Which postcode districts around Kensington and Chelsea do we cover for building regulations package work?
Building regulations approval is a separate consent from planning permission, granted by a building control body rather than by the planning department, and one does not imply the other. That distinction does more work in this borough than almost anywhere, because 62.6% of Kensington and Chelsea's 89,250 dwellings were built before 1900 — the highest share of any London borough and well ahead of Hammersmith and Fulham on 48.1% (VOA council tax stock by build period at 31 March 2025, retrieved 1 September 2026). The table below gives each postcode district and the planning authority that determines an application there; the fees are the statutory England planning rates for 2026.
| Postcode | Area | Dominant stock | What it means for a building regulations package |
|---|
| W8 | Kensington | Stucco terraces, listed buildings | Kensington sits inside W8. The Building Regulations check can be bought from RBKC Planning building control or from a private approved inspector — the owner chooses, and the choice is not tied to the borough boundary. |
| W10 | North Kensington / Ladbroke Grove | Victorian terraces, post-war estates | North Kensington / Ladbroke Grove sits inside W10. The Building Regulations check can be bought from RBKC Planning building control or from a private approved inspector — the owner chooses, and the choice is not tied to the borough boundary. |
| W11 | Notting Hill / Holland Park | Victorian stucco terraces | W11 covers Notting Hill / Holland Park only; RBKC Planning handles the building regulations package. |
| SW1X | Knightsbridge / Belgravia | Regency stucco terraces, listed buildings | Knightsbridge / Belgravia is split at SW1X. Either Westminster City Council or RBKC Planning can determine a building regulations package here, so the SW1X address is checked against both policies maps first. |
| W14 | West Kensington / Barons Court | Victorian and Edwardian villas | W14 straddles the borough line at West Kensington and Barons Court, so a building regulations set from a W14 address falls to RBKC in some streets and to Hammersmith and Fulham in others. The address goes onto both policies maps before a single line is drawn. |
| SW3 | Chelsea / Brompton | Georgian and Victorian terraces, listed buildings | Chelsea / Brompton is inside SW3. Building control is not a council monopoly: an approved inspector can take the same job, discharging the same duty under the Building Regulations, wherever the address sits. |
| SW5 | Earl's Court | Stucco terraces, Edwardian mansion blocks | SW5 covers Earl's Court only; RBKC Planning handles the building regulations package. |
| SW7 | South Kensington / Knightsbridge | Stucco terraces, mansion blocks, listed buildings | SW7 straddles a boundary: South Kensington / Knightsbridge addresses fall to RBKC Planning or Westminster City Council, so confirm which authority validates the building regulations package before submitting SW7 drawings. |
How does a building regulations package differ street by street across Kensington and Chelsea?
Nearly two-thirds pre-1900 means solid walls, timber floors and, on the stucco terraces, four or five storeys reached by a single stair. Three regulations follow from that geometry before anyone opens a drawing. A dwelling of three storeys or more needs a protected stairway, which decides where doors and glazing can go. A solid wall has no cavity to fill, so any thermal upgrade is internal or external and both change the room or the elevation. And on the narrow plots typical of Chelsea and South Kensington, ventilation and daylight to a rear room have to be resolved against a light well rather than a garden. The neighbourhoods below are grouped by which of those constraints leads.
- Chelsea (SW3, SW10) — a building regulations package in Chelsea starts from georgian and victorian terraces, listed buildings, and Chelsea reads as Georgian and Victorian terraces, riverside. Georgian solid walls here cannot take standard cavity detailing in SW3. RBKC Planning assesses Chelsea building regulations drawings against its own Chelsea character guidance, and the location plan we draw for Chelsea references King's Road.
- Notting Hill (W11) — stucco terraces, painted facades defines Notting Hill, where victorian stucco terraces set what a building regulations package can do. Victorian solid brickwork here drives the Part L strategy and the Part C damp detailing across W11. Any Notting Hill building regulations package is validated by RBKC Planning, with Portobello Road the usual Notting Hill reference point on the site plan.
- Holland Park (W11, W14) — building regulations package work in Holland Park means victorian and edwardian villas. Holland Park is Victorian villas around the park. Victorian solid brickwork here drives the Part L strategy and the Part C damp detailing throughout W11. RBKC Planning decides the Holland Park application, and Holland Park anchors the Holland Park location plan.
- Earl's Court (SW5) — Victorian stucco terraces, mansion blocks defines Earl's Court, where stucco terraces, edwardian mansion blocks set what a building regulations package can do. Edwardian houses here are usually early cavity or solid wall across SW5. Any Earl's Court building regulations package is validated by RBKC Planning, with Earl's Court station the usual Earl's Court reference point on the site plan.
