Dormer, hip-to-gable and mansard loft conversion drawings for Kennington homes — prepared to Ashford Borough Council's design guidance, delivered in days and revised free until your decision lands, with a free approval-odds score first.
Ashford Borough Council granted 92% of the householder planning decisions it made in its latest published year — 5 points above the 87% England-wide householder average. Kennington contains Kennington & Ball Lane, Kennington & Ball Lane Part conservation areas (Kennington & Ball Lane designated 1996), 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. Kennington carries at least one Article 4 direction, and conservation areas including Kennington & Ball Lane and Kennington & Ball Lane Part remove those rights outright, so we confirm your exact address before a line is drawn. A validated householder application in Kennington is determined against an 8-week statutory target.
Kennington & Ball Lane (conservation area designated in 1996) and Kennington & Ball Lane Part (conservation area designated in 1996) — these are the Kennington pockets our drawings cover most. Heritage designations here include Kennington & Ball Lane and Kennington & Ball Lane Part. Ashford Borough Council weighs each proposal against Ashford Borough Council's development plan and the design policies it applies to householder applications, where the 990 homes here are 20% 1955-1964, 20% 1965-1972, 17% pre-1900, which is what sets the realistic roof and rear-projection options. On roofs the borough is shallow gabled roofs typical of that period's building and shallow-pitched roofs and integral garages typical of that period's building, over late-1950s and early-1960s houses (20% of 990 homes), late-1960s and early-1970s houses (20%) and Victorian and earlier houses (17%).
What is permitted in Kennington turns on designation first, so that is where we start: Kennington & Ball Lane (conservation area designated in 1996) and Kennington & Ball Lane Part (conservation area designated in 1996). Inside those boundaries permitted development is curtailed and Ashford 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.
Ashford Borough Council has 73 recorded Article 4 directions — check the address before assuming PD applies in Kennington.
On stock, Kennington is late-1950s and early-1960s houses (20% of 990 homes), late-1960s and early-1970s houses (20%) and Victorian and earlier houses (17%) — which is why shallow gabled roofs typical of that period's building and shallow-pitched roofs and integral garages typical of that period's building govern what a loft or rear projection can realistically be. Ashford Borough Council decided 453 householder applications in the latest published year and granted 92%, with 75% issued inside the eight-week target. We draw to that record rather than to a national average.
The full build-period split for Kennington runs pre-1900 17% (170 homes), 1900-1918 5% (50 homes), 1919-1929 3% (30 homes), 1930-1939 4% (40 homes), 1945-1954 3% (30 homes), 1955-1964 20% (200 homes), 1965-1972 20% (200 homes), 1973-1982 2% (20 homes), 1983-1992 9% (90 homes), 1993-1999 7% (70 homes) and 2000-2008 2% (20 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.
Ashford Borough Council also decides for Bircholt, Downs North, Isle of Oxney, Saxon Shore, Tenterden South, Tenterden St Michael's, Upper Weald and Weald Central, so a decision in Kennington 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.
The Article 4 directions recorded for this council include 1 - Caravan, 2 3 - agriculture, 4 - forestry, 1 - Gate, fence, wall, 2 - Use of land, 1 - Use of land, 2 3 - Agricultural, 4 - Forestry and 1 - gate, fence, 2 - use of land. Each removes a specific permitted-development right inside its own boundary, which is why the check is done on the address rather than on the town.
Published figures for Kennington and Ashford 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 | Kennington |
|---|---|
| Dwellings recorded | 990 |
| Built pre-1900 | 170 (17%) |
| Built 1900-1918 | 50 (5%) |
| Built 1919-1929 | 30 (3%) |
| Built 1930-1939 | 40 (4%) |
| Built 1945-1954 | 30 (3%) |
| Built 1955-1964 | 200 (20%) |
| Built 1965-1972 | 200 (20%) |
| Built 1973-1982 | 20 (2%) |
| Built 1983-1992 | 90 (9%) |
| Built 1993-1999 | 70 (7%) |
| Built 2000-2008 | 20 (2%) |
| Built before 1919 | 22% |
| Built 1919–1939 | 7% |
| Built 1945–2008 | 64% |
| Conservation areas in Kennington | 2 (Kennington & Ball Lane, Kennington & Ball Lane Part) |
| Conservation areas district-wide | 44 |
| Article 4 directions recorded | 73 |
| Householder applications decided | 453 |
| Householder applications granted | 92% |
| Decided within 8 weeks | 75% |
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 Ashford Borough Council's own, from MHCLG live table PS2 for the year to 31 March 2026.
