Dormer, hip-to-gable and mansard loft conversion drawings for Tonbridge and Malling homes — prepared to Tonbridge and Malling Borough Council's design guidance, delivered in days and revised free until your decision lands, with a free approval-odds score first.
Tonbridge and Malling Borough Council granted 97% of the householder planning decisions it made in its latest published year — 10 points above the 87% England-wide householder average. Tonbridge and Malling contains Addington, Budd's Green, Shipbourne, Butts Hill, Wrotham conservation areas (Addington designated 1971), so materials, fenestration and roof form are assessed against the appraisal, which is where a policy-literate drawing pack earns its keep. Its dominant Victorian (1837–1901) and postwar (1945–1970) housing stock sets the design brief on most streets.
Before permission is required, Class B allows 40m³ of added loft volume on a terrace and 50m³ on a semi or detached house, and Class A allows a 3m single-storey rear extension on a terrace or 4m on a detached house. In conservation areas such as Addington, Budd's Green, Shipbourne and Butts Hill, Wrotham those rights are removed, so we confirm your exact address before a line is drawn. A validated householder application in Tonbridge and Malling is determined against an 8-week statutory target.
Addington (conservation area designated in 1971), Budd's Green, Shipbourne (conservation area designated in 1993), Butts Hill, Wrotham (conservation area designated in 1993), Claygate Cross, Plaxtol (conservation area designated in 1993), Coldharbour, Hildenborough (conservation area designated in 1993), Fairlawne (conservation area designated in 1972), Fairseat (conservation area designated in 1972), Hadlow (conservation area designated in 1972), Borough Green & Platt (ward of Tonbridge and Malling), Bourne (ward of Tonbridge and Malling), Hildenborough (ward of Tonbridge and Malling), Judd (ward of Tonbridge and Malling), Larkfield (ward of Tonbridge and Malling) and Pilgrims with Ightham (ward of Tonbridge and Malling) — these are the Tonbridge and Malling pockets our drawings cover most. Heritage designations here include Addington, Budd's Green, Shipbourne, Butts Hill, Wrotham, Claygate Cross, Plaxtol, Coldharbour, Hildenborough, Fairlawne, Fairseat and Hadlow. Tonbridge and Malling Borough Council weighs each proposal against Tonbridge and Malling Borough Council's adopted local plan and its householder design guidance, where the 16,010 homes here are 18% pre-1900, 14% 1955-1964, 6% 1965-1972, which is what sets the realistic roof and rear-projection options. On roofs the borough is steeply pitched slate roofs, valley gutters and party parapets typical of pre-1900 building and shallow gabled roofs typical of that period's building, over Victorian and earlier houses (18% of 16,010 homes), late-1950s and early-1960s houses (14%) and late-1960s and early-1970s houses (6%).
What is permitted in Tonbridge and Malling turns on designation first, so that is where we start: Addington (conservation area designated in 1971), Budd's Green, Shipbourne (conservation area designated in 1993), Butts Hill, Wrotham (conservation area designated in 1993), Claygate Cross, Plaxtol (conservation area designated in 1993), Coldharbour, Hildenborough (conservation area designated in 1993), Fairlawne (conservation area designated in 1972), Fairseat (conservation area designated in 1972) and Hadlow (conservation area designated in 1972). Inside those boundaries permitted development is curtailed and Tonbridge and Malling Borough Council assesses materials, window detail and roof form against the area's own appraisal, so a scheme that would be waved through two streets away can need a full application here.
Beyond the designated areas, Tonbridge and Malling takes in Borough Green & Platt, Bourne, Hildenborough, Judd, Larkfield and Pilgrims with Ightham. No Article 4 direction is recorded for Tonbridge and Malling Borough Council, but the district's 8 conservation areas still limit permitted development on those streets.