- South Kensington (SW7) — building regulations package work in South Kensington means stucco terraces, mansion blocks, listed buildings. South Kensington is Victorian and Edwardian stucco terraces. Mansion blocks here are covered by Part B compartmentation rules that apply across the whole building throughout SW7. RBKC Planning decides the South Kensington application, and V&A anchors the South Kensington location plan.
- Knightsbridge (SW1X, SW7) — building regulations package work in Knightsbridge means regency and victorian terraces, mansion blocks. Knightsbridge is Regency and Victorian terraces, luxury. Victorian solid brickwork here drives the Part L strategy and the Part C damp detailing throughout SW1X. RBKC Planning decides the Knightsbridge application, and Harrods anchors the Knightsbridge location plan.
- North Kensington (W10) — a building regulations package in North Kensington starts from victorian terraces, post-war estates, and North Kensington reads as Victorian terraces, post-war estates. Victorian solid brickwork here drives the Part L strategy and the Part C damp detailing in W10. RBKC Planning assesses North Kensington building regulations drawings against its own North Kensington character guidance, and the location plan we draw for North Kensington references Golborne Road.
What local planning policy applies to a building regulations package in Kensington and Chelsea?
Where heritage and the regulations meet: the council decided 1,533 applications to alter or extend a listed building in the twelve quarters to March 2026 and granted 1,401 — 91.4%, and the second largest heritage caseload in London after Westminster (MHCLG planning statistics, retrieved 1 September 2026). On a listed building the two consents pull against each other: the regulations want insulation, airtightness and a protected escape route, and listed building consent protects the very surfaces and joinery those things attach to. The Approved Documents anticipate the conflict, allowing a proportionate approach where full compliance would unacceptably alter a building of historic interest. That is a case to be argued and evidenced in the submission, not a box to tick, and it is best argued once, in a package written for both consents at the same time.
Fire and escape on a tall narrow house: the stucco terraces of Chelsea and South Kensington run to four and five storeys on a plan barely wider than the stair. Once a dwelling reaches three storeys, the stair has to be protected along its whole length, with fire-resisting construction and self-closing doors to every habitable room off it. In an open-plan refurbishment — which is what most owners here actually want — that single requirement usually decides the layout, and it is the reason a scheme that planning approves can still fail at building control. Resolve it at the design stage, on the section drawing, rather than on site.
Basements: the council's policy limits residential excavation to a single storey under no more than half the garden, and effectively rules out double-storey basements in residential streets. What follows on the construction side is a separate discipline. Ground moisture protection, the waterproofing design and its drainage, escape from a habitable basement room, and the structural design of the underpinning all have to be resolved as engineering, with a party wall award in place before work begins. Two months' notice runs to an adjoining owner for excavation near a shared wall, and on a terrace that means two neighbours, not one.
Two figures worth reading carefully: Kensington and Chelsea recorded zero larger-householder prior approvals in every one of the twelve quarters, and only 118 lawful development certificates. Neither should be read as evidence that permitted development never applies here. Most of the borough's homes are flats, to which Schedule 2, Part 1 of the Town and Country Planning (General Permitted Development) (England) Order 2015 has never applied, and a blanket zero on a national return is a recording convention as often as it is a measurement. What the return does show clearly is a council that approves what it decides — 90.6% of all applications, third highest in London — while delegating only 90.0% of them to officers, the second lowest share of the thirty-three, so a contested scheme here has a real chance of reaching committee.
Who decides a building regulations package on the edge of Kensington and Chelsea?
- Westminster — the eastern boundary, and the only London authority with a heavier heritage caseload: 4,689 listed building consents to alter or extend decided over the same three years against this borough's 1,533 (MHCLG planning statistics, retrieved 1 September 2026). Building control requirements are national and identical either side of the line. The heritage consent that runs alongside them is not, and Westminster is markedly slower — it decided 72.2% of applications in time against 96.7% here.
- Hammersmith and Fulham — the western neighbour, and the second most pre-1900 borough in London at 48.1%. Very similar construction, so the same solid-wall and protected-stair questions arise, but a far lighter listed-building caseload, which usually means the regulations package can be resolved without a parallel heritage consent.
- Brent — touched only at the northern tip around Kensal Green. Later stock and a different set of problems: cavity walls that can be filled, lower terraces that stay under the three-storey stair threshold, and correspondingly fewer conflicts between the Approved Documents and the fabric.
Sources for this Kensington and Chelsea building regulations package page: borough policies maps and
conservation-area registers (2025–26), Royal Mail postcode district boundaries,
the Town and Country Planning (Fees for Applications) (England) Regulations, the Town
and Country Planning (General Permitted Development) (England) Order 2015 as amended,
and the Party Wall etc. Act 1996.
