Hampstead Architecture and Planning

Haringey

Kitchen Extension Architects in Stroud Green

The most common disappointment in a glazed kitchen extension is not planning or cost. It is that the room turns out to be unusable on a hot afternoon and cold on a winter evening, so the family drifts back to the front of the house. That outcome is decided by glass specification, orientation and shading, and all three are settled long before anything is built.

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The short answer

How much glass should a Stroud Green kitchen extension have?

As much as the orientation will carry, specified differently on each elevation. A north-facing rear can take a great deal with no penalty. On a south or west-facing rear, keep the overhead glazing proportionate and low in solar factor, put the larger area in the vertical elevation where an overhang can shade it in summer, and shade externally rather than with blinds. That is a specification decision, not a budget one — and it is irreversible once the units are made.

Planning at a glance

Stroud Green

Planning at a glance in Stroud Green
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 →

Orientation sets the problem. A rear elevation facing north or north-east gives soft, even light all day and can take a great deal of glass with no penalty. Facing south or west, the same glazed wall admits direct sun through the afternoon and into the evening, and an uninsulated, unshaded glass box will overheat badly in June and July. The design response is not less glass but different glass in different places, and shading where the sun actually is. A survey of the sun path across the year, done at feasibility, is what tells you which of those two projects you have.

Glass specification does most of the work and costs comparatively little. A solar control coating reduces the heat admitted while keeping the light, and the two properties are specified separately — a high light transmittance with a low solar factor is what a south-facing rear needs. Overhead glazing is the strongest contributor to overheating because the summer sun is high, so a large lantern facing south is the single most effective way to make a room uncomfortable. Moving that area of glass into the vertical rear elevation, where an overhang can shade it in summer and let low winter sun in, changes the room completely.

Shading and thermal mass finish the job. A modest projection over south-facing glazing — a deep reveal, a brise-soleil, a pergola planted with something deciduous — blocks high summer sun while admitting the low winter sun that is genuinely wanted. Inside, an exposed screed or a solid floor finish absorbs heat through the day and releases it slowly, which flattens the peak. External shading works far better than internal blinds, because once the sun is through the glass the heat is already in the room.

Ventilation is the part most often specified last and needed most. A deep plan with glazing at one end needs a way to move air through it, which means openings at both ends of the room or a high-level opening that lets warm air out while cooler air is drawn in low. Part F separately requires mechanical extract at a defined rate for the kitchen itself, and a recirculating hood does not satisfy it, so a duct has to reach an external face and its route must clear the new structure. Designing the airflow and the extract together, before the layout is fixed, is what makes the finished room usable in August.

Local analysis

What matters in Stroud Green

Choosing glass by orientation rather than by budget

Glazing is usually bought as a single decision — how much, and how good — when it should be at least three decisions taken separately for each elevation of the new room. The first is light transmittance: how much daylight comes through. The second is the solar factor, sometimes called g-value: how much of the sun’s heat comes through. The third is the U-value: how much heat leaks out on a cold night. These move independently, and modern coatings let you hold light transmittance high while pushing the solar factor down, which is exactly what a south or west-facing rear elevation needs and exactly what a standard specification does not do. On a north-facing rear the priority reverses: solar gain is scarce and welcome, so a higher solar factor with the best available U-value is the right choice, and paying for heavy solar control there simply makes the room darker and greyer. Overhead glazing deserves its own decision. The summer sun is high, so a horizontal or shallow-pitched rooflight receives far more solar energy per square metre than a vertical window on the same elevation, and a large south-facing lantern is the most reliable way to build a room nobody can sit in during July. Where overhead light is wanted — and in a deep plan it usually is, because it is the only way to light the middle — specify it with a low solar factor, keep the area proportionate, and place it over the working part of the kitchen rather than over the dining table where people sit for an hour at a time. None of this adds much to the cost of the glass. It is a specification decision, not a budget one, and it is irreversible once the units are made.

Heating and cooling a room that is mostly glass

A glazed rear extension changes the thermal behaviour of the whole ground floor, and the heating design has to follow rather than being inherited from the old house. The old rear wall, once external, becomes internal, so the radiator that used to sit on it is now in the wrong place and often undersized for a room twice the volume. Underfloor heating is the usual answer and it suits the room well: it warms the floor people actually stand on, it frees the walls for joinery and glazing, and it runs at a low flow temperature, which matters if a heat pump is on the horizon. It also responds slowly, so it wants a solid floor with insulation beneath and a control strategy that anticipates rather than reacts. The cooling side should be handled without mechanical cooling wherever possible, because air conditioning in a domestic extension is expensive to install, expensive to run and an admission that the fabric was designed wrong. The sequence that works is: reduce the solar gain at the glass, shade the remaining south and west exposure externally, give the room a path for cross ventilation with a high-level outlet, and add thermal mass in the floor. Where the plan allows a door or window at the front of the house to be opened at the same time, the whole ground floor can be purged in the evening, which is more effective than any single opening in the extension. Get those four right and the room is comfortable through a London summer without a compressor.