On stock, Tonbridge and Malling is Victorian and earlier houses (18% of 16,010 homes), late-1950s and early-1960s houses (14%) and late-1960s and early-1970s houses (6%) — which is why steeply pitched slate roofs, valley gutters and party parapets typical of pre-1900 building and shallow gabled roofs typical of that period's building govern what a loft or rear projection can realistically be. Tonbridge and Malling Borough Council decided 515 householder applications in the latest published year and granted 97%, with 49% issued inside the eight-week target. We draw to that record rather than to a national average.
The full build-period split for Tonbridge and Malling runs pre-1900 3% (190 homes), 1900-1918 0% (30 homes), 1919-1929 0% (10 homes), 1930-1939 6% (350 homes), 1945-1954 3% (170 homes), 1955-1964 30% (1,850 homes), 1965-1972 33% (1,990 homes), 1973-1982 4% (260 homes), 1983-1992 5% (310 homes), 1993-1999 4% (220 homes) and 2000-2008 3% (170 homes). That distribution is why pre-1900 detailing dominates the drawings here, and it is measured from council-tax records rather than assumed from the street name.
Tonbridge and Malling Borough Council also decides for Borough Green & Platt, Bourne, Hildenborough, Judd, Larkfield and Pilgrims with Ightham, so a decision in Tonbridge and Malling sits inside a wider pattern of decisions we track across the same authority — useful when an officer cites a precedent from the next area over.
Published figures for Tonbridge and Malling and Tonbridge and Malling Borough Council. These are the numbers that decide what is realistic on your street, so we work from them rather than from national averages.
| Measure | Tonbridge and Malling |
|---|---|
| Dwellings recorded | 16,010 |
| Built pre-1900 | 190 (3%) |
| Built 1900-1918 | 30 (0%) |
| Built 1919-1929 | 10 (0%) |
| Built 1930-1939 | 350 (6%) |
| Built 1945-1954 | 170 (3%) |
| Built 1955-1964 | 1,850 (30%) |
| Built 1965-1972 | 1,990 (33%) |
| Built 1973-1982 | 260 (4%) |
| Built 1983-1992 | 310 (5%) |
| Built 1993-1999 | 220 (4%) |
| Built 2000-2008 | 170 (3%) |
| Built before 1919 | 23% |
| Built 1919–1939 | 10% |
| Built 1945–2008 | 58% |
| Conservation areas in Tonbridge and Malling | 8 (Addington, Budd's Green, Shipbourne…) |
| Conservation areas district-wide | 60 |
| Article 4 directions recorded | 0 |
| Householder applications decided | 515 |
| Householder applications granted | 97% |
| Decided within 8 weeks | 49% |
Dwelling stock from VOA council-tax data at 31 March 2025; conservation-area and Article 4 counts from planning.data.gov.uk (MHCLG); decision figures are Tonbridge and Malling Borough Council's own, from MHCLG live table PS2 for the year to 31 March 2026.
Tonbridge and Malling's roofs set the brief. The borough is built largely from Victorian and earlier houses (18% of 16,010 homes), late-1950s and early-1960s houses (14%) and late-1960s and early-1970s houses (6%), and its lofts sit under steeply pitched slate roofs, valley gutters and party parapets typical of pre-1900 building and shallow gabled roofs typical of that period's building — the geometry that decides whether a rear dormer, a hip-to-gable or a mansard gives you the headroom you want. Tonbridge and Malling Borough Council assesses loft proposals against Tonbridge and Malling Borough Council's adopted local plan and its householder design guidance, 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 Tonbridge and Malling Borough Council can verify them. Tonbridge and Malling contains Addington, Budd's Green, Shipbourne, Butts Hill, Wrotham conservation areas (Addington designated 1971), so materials, fenestration and roof form are assessed against the appraisal, so we resolve it on the page rather than leave it for the case officer to raise.
Tonbridge and Malling also carries protected streets — Addington, Budd's Green, Shipbourne, Butts Hill, Wrotham, Claygate Cross, Plaxtol, Coldharbour, Hildenborough, Fairlawne, Fairseat and Hadlow among them. No Article 4 direction is recorded for Tonbridge and Malling Borough Council, but the district's 8 conservation areas still limit permitted development on those streets. We check your address against those designations before a line is drawn.
