Dormer, hip-to-gable and mansard loft conversion drawings for Kensington and Chelsea homes — prepared to the Royal Borough of Kensington and Chelsea's design guidance, delivered in days and revised free until your decision lands, with a free approval-odds score first.
the Royal Borough of Kensington and Chelsea granted 85% of the householder planning decisions it made in its latest published year — 2 points below the 87% England-wide householder average. The borough runs the strictest basement policy in London — broadly one storey deep, under no more than half the garden, with a construction traffic management plan, which is where a policy-literate drawing pack earns its keep. Its dominant Georgian (1714–1837) and Victorian (1837–1901) housing stock sets the design brief on most streets.
Under Class B, a rear dormer stays permitted development up to 40m³ of added roof volume on a terrace or 50m³ on a semi-detached or detached house, while Class A allows a single-storey rear extension of 3m beyond the original rear wall on a terrace and 4m on a detached house before a full application is needed. Kensington and Chelsea carries at least one Article 4 direction, and conservation areas including Chelsea, Kensington and Holland Park remove those rights outright, so we confirm your exact address before a line is drawn. A validated householder application in Kensington and Chelsea is determined against an 8-week statutory target.
Chelsea (stucco terraces and mews streets off the King's Road), Kensington (grand stucco terraces and mansion blocks), Notting Hill (the Ladbroke Estate's stucco terraces around communal garden squares), Holland Park (large detached villas and substantial mansion flats), Knightsbridge (red-brick mansion blocks and stucco terraces) and Earls Court (tall Victorian terraces widely subdivided into flats) — these are the Kensington and Chelsea pockets our drawings cover most. Heritage designations here include Chelsea, Kensington, Holland Park, Ladbroke and Brompton. the Royal Borough of Kensington and Chelsea weighs each proposal against the RBKC Consolidated Local Plan and the Basements SPD, where with the roofscape closely protected, mansard and roof additions are judged against the prevailing profile of each terrace group. Subdivided period houses are common around Earls Court and Notting Hill, and converted flats hold no householder permitted-development rights.. On roofs the borough is concealed butterfly roofs behind the terrace parapets and mansard roofs added to the stucco terraces, over stucco-fronted Georgian and Victorian terraces, purpose-built mansion blocks and mews houses behind the main streets.
Kensington and Chelsea's roofs set the brief. The borough is built largely from stucco-fronted Georgian and Victorian terraces, purpose-built mansion blocks and mews houses behind the main streets, and its lofts sit under concealed butterfly roofs behind the terrace parapets and mansard roofs added to the stucco terraces — the geometry that decides whether a rear dormer, a hip-to-gable or a mansard gives you the headroom you want. the Royal Borough of Kensington and Chelsea assesses loft proposals against the RBKC Consolidated Local Plan and the Basements SPD, and its case officers read each roof against the pair next door and the wider street before they read the plans.
That makes drawing quality decisive. We measure ridge and eaves heights, roof pitch and the existing stair, calculate the added volume against the permitted-development limits exactly, and show the workings on the drawings so the Royal Borough of Kensington and Chelsea can verify them. The borough runs the strictest basement policy in London — broadly one storey deep, under no more than half the garden, with a construction traffic management plan, so we resolve it on the page rather than leave it for the case officer to raise.
Kensington and Chelsea also carries protected streets — Chelsea, Kensington, Holland Park, Ladbroke and Brompton among them. Almost the entire borough falls within a conservation area, and Article 4 directions strip out permitted-development rights so even minor external changes on the Ladbroke or Chelsea streets need consent. We check your address against those designations before a line is drawn.
Many Kensington and Chelsea loft conversions proceed without planning permission — a rear dormer within the permitted-development volume limits (40 cubic metres on a terrace, 50 on a semi or detached house) is usually lawful. You will normally need a full application to the Royal Borough of Kensington and Chelsea if any of these apply:
We draw the roof line, the ridge height and the neighbour's daylight on the page — the relationships the Royal Borough of Kensington and Chelsea's officers check first — and submit a validation-complete pack, whether that is a lawful development certificate or a full householder application.
Below is the Royal Borough of Kensington and Chelsea's real householder decision record, pulled from official planning statistics and updated as new data lands. The Royal Borough grants a fair share of householder applications but under exacting design control, with borough-wide conservation status and its restrictive basement policy the defining constraints. Professionally prepared loft drawings anticipate those pressure points before submission, which is why complete, policy-literate packs are decided faster and refused less often than DIY applications.
Source: MHCLG planning application statistics (householder decisions, rolling year). Compare every borough on our London approval-rate league table.
Tell us about your project and get a fixed, no-obligation quote back within one working day. If you don't need planning permission at all, we'll tell you that too — for free.
Across Chelsea, Kensington and Notting Hill, the recurring loft is the rear dormer — a box across the back roof slope that turns a cramped attic into a full-height double bedroom and en-suite. On concealed butterfly roofs behind the terrace parapets, that is usually the most efficient use of the roof; where the stock is mansard roofs added to the stucco terraces, a hip-to-gable followed by a rear dormer unlocks far more space, though it needs a full application.
With the roofscape closely protected, mansard and roof additions are judged against the prevailing profile of each terrace group. We draw the dormer inside the volume allowance, keep the flat-roof build-up below the ridge, and set the face back from the eaves as the rules require — so the pack answers the Royal Borough of Kensington and Chelsea's questions before they are asked. Where permitted-development rights are exhausted or removed, we prepare a householder application composed to the borough's roof-alteration guidance instead.