Kennington's roofs set the brief. The borough is built largely from late-1950s and early-1960s houses (20% of 990 homes), late-1960s and early-1970s houses (20%) and Victorian and earlier houses (17%), and its lofts sit under shallow gabled roofs typical of that period's building and shallow-pitched roofs and integral garages 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. Ashford Borough Council assesses loft proposals against Ashford Borough Council's development plan and the design policies it applies to householder applications, 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 Ashford Borough Council can verify them. Kennington contains Kennington & Ball Lane, Kennington & Ball Lane Part conservation areas (Kennington & Ball Lane designated 1996), 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.
Kennington also carries protected streets — Kennington & Ball Lane and Kennington & Ball Lane Part among them. Ashford Borough Council has 73 recorded Article 4 directions — check the address before assuming PD applies in Kennington. We check your address against those designations before a line is drawn.
Many Kennington 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 Ashford 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 Ashford 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 Ashford Borough Council's real householder decision record, pulled from official planning statistics and updated as new data lands. Ashford Borough Council granted 92% of its householder applications in the year to 31 March 2026, and Kennington & Ball Lane shapes what is approved here. 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 Kennington & Ball Lane and Kennington & Ball Lane Part, 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 shallow gabled roofs typical of that period's building, that is usually the most efficient use of the roof; where the stock is shallow-pitched roofs and integral garages 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 990 homes here are 20% 1955-1964, 20% 1965-1972, 17% pre-1900, 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 Ashford 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 Kennington roofs come up most often:
Loft conversion drawings for Kennington & Ball Lane's conservation area designated in 1996 — measured, volume-checked and drawn to Ashford Borough Council's guidance.
Loft conversion drawings for Kennington & Ball Lane Part's conservation area designated in 1996 — measured, volume-checked and drawn to Ashford Borough Council's guidance.
The right loft in Kennington 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 Ashford 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 Kennington & Ball Lane and Kennington & Ball Lane Part and Article 4 directions can remove permitted-development rights.
A fixed process built around how Ashford Borough Council validates and decides householder loft applications — most drawings are submission-ready within seven days of survey.
Tell us your Kennington 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 Ashford 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 Ashford Borough Council's roof-alteration guidance.
We submit the certificate or application, manage validation and case-officer queries, and revise the drawings free until Ashford 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 Kennington the main exceptions are hip-to-gable conversions, dormers visible from the highway, and homes in conservation areas such as Kennington & Ball Lane and Kennington & Ball Lane Part or on streets with an Article 4 direction. Ashford Borough Council is the decision-maker.
Generally no. In conservation areas including Kennington & Ball Lane and Kennington & Ball Lane Part, Class B permitted-development rights for lofts are removed, so a rear dormer that would be lawful elsewhere needs a full application to Ashford Borough Council. Ashford Borough Council has 73 recorded Article 4 directions — check the address before assuming PD applies in Kennington. We check your exact address before drawing.
On shallow gabled roofs typical of that period's building, common across Kennington, a rear dormer is usually the most efficient conversion and often permitted development. Where the roof is shallow-pitched roofs and integral garages 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. Ashford Borough Council is the decision-maker.
A householder planning application in Kennington 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. Ashford Borough Council is the decision-maker.
If your dormer is permitted development, a lawful development certificate from Ashford 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. This applies to your Kennington address specifically.
Every roof is different, so we quote each Kennington project individually — a fixed, no-obligation price back within one working day. The quote covers the full drawing pack with free revisions until Ashford Borough Council approves, and we tell you upfront whether your loft qualifies as permitted development. Call 020 7864 7245 to start.
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