Many Tonbridge and Malling 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 Tonbridge and Malling Borough Council if any of these apply:
We draw the roof line, the ridge height and the neighbour's daylight on the page — the relationships Tonbridge and Malling Borough 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 Tonbridge and Malling Borough Council's real householder decision record, pulled from official planning statistics and updated as new data lands. Tonbridge and Malling Borough Council granted 97% of 515 householder decisions in the year to 31 March 2026, 49% of them inside eight weeks. 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, England, 1 April 2025 - 31 March 2026). 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 Addington, Budd's Green, Shipbourne and Butts Hill, Wrotham, 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 steeply pitched slate roofs, valley gutters and party parapets typical of pre-1900 building, that is usually the most efficient use of the roof; where the stock is shallow gabled roofs typical of that period's building, a hip-to-gable followed by a rear dormer unlocks far more space, though it needs a full application.
The 16,010 homes here are 18% pre-1900, 14% 1955-1964, 6% 1965-1972, which is what sets the realistic roof and rear-projection options. 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 Tonbridge and Malling Borough 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 Tonbridge and Malling roofs come up most often:
Loft conversion drawings for Addington's conservation area designated in 1971 — measured, volume-checked and drawn to Tonbridge and Malling Borough Council's guidance.
Loft conversion drawings for Budd's Green, Shipbourne's conservation area designated in 1993 — measured, volume-checked and drawn to Tonbridge and Malling Borough Council's guidance.
Loft conversion drawings for Butts Hill, Wrotham's conservation area designated in 1993 — measured, volume-checked and drawn to Tonbridge and Malling Borough Council's guidance.
Loft conversion drawings for Claygate Cross, Plaxtol's conservation area designated in 1993 — measured, volume-checked and drawn to Tonbridge and Malling Borough Council's guidance.
Loft conversion drawings for Coldharbour, Hildenborough's conservation area designated in 1993 — measured, volume-checked and drawn to Tonbridge and Malling Borough Council's guidance.
Loft conversion drawings for Fairlawne's conservation area designated in 1972 — measured, volume-checked and drawn to Tonbridge and Malling Borough Council's guidance.
The right loft in Tonbridge and Malling 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 Tonbridge and Malling Borough 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 Addington and Budd's Green, Shipbourne and Article 4 directions can remove permitted-development rights.
A fixed process built around how Tonbridge and Malling Borough Council validates and decides householder loft applications — most drawings are submission-ready within seven days of survey.
Tell us your Tonbridge and Malling 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 Tonbridge and Malling Borough 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 Tonbridge and Malling Borough Council's roof-alteration guidance.
We submit the certificate or application, manage validation and case-officer queries, and revise the drawings free until Tonbridge and Malling Borough 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 Tonbridge and Malling the main exceptions are hip-to-gable conversions, dormers visible from the highway, and homes in conservation areas such as Addington and Budd's Green, Shipbourne or on streets with an Article 4 direction. Tonbridge and Malling Borough Council is the decision-maker.
Generally no. In conservation areas including Addington and Budd's Green, Shipbourne, Class B permitted-development rights for lofts are removed, so a rear dormer that would be lawful elsewhere needs a full application to Tonbridge and Malling Borough Council. No Article 4 direction is recorded for Tonbridge and Malling Borough Council, but the district's 8 conservation areas still limit permitted development on those streets. We check your exact address before drawing.
On steeply pitched slate roofs, valley gutters and party parapets typical of pre-1900 building, common across Tonbridge and Malling, a rear dormer is usually the most efficient conversion and often permitted development. Where the roof is shallow gabled roofs typical of that period's building, 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. Tonbridge and Malling Borough Council is the decision-maker.
A householder planning application in Tonbridge and Malling 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. Tonbridge and Malling Borough Council is the decision-maker.
If your dormer is permitted development, a lawful development certificate from Tonbridge and Malling Borough 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 Tonbridge and Malling project individually — a fixed, no-obligation price back within one working day. The quote covers the full drawing pack with free revisions until Tonbridge and Malling Borough 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.