Mansard drawings for Camden terraces — the rebuilt roof with a steep, near-vertical rear slope that adds a full storey of loft, drawn to Camden Council's roofline and streetscape rules, delivered in days and revised free until your decision, with a free approval-odds check first.
Camden Council granted 88% of the householder planning decisions it made in its latest published year — 1 point above the 87% England-wide householder average. The council runs one of London's strictest basement regimes, capping depth and demanding a Basement Impact Assessment, 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.
Class A and Class B set the thresholds — a rear dormer to 40m³ on a terrace or 50m³ on a semi or detached, and a single-storey rear extension to 3m on a terrace or 4m on a detached house — beyond which Camden Council needs a full application. Camden carries at least one Article 4 direction, and conservation areas including Hampstead, Fitzroy Square and Bloomsbury remove those rights outright, so we confirm your exact address before a line is drawn. A validated householder application in Camden is determined against an 8-week statutory target.
Hampstead (Georgian and Victorian houses inside a tightly protected conservation area), Belsize Park (grand Victorian villas and red-brick mansion blocks), Camden Town (dense Victorian terraces around the market), Primrose Hill (pastel-painted Victorian terraces beside Regent's Park), Kentish Town (Victorian terraces and converted flats) and Bloomsbury (Georgian squares and formal terraces) — these are the Camden pockets our drawings cover most. Heritage designations here include Hampstead, Fitzroy Square, Bloomsbury, Camden Town and Primrose Hill. Camden Council weighs each proposal against Camden Local Plan and the Camden Planning Guidance (CPG) on home improvements, where mansard and roof additions in conservation areas are measured against the terrace's original roofline and rhythm. Purpose-built mansion flats and converted terraces are widespread, and flats and maisonettes carry no householder permitted-development rights.. On roofs the borough is London butterfly / valley roofs behind parapets and mansard roofs on the taller terraces, over Georgian and Victorian terraces, purpose-built mansion flats and converted period flats.
The mansard is the maximum-volume loft, and Camden's stock is where it belongs — the borough runs to Georgian and Victorian terraces, purpose-built mansion flats and converted period flats, and on a period terrace a mansard rebuilds the roof at roughly seventy degrees to create almost a full new floor rather than the part-height room a dormer returns. Camden Council assesses it against Camden Local Plan and the Camden Planning Guidance (CPG) on home improvements, and because the whole roof changes shape the test is the street: whether the new profile continues the terrace or breaks it.
That is what the drawings have to settle. We set the mansard behind the original parapet or eaves, hold it to the ridge height of neighbouring mansards where the terrace already has them, and detail the slate face, the dormer windows within it and the party walls to both sides so the addition reads as part of the row. The council runs one of London's strictest basement regimes, capping depth and demanding a Basement Impact Assessment, and on a roof this prominent that is the argument that has to be won on the page.
Much of Camden's terraced stock is designated — Hampstead, Fitzroy Square, Bloomsbury, Camden Town and Primrose Hill among the areas — and there a mansard is judged on whether it restores or respects the historic roofline. Much of Camden — the Hampstead and Fitzroy Square conservation areas among them — sits under Article 4 directions that strip out permitted-development rights, and the borough's basement rules pile on a further layer of control. Some terraces already have a consistent mansard line an addition can follow; others do not, and we establish which before drawing.
A mansard in Camden always needs a full application to Camden Council — rebuilding the roof puts it well outside permitted development. These are the points the council weighs:
We draw the new roof behind the parapet, the slope and ridge matched to the terrace, the slate face and dormer windows, and the party walls to both neighbours — the roofline and streetscape relationships Camden Council's officers check first — and submit a validation-complete householder application.
Below is Camden Council's real householder decision record, drawn from official planning statistics and refreshed as new data lands. Camden approves the large majority of householder applications, though its basement policy and dense conservation coverage are the decisive constraints on many schemes. A mansard is decided on roofline and streetscape, so a scheme drawn to continue the terrace is cleared faster and refused less often than one that fights it.
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 Hampstead, Belsize Park and Camden Town, the mansard that goes through is the one that disappears into the row: set behind the parapet, its ridge matched to neighbouring mansards, the front slope in natural slate with traditional dormer windows, and the whole storey reading as though the terrace was always that height. On the borough's georgian and victorian terraces, this is the single biggest volume the roof can give — close to a full floor.
