Dormer, hip-to-gable and mansard loft conversion drawings for Barnet homes — prepared to Barnet Council's design guidance, delivered in days and revised free until your decision lands, with a free approval-odds score first.
Barnet Council granted 86% of the householder planning decisions it made in its latest published year — 1 point below the 87% England-wide householder average. Hampstead Garden Suburb schemes are assessed against the Suburb's own design code as well as council policy, which is where a policy-literate drawing pack earns its keep. Its dominant Edwardian (1901–1910), interwar (1918–1939) and postwar (1945–1970) 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 Barnet Council needs a full application. Barnet carries at least one Article 4 direction, and conservation areas including Hampstead Garden Suburb, Mill Hill and Monken Hadley remove those rights outright, so we confirm your exact address before a line is drawn. A validated householder application in Barnet is determined against an 8-week statutory target.
Finchley (1930s semis around Church End), Golders Green (Edwardian and interwar houses near Hampstead Garden Suburb), Hendon (interwar semi-detached estates), Mill Hill (detached houses and the Mill Hill conservation area), Edgware (Metroland semis with hipped roofs) and Totteridge (large plots within the Green Belt and conservation area) — these are the Barnet pockets our drawings cover most. Heritage designations here include Hampstead Garden Suburb, Mill Hill, Monken Hadley, Totteridge and Finchley (Church End). Barnet Council weighs each proposal against Barnet Local Plan and the Residential Design Guidance SPD, where roof form and the symmetry of paired 1930s houses are decisive for lofts. On roofs the borough is hipped roofs on the Metroland semis and steep tiled roofs in the Garden Suburb, over 1930s semi-detached houses, Hampstead Garden Suburb cottages and houses and postwar and detached homes.
Barnet's roofs set the brief. The borough is built largely from 1930s semi-detached houses, Hampstead Garden Suburb cottages and houses and postwar and detached homes, and its lofts sit under hipped roofs on the Metroland semis and steep tiled roofs in the Garden Suburb — the geometry that decides whether a rear dormer, a hip-to-gable or a mansard gives you the headroom you want. Barnet Council assesses loft proposals against Barnet Local Plan and the Residential Design Guidance 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 Barnet Council can verify them. Hampstead Garden Suburb schemes are assessed against the Suburb's own design code as well as council policy, so we resolve it on the page rather than leave it for the case officer to raise.
Barnet also carries protected streets — Hampstead Garden Suburb, Mill Hill, Monken Hadley, Totteridge and Finchley (Church End) among them. Hampstead Garden Suburb is one of London's most tightly controlled conservation areas, with an Article 4 direction and its own Trust scheme of management — most external changes there need consent. We check your address against those designations before a line is drawn.
Many Barnet 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 Barnet Council if any of these apply:
We draw the roof line, the ridge height and the neighbour's daylight on the page — the relationships Barnet Council's officers check first — and submit a validation-complete pack, whether that is a lawful development certificate or a full householder application.
Below is Barnet Council's real householder decision record, pulled from official planning statistics and updated as new data lands. Barnet grants a strong share of householder applications, but its Garden Suburb and Metroland conservation areas apply detailed roof- and frontage-design controls that shape loft and extension schemes. 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 Finchley, Golders Green and Hendon, 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 hipped roofs on the Metroland semis, that is usually the most efficient use of the roof; where the stock is steep tiled roofs in the Garden Suburb, a hip-to-gable followed by a rear dormer unlocks far more space, though it needs a full application.
Roof form and the symmetry of paired 1930s houses are decisive for lofts. 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 Barnet Council'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 Barnet roofs come up most often:
Loft conversion drawings for Finchley's 1930s semis around Church End — measured, volume-checked and drawn to Barnet Council's guidance.
Loft conversion drawings for Golders Green's Edwardian and interwar houses near Hampstead Garden Suburb — measured, volume-checked and drawn to Barnet Council's guidance.
Loft conversion drawings for Hendon's interwar semi-detached estates — measured, volume-checked and drawn to Barnet Council's guidance.
Loft conversion drawings for Mill Hill's detached houses and the Mill Hill conservation area — measured, volume-checked and drawn to Barnet Council's guidance.
Loft conversion drawings for Edgware's Metroland semis with hipped roofs — measured, volume-checked and drawn to Barnet Council's guidance.
Loft conversion drawings for Totteridge's large plots within the Green Belt and conservation area — measured, volume-checked and drawn to Barnet Council's guidance.
The right loft in Barnet 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 Barnet Council 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 Hampstead Garden Suburb and Mill Hill and Article 4 directions can remove permitted-development rights.
A fixed process built around how Barnet Council validates and decides householder loft applications — most drawings are submission-ready within seven days of survey.
Tell us your Barnet 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 Barnet Council 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 Barnet Council's roof-alteration guidance.
We submit the certificate or application, manage validation and case-officer queries, and revise the drawings free until Barnet Council 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 Barnet the main exceptions are hip-to-gable conversions, dormers visible from the highway, and homes in conservation areas such as Hampstead Garden Suburb and Mill Hill or on streets with an Article 4 direction. Barnet Council is the decision-maker.
Generally no. In conservation areas including Hampstead Garden Suburb and Mill Hill, Class B permitted-development rights for lofts are removed, so a rear dormer that would be lawful elsewhere needs a full application to Barnet Council. Hampstead Garden Suburb is one of London's most tightly controlled conservation areas, with an Article 4 direction and its own Trust scheme of management — most external changes there need consent. We check your exact address before drawing.
On hipped roofs on the Metroland semis, common across Barnet, a rear dormer is usually the most efficient conversion and often permitted development. Where the roof is steep tiled roofs in the Garden Suburb, 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. Barnet Council is the decision-maker.
A householder planning application in Barnet 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. Barnet Council is the decision-maker.
If your dormer is permitted development, a lawful development certificate from Barnet Council 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 Barnet project individually — a fixed, no-obligation price back within one working day. The quote covers the full drawing pack with free revisions until Barnet Council 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.