Thinking about a project in Stroud Green?

Send the address and a short description. We will confirm the likely approval route and the drawings your project needs.

Book an Architectural ConsultationSee fixed-fee packagesor call 020 8054 8756

Local planning

Planning & conservation context

On an undesignated house a single-storey rear extension can fall within Class A permitted development, with the prior approval procedure available for a materially deeper one on neighbour notification. Inside a conservation area the allowance is reduced and prior approval is not available, so a householder application is required.

Because the determining authority here may be Haringey or Islington depending on the boundary, confirm which council and whether the address is designated before assuming which of those routes is open. Flats hold no householder permitted development rights in either borough.

Building regulations apply regardless of the planning route. Part L limits the proportion of glazing in an extension unless the design is shown to perform overall, Part F sets the mechanical extract requirement for a kitchen, and Part K governs the glass itself where it is at low level or overhead.

Inside a designation, a fully glazed rear elevation is not automatically refused, but it is assessed on how the addition reads against the historic rear of the terrace. A frameless wall of glass with a slim structural frame often sits better than a heavy patterned screen imitating period joinery.

Roof lanterns are more visible from surrounding gardens and upper windows than owners expect, so their height and profile are worth designing rather than selecting from a catalogue where the address is designated.

Retaining part of the original rear wall, so the extension reads as an addition rather than a replacement of the back of the house, is one of the more reliable ways to make a large glazed opening acceptable in a conservation area.

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 Stroud Green: FAQs

Will a glazed kitchen extension overheat?

It depends almost entirely on orientation and specification. A north-facing rear can take a great deal of glass with no penalty. A south or west-facing rear with a large lantern and standard glass will be uncomfortable in June and July. Solar control glass, external shading over the south-facing elevation and a smaller area of overhead glazing solve it at the design stage.

Are rooflights or a glazed rear wall better?

Rooflights light the middle of a deep plan, which a rear wall cannot, so most good schemes use both. But the summer sun is high, so overhead glazing gains far more heat per square metre than vertical glazing on the same elevation. Keep the lantern proportionate and low in solar factor, and place it over the working part of the kitchen rather than over the dining table.

Does a conservation area rule out a lot of glass?

No, but it changes how the addition should read. A slim, frameless glazed opening usually sits better against a historic rear elevation than a heavy screen imitating period joinery, and retaining part of the original rear wall so the extension reads as an addition is one of the more reliable ways to make a large opening acceptable. Lantern height and profile are worth designing rather than selecting.

Do I need permission for the extension itself?

It depends on the designation and on which council determines the address, which here may be Haringey or Islington. On an undesignated house Class A covers a single-storey rear extension and prior approval allows a deeper one on neighbour notification. Inside a conservation area the allowance is reduced and prior approval is unavailable. Flats need permission in either borough.

How should the room be heated?

Usually with underfloor heating rather than the inherited radiator, which after the extension sits on what is now an internal wall and is undersized for the larger volume. Underfloor heating warms the floor, frees the walls for glazing and joinery, and runs at a low flow temperature that suits a future heat pump. It needs a solid insulated floor and a control strategy that anticipates rather than reacts.

Can I avoid air conditioning?

In almost every case, yes, and it is worth doing. Reduce solar gain at the glass, shade south and west exposure externally rather than with internal blinds, give the room a cross-ventilation path with a high-level outlet, and put thermal mass in the floor. Opening the front of the house at the same time lets the whole ground floor purge in the evening, which beats any single opening.

What about the extractor?

Part F requires mechanical extract at a defined rate for a kitchen and a recirculating hood does not meet it, so a duct must reach an external face. On a mid-terrace the rear elevation is the only route and the run has to clear both the structural beam and any rooflights. Working the duct route out before the layout is fixed avoids a hood that cannot be installed where it was drawn.

What does a kitchen extension architect in Stroud Green charge?

We publish fixed-fee packages rather than quoting a percentage before seeing the house, starting with a route review credited against the design work if you proceed. That review confirms the determining council and the designation, and includes a sun path assessment for the rear elevation, because orientation decides the glazing specification. Structural engineering and council fees sit outside it.

How much does a kitchen extension cost in Stroud Green?

Fees for kitchen extensions in Stroud Green 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 Stroud Green

Send your Stroud Green address, photographs of the rear elevation and a note of which way the garden faces. We will run the sun path across the year, recommend a glazing specification by elevation, and confirm the designation and determining council before design work starts.

Book an Architectural ConsultationEstimate the feesor call 020 8054 8756
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