Mansard and roof additions in conservation areas are measured against the terrace's original roofline and rhythm. We follow any established mansard line on the terrace, keep the slope and materials traditional, and where a row has none yet, draw a design that could set the pattern rather than break it — the argument Camden Council needs to grant on a roof this visible.
We draw mansard roofs on the period-terrace streets across the borough. A few of the neighbourhoods where Camden mansards come up most often:
Mansard loft drawings for Hampstead's Georgian and Victorian houses inside a tightly protected conservation area — roofline-matched, slate-detailed and drawn to Camden Council's guidance.
Mansard loft drawings for Belsize Park's grand Victorian villas and red-brick mansion blocks — roofline-matched, slate-detailed and drawn to Camden Council's guidance.
Mansard loft drawings for Camden Town's dense Victorian terraces around the market — roofline-matched, slate-detailed and drawn to Camden Council's guidance.
Mansard loft drawings for Primrose Hill's pastel-painted Victorian terraces beside Regent's Park — roofline-matched, slate-detailed and drawn to Camden Council's guidance.
Mansard loft drawings for Kentish Town's Victorian terraces and converted flats — roofline-matched, slate-detailed and drawn to Camden Council's guidance.
Mansard loft drawings for Bloomsbury's Georgian squares and formal terraces — roofline-matched, slate-detailed and drawn to Camden Council's guidance.
A mansard wins the most space of any loft but asks the most of the planning case. This is how it compares in Camden.
| Loft type | Planning route | Space gained | What Camden Council checks |
|---|---|---|---|
| Mansard | Always a full application | Close to a full extra storey | Roofline, streetscape, terrace match |
| Rear dormer | Often permitted development | A room across the back slope | Volume and eaves set-back |
| Hip-to-gable | Full application | Full width where the roof is hipped | Balance with the paired neighbour |
| Rooflights only | Usually permitted development | Light and headroom, no new shape | Rooflights within the existing slope |
In conservation areas such as Hampstead and Fitzroy Square, a mansard is judged on how it sits within the protected roofline of the terrace.
A fixed process built around how Camden Council validates and decides mansard applications — most drawings are submission-ready within seven days of survey.
Send us your Camden postcode and terrace type. We confirm your conservation and Article 4 status, check whether the row already has a mansard line to follow, and score your odds against live Camden Council decisions.
We measure the parapet, ridge and party walls, and the roofline of the neighbouring houses — the numbers the new slope, its height and the terrace match depend on.
Chartered designers develop the rebuilt roof to your brief, drawn to Camden Council's roof-alteration and conservation guidance with the slope, slate face, dormers and party walls detailed on the page.
We submit the householder application, manage validation and case-officer queries, and revise the drawings free until Camden Council issues its decision.
Always. A mansard rebuilds the roof into a steep rear slope with a flat top, and that wholesale change of roof shape is well outside permitted development — so it needs a full householder application to Camden Council on every street, designated or not. On a terrace in a conservation area such as Hampstead and Fitzroy Square the roofline is protected, so the design is scrutinised more closely still.
It is a rebuilt roof with a steep, near-vertical rear slope and a small flat top, which creates almost a full extra storey inside — far more than a dormer returns. Camden's period terraces are the classic mansard candidates, and where a row already carries mansards a new one that matches the line is the most likely of all lofts to be approved despite being the largest. Camden Council is the decision-maker.
Because it reshapes the whole roof rather than adding a box to it. The steep slope pushes the walls out almost to vertical and the flat top lifts the ceiling, so the usable floor runs nearly the full footprint of the house at head height — close to a complete storey. That is why, in Camden, a mansard is chosen when a dormer or hip-to-gable will not give enough room. Camden Council is the decision-maker.
It can, but the case is harder. Where a terrace already has a consistent mansard line, matching it is straightforward; on an unbroken row, Camden Council weighs whether your mansard would break the skyline or could set an acceptable pattern for the street. We draw the design to sit within the terrace and make that argument on the elevations rather than leave it to chance.
Almost certainly, on both sides. A mansard rebuilds the roof up to and across the party walls with the neighbours either side, so the Party Wall etc. Act applies to each and notice must be served before work starts — separately from Camden Council's planning decision. We detail both party walls on the drawings and flag the notices early so surveyors can be appointed without holding up the build.
We price each Camden mansard individually, because the terrace, the roofline match and the party-wall detailing vary street to street, and send a fixed, no-obligation quote within one working day. It covers the full drawing pack with free revisions until Camden Council approves, and we confirm the roofline case at the outset. 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.