Hampstead Architecture and Planning

Westminster / Camden

Kitchen Extension Architects in Regent's Park

A kitchen extension around Regent's Park is really two different projects depending on the building. In a mansion block or managed apartment, moving or extending a kitchen means cutting structural openings, relocating a wet area, and rerouting drainage and risers that other flats depend on, so the freeholder's Licence to Alter process leads. In a park-edge terrace or townhouse, a kitchen extension is more often a rear or lower-ground addition, where a lightwell, a section against the garden and visibility from a formal street set the design. We split the brief along that line from the first conversation rather than writing one generic kitchen scope for both.

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Practice leadership

Eyal Moran, Director and Lead Architect, is an ARB-registered architect, leading design judgement, planning strategy and technical coordination across client projects.

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The short answer

Can you extend or relocate a kitchen around Regent's Park?

Yes, but the route depends on the building. In a mansion flat, a kitchen relocation needs a freeholder Licence to Alter covering structural openings, drainage and fire stopping. In a park-edge house, a rear or lower-ground kitchen extension needs a planning strategy addressing garden depth, daylight and any light well visible from the street.

Planning at a glance

Regent's Park

Planning at a glance in Regent's Park
Local planning authorityCamden and Westminster (the historic St Pancras/St Marylebone boundary runs through the area)
Postcode districtNW1
Conservation areaRegent's Park Conservation Area — appraisal adopted 2011
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)
Typical drawing package£395–£4,950 inc. VAT, fixed fee. Find my package →

Start with the mansion-flat case, because it is the more common kitchen brief around Regent's Park given how much of the local stock is leasehold apartments rather than whole houses. Moving a kitchen within a flat, or extending it into an adjoining room, usually means cutting a structural opening in a floor slab or internal wall that other flats above and below rely on, and relocating a sink or hob changes where waste and supply pipes run through risers shared with neighbours. None of this is a council planning matter in the first instance; it is a freeholder matter, assessed through a Licence to Alter, and the freeholder's surveyor will want structural calculations, a drainage strategy and evidence of how noise and fire separation are maintained before consent is given, often well before any building work is priced.

That Licence to Alter process runs on its own timetable and its own evidence set, separate from any council planning application and separate again from building regulations approval. A freeholder's technical check typically wants to see how a new structural opening is supported, how an acoustic floor build-up compensates for lost mass where a slab is cut, and how fire stopping is reinstated around any new penetration for pipework or ductwork. We prepare that package specifically for the managed-flat audience rather than assuming the drawings produced for a planning submission will also satisfy a freeholder's surveyor, because the two audiences are asking different questions of the same design, and a package built for one rarely answers the other without rework.

The townhouse and park-edge terrace case is a different technical problem, even though the word 'kitchen extension' sounds the same. Here a kitchen extension is more often a rear single-storey addition or a lower-ground kitchen opening onto a light well, and the question shifts from freeholder consent to garden depth, daylight to neighbouring windows and how a below-ground kitchen gets natural light and safe means of escape. A lower-ground kitchen usually depends on a light well or sunken area at the back or side of the house, and the size, depth and railing treatment of that light well is itself a design and planning consideration, particularly where it is visible from a formal street frontage rather than tucked away in a rear garden.

Because Regent's Park's park-edge streets are treated as a detail-sensitive setting by both Camden and Westminster material, even a kitchen extension that sits below ground or at the rear can draw scrutiny through its street-visible elements: a new railing around a light well, a rooflight or vent at pavement level, or altered brickwork on a rear return glimpsed from a side passage. We treat those details as part of the planning submission rather than an afterthought resolved on site, because they are often what a case officer or conservation adviser looks at first, well before they consider the kitchen layout itself.

Structure sits underneath both versions of the brief, though the load path is different in each. A rear or lower-ground kitchen extension on a terrace usually needs new foundations close to the existing house and, if it steps below the damp-proof course, waterproofing designed to current guidance for habitable below-ground space. A kitchen extension within a mansion flat instead needs the existing slab and its supporting structure understood before any opening is cut, because floor loadings, fire compartmentation between flats and the position of existing risers are all fixed by the building's original design, not by what the new kitchen layout would prefer, and a structural engineer's input is not optional in either case.

Sequencing differs between the two routes as well. For a flat, we typically progress the Licence to Alter evidence alongside any planning input needed for street-visible elements, then move to building regulations once the freeholder's surveyor has confirmed the structural and drainage approach, so that construction pricing is not built on an unapproved assumption. For a house, we usually settle the planning strategy for the extension and its light well first, because that decides the footprint and depth, then develop the structural and waterproofing detail for building regulations and tender. In both cases the Party Wall etc. Act 1996 is checked early, since kitchen structural openings very often sit close to a shared wall in either building type, and notices take time to serve and respond to.

