than yours — which is why the schedule of condition agreed under the party wall award before work starts is worth having, and why a competent temporary works design costs far less than the argument it prevents.

Local analysis

What matters in Harringay

What a temporary works design contains, and why it is not optional

Temporary works are the structures that exist only during construction, and on a terraced kitchen extension they carry the entire back of the house for a period of days. The design is a real engineering exercise with real inputs: the load being supported, which includes the floors, the roof and any wall above the opening; the route by which that load reaches the ground, through needles, props and sole plates; the capacity of the surface the props stand on, which on a suspended timber ground floor is frequently not adequate without spreading the load onto the ground below; and the sequence in which everything is installed and struck. A drawing showing needle positions, prop capacities and the order of operations is what a competent contractor expects to receive, and its absence is a warning sign rather than a saving. Three failures recur where it is skipped. Props are stood on a ground floor that cannot take a point load, and the floor deflects, which drops the wall above and cracks the plaster on both sides of the party wall. Needles are spaced too far apart for the masonry above to arch between them, and a section of brickwork drops. Or the permanent beam is placed but not packed tight to the masonry above before the props are struck, so the wall settles onto it and every finish above the opening cracks — the commonest of the three and the one that produces those hairline diagonal cracks over a new opening that never quite go away. None of the three is expensive to avoid. All three are expensive to remedy, and on a terrace the remedy is frequently in someone else’s house, which turns a construction problem into a dispute.

Where the beam lands, and what that decides about your kitchen

Beam bearings look like a detail and behave like a plan constraint. A steel beam spanning the full width of a Ladder house has to land on something capable of taking a concentrated load at each end, and on a mid-terrace the only masonry available is the party wall on each side. That has three consequences worth knowing before the kitchen is drawn. First, it is notifiable: cutting into a party wall to form a bearing pocket is work under the Party Wall etc. Act 1996, and the neighbour has to be served with notice, with an award usually specifying how the pocket is formed and made good. Second, the wall has to be capable of it. These are old walls, sometimes only a single brick thick at upper levels, occasionally already weakened by a neighbour’s own beam bearing a metre away, and the engineer may require the padstone to be larger, the bearing to be spread over a longer length, or the load to be taken elsewhere entirely. Third — and this is the one that reaches the kitchen layout — where the party wall cannot take the load, the alternative is usually a column carried down to its own pad foundation inside your plot. A column is not a disaster, and it can be absorbed into a run of tall units, a pantry or the end of an island, but it is very difficult to absorb into a layout that was drawn on the assumption of a completely clear opening. That is why the structural strategy should be settled before the kitchen is designed rather than after. It is also why the depth of the beam matters: it sets the finished ceiling height across the widest part of the room, and a bulkhead discovered late lands wherever it lands, which is frequently exactly where the extract hood or the tall glazing was drawn.

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Local planning

Planning & conservation context

On an undesignated house a single-storey rear extension can be permitted development under Class A, with prior approval available for a deeper one. Inside a conservation area the allowance is reduced and prior approval is unavailable. Flats need permission whatever the designation.

The structural work is governed by the building regulations rather than by planning. Part A requires the structure to be designed and executed so that loads are transmitted safely to the ground, which covers the temporary condition during construction as much as the finished building.

Excavating for foundations within three metres of a neighbouring structure and below its foundation level requires notice under the Party Wall etc. Act 1996, and so does cutting into or altering a party wall to take a beam bearing.

Inside a designation the extension is judged on how the rear of the terrace reads: the height of the new roof against the closet wing, the survival of part of the original rear elevation, and visibility from surrounding gardens.

Retaining a section of the original rear wall, so the addition reads as an addition rather than as a replacement of the back of the house, is one of the more reliable ways to make a wide opening acceptable on a designated address.

Where a chimney stack contributes to the roofline of a uniform terrace, removing the breast internally while retaining and supporting the stack above is usually the answer that satisfies both the structure and the designation.

For the wider local-authority picture — policies, timescales and application routes — see planning in Haringey.

Illustrative study — street elevation

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Architecture in Harringay: FAQs

What are temporary works and do I really need a design for them?

They are the structures that hold the building up while the wall is removed — needles through the masonry, props to a solid bearing, and a defined sequence. On a terraced house they carry the entire back of the property for days. A drawing showing needle positions, prop capacities and the order of operations is what a competent contractor expects; its absence is a warning sign, not a saving.

What goes wrong if the sequence is rushed?

Three things recur. Props stood on a suspended floor that cannot take a point load, which deflects and cracks plaster on both sides of the party wall. Needles spaced too far apart, so a section of brickwork drops. Or the beam placed but not packed tight before the props are struck, so the wall settles onto it — the source of those diagonal hairline cracks over a new opening.

Where does the beam land on a mid-terrace?

Usually on the party wall at each end, which means cutting a bearing pocket — work notifiable under the Party Wall etc. Act 1996, with an award normally specifying how it is formed and made good. Where the wall proves unsuitable, the alternative is a column on its own pad foundation inside your plot, which changes the kitchen layout.

Could I end up with a column in the middle of the kitchen?

It happens where the party wall cannot take the concentrated load. It is not a disaster — a column can be absorbed into tall units, a pantry or the end of an island — but it is very hard to absorb into a layout drawn on the assumption of a completely clear opening. That is why the structural strategy is settled before the kitchen is designed rather than after.

Can I remove the chimney breast?

Yes, as a designed solution rather than an economy. Removing a breast at ground floor leaves the breast and stack above unsupported, so it has to be picked up on a gallows bracket or a beam, and where the breast is in the party wall the work is notifiable. Removing it at ground and first floor while retaining the stack at roof level is a common and entirely achievable request.

How does the beam affect ceiling height?

Directly. The depth of the beam sets the finished ceiling across the widest part of the new room, and any bulkhead below it lands wherever the structure requires — frequently where the extract hood or the tall glazing was drawn. Sizing the beam before the kitchen layout is fixed is what prevents a redesign after the steel is ordered.

Do I need a schedule of condition?

On a terrace it is worth having. Agreed under the party wall award before work starts, it records the state of the neighbouring property so that any damage claimed afterwards can be tested against evidence rather than memory. Given that the commonest symptom of a rushed sequence appears in the neighbour’s plaster rather than yours, it is inexpensive insurance.

What does a kitchen extension architect in Harringay charge?

We publish fixed-fee packages rather than quoting a percentage before seeing the house, beginning with a route review credited against the design work if you proceed. Structural engineering is a separate appointment and we recommend it early, because the beam depth and the bearing strategy shape the kitchen layout rather than following it.

How much does a kitchen extension cost in Harringay?

Fees for kitchen extensions in Harringay follow scope, consent complexity and whether freeholder or specialist input is required. Published packages start from a fixed fee once scope is clear; council, engineer and freeholder surveyor fees are usually separate. See our packages page for current fixed-fee bands — we confirm a fee only after the address and proposed work are understood.

Discuss a kitchen extension in Harringay

Send your Harringay address, photographs of the rear elevation and the room behind it, and a note of any chimney breast you want removed. We will set out the structural strategy — where the beam can land, what it means for the layout, and what the temporary works involve — before the kitchen is drawn.

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