We draw loft conversions on every street in the borough. A few of the neighbourhoods where Kensington and Chelsea roofs come up most often:
Loft conversion drawings for Chelsea's stucco terraces and mews streets off the King's Road — measured, volume-checked and drawn to the Royal Borough of Kensington and Chelsea's guidance.
Loft conversion drawings for Kensington's grand stucco terraces and mansion blocks — measured, volume-checked and drawn to the Royal Borough of Kensington and Chelsea's guidance.
Loft conversion drawings for Notting Hill's the Ladbroke Estate's stucco terraces around communal garden squares — measured, volume-checked and drawn to the Royal Borough of Kensington and Chelsea's guidance.
Loft conversion drawings for Holland Park's large detached villas and substantial mansion flats — measured, volume-checked and drawn to the Royal Borough of Kensington and Chelsea's guidance.
Loft conversion drawings for Knightsbridge's red-brick mansion blocks and stucco terraces — measured, volume-checked and drawn to the Royal Borough of Kensington and Chelsea's guidance.
Loft conversion drawings for Earls Court's tall Victorian terraces widely subdivided into flats — measured, volume-checked and drawn to the Royal Borough of Kensington and Chelsea's guidance.
The right loft in Kensington and Chelsea depends on your roof. This is how the main types compare on planning route and the space they add.
| Loft type | Permitted development? | Space & headroom | What the Royal Borough of Kensington and Chelsea checks |
|---|---|---|---|
| Rear dormer | Usually yes, within volume limits | Full-height double room at the back | Volume, set-back from eaves, ridge height |
| Hip-to-gable | No — full application | Extends the whole side of the roof | Roof bulk and the symmetry of the pair |
| Mansard | No — full application | Maximum floor area across the roof | Street character, especially in conservation areas |
| Rooflights only | Usually yes (Class C) | Light and headroom, no extra footprint | Whether rooflights sit within the existing slope |
Route depends on your street — conservation areas such as Chelsea and Kensington and Article 4 directions can remove permitted-development rights.
A fixed process built around how the Royal Borough of Kensington and Chelsea validates and decides householder loft applications — most drawings are submission-ready within seven days of survey.
Tell us your Kensington and Chelsea postcode and roof type. We confirm your conservation and Article 4 status, how much permitted-development volume you have left, and score your odds against live the Royal Borough of Kensington and Chelsea decisions.
We measure ridge and eaves heights, roof pitch, joist levels and the existing stair — the numbers the volume calculation and head heights depend on.
Chartered designers develop the dormer, hip-to-gable or mansard to your brief, drawn inside the Class B limits or to the Royal Borough of Kensington and Chelsea's roof-alteration guidance.
We submit the certificate or application, manage validation and case-officer queries, and revise the drawings free until the Royal Borough of Kensington and Chelsea issues its decision.
Often not. A rear dormer within 40 cubic metres on a terrace, or 50 on a semi-detached or detached house, set back from the eaves and no higher than the ridge, is usually permitted development. In Kensington and Chelsea the main exceptions are hip-to-gable conversions, dormers visible from the highway, and homes in conservation areas such as Chelsea and Kensington or on streets with an Article 4 direction. the Royal Borough of Kensington and Chelsea is the decision-maker.
Generally no. In conservation areas including Chelsea and Kensington, Class B permitted-development rights for lofts are removed, so a rear dormer that would be lawful elsewhere needs a full application to the Royal Borough of Kensington and Chelsea. Almost the entire borough falls within a conservation area, and Article 4 directions strip out permitted-development rights so even minor external changes on the Ladbroke or Chelsea streets need consent. We check your exact address before drawing.
On concealed butterfly roofs behind the terrace parapets, common across Kensington and Chelsea, a rear dormer is usually the most efficient conversion and often permitted development. Where the roof is mansard roofs added to the stucco terraces, a hip-to-gable followed by a rear dormer gains far more usable space but needs planning permission. Our survey confirms which your roof supports before we draw. the Royal Borough of Kensington and Chelsea is the decision-maker.
A householder planning application in Kensington and Chelsea runs to a statutory eight-week target, and a lawful development certificate to eight weeks as well, though validation can add time if the pack is incomplete. We submit validation-complete drawings and manage case-officer queries to keep the decision on track. the Royal Borough of Kensington and Chelsea is the decision-maker.
If your dormer is permitted development, a lawful development certificate from the Royal Borough of Kensington and Chelsea is council-stamped proof of that — worth having, because every buyer's solicitor will ask for it when you sell. We prepare and submit the certificate application with the same drawing pack.
Every roof is different, so we quote each Kensington and Chelsea project individually — a fixed, no-obligation price back within one working day. The quote covers the full drawing pack with free revisions until the Royal Borough of Kensington and Chelsea approves, and we tell you upfront whether your loft qualifies as permitted development. Call 020 7864 7245 to start.
Answer five quick questions and get a free planning score for your exact address — instantly. Then, if you want the full picture, unlock the detailed analysis: your council's live approval rates, local precedents, constraints on your street and a step-by-step route to permission.
Same fixed quotes, same fast drawings — wherever your project is.