Local analysis

What matters in Regent's Park

Kitchen relocation in a mansion flat: the Licence to Alter route

Where a kitchen sits within a mansion block or managed apartment, the freeholder's Licence to Alter is usually the process that decides whether the project can proceed at all, and it asks different questions from a council planning officer. A surveyor acting for the freeholder wants to see how a new structural opening in a slab or wall is supported, how drainage and waste pipework are rerouted through risers other flats depend on, how an acoustic floor build-up compensates for any lost mass, and how fire stopping is reinstated around new penetrations for pipes, ducts and any new extraction route to an external wall. We prepare that evidence as its own package, timed to run alongside rather than after the design, because a Licence to Alter that stalls late in a project is one of the most common causes of delay in flats around Regent's Park, and because a freeholder's surveyor can reasonably ask for revisions once concealed structure is opened up and its true condition understood on site. Where several flats in the same block have made similar changes over the years, we also ask what precedent the freeholder holds on file, since an established pattern of consented kitchen openings can make a new application faster to assess than a genuinely novel one.

Rear and lower-ground kitchen extensions on park-edge terraces

On a park-edge terrace or townhouse, a kitchen extension usually means either a rear single-storey addition opening onto the garden or a lower-ground kitchen relying on a light well for daylight and means of escape. The rear addition is judged mainly on garden depth, roof form and daylight to neighbouring windows using the established BRE tests. The lower-ground option adds a further layer: the light well's footprint, depth and railing treatment sit at pavement level on a formal residential street, so its design is part of the planning conversation, not a detail resolved once the kitchen layout is fixed. Where the two options meet — a lower-ground kitchen that also steps out under a rear extension above — the section has to resolve daylight, structure and waterproofing together rather than as separate drawings produced by separate people. Garden depth on these plots varies considerably even between neighbouring houses, so a projection that reads as modest next door can still be an over-development on a shorter plot, which is why we measure rather than assume. We test both options against the specific garden and street before recommending which route the house can support.

Drainage, risers and acoustic floors: the structural reality behind a new kitchen

A kitchen is the single most services-intensive room in most homes, so relocating or extending one is rarely just a layout exercise. In a flat, moving a sink or hob changes where waste and supply pipes run through a shared riser, and cutting a structural opening in a floor slab changes both the load path and the fire and acoustic separation between flats above and below — separation that building regulations and, usually, the freeholder's lease both require to be reinstated to at least the standard it replaces. In a house, a rear or lower-ground kitchen extension needs new foundations close to the existing building and, where it drops below the damp-proof course, waterproofing designed to current guidance for habitable below-ground space, coordinated with drainage falls that still need to reach the existing run. We treat drainage, structure, acoustics and waterproofing as one coordinated technical package rather than four separate afterthoughts, because in a kitchen they are rarely independent of each other, and a change to one nearly always moves the other three. We ask for this coordination at concept stage, not once a contractor is on site and has already opened up the existing floor or wall, because late discoveries about riser routes or foundation depth are what turn a fixed-fee kitchen project into a series of costly variations.

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Local planning

Planning & conservation context

The historic St Pancras/St Marylebone boundary runs through Regent's Park, so a kitchen extension can fall to either Camden or Westminster depending on the exact address, with the western side generally in Westminster and Camden controlling other parts. Addresses close to Prince Albert Road, Park Road, Marylebone Road, or the edge of Camden are the ones where this most often needs checking before any planning strategy is set, and the correct authority should always be confirmed for the specific property rather than assumed from a neighbouring street.

For a house, a single-storey rear or lower-ground kitchen extension may in principle fall under permitted development, but those rights are commonly restricted or removed on conservation-area land, and where an Article 4 direction applies to the specific address it can remove them further still — no such direction has been confirmed for Regent's Park in the sources we hold, so this must be checked address by address rather than assumed either way. Where permitted development does not apply, a householder planning application is the route, and these are typically determined in around eight weeks. For a flat, planning permission is usually a smaller part of the picture than the freeholder's own consent process.

Kitchen works that open structure or move drainage close to a shared or party wall bring the Party Wall etc. Act 1996 into play, whether that wall separates two houses or two flats within one block. Building on the line of junction, or excavating within three or six metres of a neighbouring structure or foundation, triggers a notice period that runs independently of planning and of any freeholder sign-off, so we sequence it alongside both rather than after them.

Camden records the Regent's Park Conservation Area appraisal and management strategy as adopted in 2011, and Westminster maintains its own separate conservation material covering the park edge. Where a kitchen extension is visible from the street — a rear addition glimpsed from a side passage, a lightwell grille in the pavement, or new railings around a lower-ground light well — that visibility is assessed against the formal, park-edge character both authorities describe, even though the kitchen itself sits at the rear or below ground.

Westminster's material identifies more than 300 listed buildings within the Regent's Park Conservation Area, described generically as terraces, villas, gates, railings, lamp posts, statues and bridges rather than as a specific list we hold for individual addresses. Where a kitchen extension is proposed on or near a listed terrace or villa, listed building consent may be required in addition to planning permission, and the listing entry and its extent should be checked for the exact property before design begins.

Illustrative study — street elevation

Services

Architectural services in Regent's Park

Leasehold & Licence to Alter

Nearby

Nearby Kitchen Extension Architects pages

Kitchen Extensions in MaryleboneKitchen Extensions in Primrose HillKitchen Extensions in Camden TownKitchen Extensions in St John's WoodKitchen Extensions in Maida Vale

Architecture in Regent's Park: FAQs

Do I need planning permission for a kitchen extension in Regent's Park?

It depends on the building. For a house, a rear or lower-ground kitchen extension may fall under permitted development in principle, but conservation-area status and any Article 4 direction can restrict that, so a householder application to Camden or Westminster is often needed. For a flat, planning is usually a smaller issue than the freeholder's own Licence to Alter process.

What is a Licence to Alter and why does my kitchen need one?

A Licence to Alter is the freeholder's own consent for structural or service changes within a leasehold flat, separate from council planning. Moving a kitchen usually means a new structural opening and relocated drainage or risers, which affect the building and other leaseholders, so the freeholder's surveyor reviews structural, drainage, acoustic and fire evidence before granting consent.

Can I move my kitchen to a different room in a mansion flat?

Often yes, but moving wet areas within a flat means rerouting waste and supply pipework through risers that other flats share, and it usually requires a structural opening in the slab or a wall. That combination is exactly what a Licence to Alter is designed to test, so we prepare drainage and structural evidence for the freeholder's surveyor alongside the design.

Is Regent's Park in Camden or Westminster for planning purposes?

Both authorities have areas here, split roughly along the historic St Pancras/St Marylebone boundary, with the western side generally in Westminster and Camden controlling other parts. Addresses near Prince Albert Road, Park Road, Marylebone Road or the edge of Camden are the ones most likely to need checking, so we confirm the correct authority for your address first.

Can I add a lower-ground kitchen with a light well?

It can be feasible, but it needs testing rather than assuming. A below-ground kitchen depends on a light well or sunken area for daylight and escape, and the light well's size, depth and railing treatment can itself be a planning and street-visibility consideration on a formal, park-edge frontage. We assess this as a feasibility study before committing to a footprint.

Will the conservation area stop my kitchen extension?

No, but it raises what gets checked. The Regent's Park Conservation Area appraisal, adopted by Camden in 2011, places weight on the formal street setting, so street-visible elements of a kitchen extension — a light well railing, a rear return glimpsed from a passage, altered brickwork — are assessed even though the kitchen itself sits at the rear or below ground.

Do I need a structural engineer for a kitchen extension?

Yes, in both the flat and the house case. A flat needs the existing slab, its supports and fire compartmentation assessed before any opening is cut; a house needs new foundations and, where the kitchen sits below the damp-proof course, waterproofing design. We coordinate a structural engineer as part of the drawing package in either scenario.

Does the Party Wall Act apply to a kitchen extension?

Very often. A structural opening or new foundation close to a shared wall — whether that wall separates two houses or two flats in one block — can trigger the Party Wall etc. Act 1996. It runs independently of both planning and any freeholder Licence to Alter, so we identify notifiable neighbours early to avoid delaying the works.

Is my building listed, and does that affect a kitchen extension?

Westminster identifies more than 300 listed buildings within the Regent's Park Conservation Area, described as terraces, villas, gates, railings, lamp posts, statues and bridges rather than a list we hold for individual addresses. If your property is listed, listed building consent may be needed alongside planning, so the listing entry should be checked for your exact address before design begins.

How much does a kitchen extension in Regent's Park cost?

It depends heavily on which route applies — a flat's Licence to Alter and structural opening is a different scope from a house's rear or lower-ground extension. Our published packages start from a fixed fee, confirmed once the scope and building type are clear, and exclude council fees, freeholder or party wall surveyor costs, and structural engineering fees.

Discuss a kitchen extension near Regent's Park

Tell us whether your kitchen project is in a house or a managed flat, and share your address. We will confirm whether Camden, Westminster or your freeholder's Licence to Alter process leads, assess the structural and drainage constraints, and set out the design, approvals and drawings the project needs.

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