Dormer, hip-to-gable and mansard loft conversion drawings for Eynsham and Cassington homes — prepared to West Oxfordshire District Council's design guidance, delivered in days and revised free until your decision lands, with a free approval-odds score first.
West Oxfordshire District Council granted 97% of the householder planning decisions it made in its latest published year — 10 points above the 87% England-wide householder average. Eynsham and Cassington contains Cassington Conservation Area, Eynsham Conservation Area conservation areas (Cassington Conservation Area designated 1992), 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. Eynsham and Cassington carries at least one Article 4 direction, and conservation areas including Cassington Conservation Area and Eynsham Conservation Area remove those rights outright, so we confirm your exact address before a line is drawn. A validated householder application in Eynsham and Cassington is determined against an 8-week statutory target.
Cassington (conservation area designated in 1992), Eynsham (conservation area designated in 1975), South Leigh and High Cogges (civil parish within Eynsham and Cassington), Cassington (civil parish within Eynsham and Cassington) and Eynsham (civil parish within Eynsham and Cassington) — these are the Eynsham and Cassington pockets our drawings cover most. Heritage designations here include Cassington Conservation Area and Eynsham Conservation Area. West Oxfordshire District Council weighs each proposal against West Oxfordshire District Council's development plan and the design policies it applies to householder applications, where the 3,040 homes here are 18% 1965-1972, 15% pre-1900, 15% 1955-1964, which is what sets the realistic roof and rear-projection options. On roofs the borough is shallow-pitched roofs and integral garages typical of that period's building and steeply pitched slate roofs, valley gutters and party parapets typical of pre-1900 building, over late-1960s and early-1970s houses (18% of 3,040 homes), Victorian and earlier houses (15%) and late-1950s and early-1960s houses (15%).
What is permitted in Eynsham and Cassington turns on designation first, so that is where we start: Cassington (conservation area designated in 1992) and Eynsham (conservation area designated in 1975). Inside those boundaries permitted development is curtailed and West Oxfordshire District 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, Eynsham and Cassington takes in South Leigh and High Cogges, Cassington and Eynsham. West Oxfordshire District Council has 84 recorded Article 4 directions, removing permitted development for painting the exterior and gates, walls and fences — check the address before assuming PD applies in Eynsham and Cassington.
On stock, Eynsham and Cassington is late-1960s and early-1970s houses (18% of 3,040 homes), Victorian and earlier houses (15%) and late-1950s and early-1960s houses (15%) — which is why shallow-pitched roofs and integral garages typical of that period's building and steeply pitched slate roofs, valley gutters and party parapets typical of pre-1900 building govern what a loft or rear projection can realistically be. West Oxfordshire District Council decided 616 householder applications in the latest published year and granted 97%, 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 Eynsham and Cassington runs pre-1900 15% (470 homes), 1900-1918 1% (20 homes), 1919-1929 3% (100 homes), 1930-1939 3% (100 homes), 1945-1954 4% (130 homes), 1955-1964 15% (470 homes), 1965-1972 18% (560 homes), 1973-1982 5% (160 homes), 1983-1992 10% (300 homes), 1993-1999 4% (110 homes) and 2000-2008 3% (80 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.
West Oxfordshire District Council also decides for Alvescot and Filkins, Ascott and Shipton, Bampton and Clanfield, Ducklington, Milton-under-Wychwood, The Bartons, Witney Central and Woodstock and Bladon, so a decision in Eynsham and Cassington 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 Article 4 ((Little Rollright), Article 4 (Cassington), Article 4 (Charlbury 1) and Article 4 (Crawley 1). 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 Eynsham and Cassington and West Oxfordshire District Council. These are the numbers that decide what is realistic on your street, so we work from them rather than from national averages.
| Measure | Eynsham and Cassington |
|---|---|
| Dwellings recorded | 3,040 |
| Built pre-1900 | 470 (15%) |
| Built 1900-1918 | 20 (1%) |
| Built 1919-1929 | 100 (3%) |
| Built 1930-1939 | 100 (3%) |
| Built 1945-1954 | 130 (4%) |
| Built 1955-1964 | 470 (15%) |
| Built 1965-1972 | 560 (18%) |
| Built 1973-1982 | 160 (5%) |
| Built 1983-1992 | 300 (10%) |
| Built 1993-1999 | 110 (4%) |
| Built 2000-2008 | 80 (3%) |
| Built before 1919 | 16% |
| Built 1919–1939 | 7% |
| Built 1945–2008 | 60% |
| Conservation areas in Eynsham and Cassington | 2 (Cassington Conservation Area, Eynsham Conservation Area) |
| Conservation areas district-wide | 50 |
| Article 4 directions recorded | 84 |
| Householder applications decided | 616 |
| Householder applications granted | 97% |
| 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 West Oxfordshire District Council's own, from MHCLG live table PS2 for the year to 31 March 2026.
Eynsham and Cassington's roofs set the brief. The borough is built largely from late-1960s and early-1970s houses (18% of 3,040 homes), Victorian and earlier houses (15%) and late-1950s and early-1960s houses (15%), and its lofts sit under shallow-pitched roofs and integral garages typical of that period's building and steeply pitched slate roofs, valley gutters and party parapets typical of pre-1900 building — the geometry that decides whether a rear dormer, a hip-to-gable or a mansard gives you the headroom you want. West Oxfordshire District Council assesses loft proposals against West Oxfordshire District 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 West Oxfordshire District Council can verify them. Eynsham and Cassington contains Cassington Conservation Area, Eynsham Conservation Area conservation areas (Cassington Conservation Area designated 1992), 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.
Eynsham and Cassington also carries protected streets — Cassington Conservation Area and Eynsham Conservation Area among them. West Oxfordshire District Council has 84 recorded Article 4 directions, removing permitted development for painting the exterior and gates, walls and fences — check the address before assuming PD applies in Eynsham and Cassington. We check your address against those designations before a line is drawn.
Many Eynsham and Cassington 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 West Oxfordshire District Council if any of these apply:
We draw the roof line, the ridge height and the neighbour's daylight on the page — the relationships West Oxfordshire District 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 West Oxfordshire District Council's real householder decision record, pulled from official planning statistics and updated as new data lands. West Oxfordshire District Council granted 97% of its householder applications in the year to 31 March 2026, and Cassington Conservation Area 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 Cassington, Eynsham and South Leigh and High Cogges, 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-pitched roofs and integral garages typical of that period's building, that is usually the most efficient use of the roof; where the stock is steeply pitched slate roofs, valley gutters and party parapets typical of pre-1900 building, a hip-to-gable followed by a rear dormer unlocks far more space, though it needs a full application.
The 3,040 homes here are 18% 1965-1972, 15% pre-1900, 15% 1955-1964, 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 West Oxfordshire District 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 Eynsham and Cassington roofs come up most often:
Loft conversion drawings for Cassington's conservation area designated in 1992 — measured, volume-checked and drawn to West Oxfordshire District Council's guidance.
Loft conversion drawings for Eynsham's conservation area designated in 1975 — measured, volume-checked and drawn to West Oxfordshire District Council's guidance.
Loft conversion drawings for South Leigh and High Cogges's civil parish within Eynsham and Cassington — measured, volume-checked and drawn to West Oxfordshire District Council's guidance.
Loft conversion drawings for Cassington's civil parish within Eynsham and Cassington — measured, volume-checked and drawn to West Oxfordshire District Council's guidance.
Loft conversion drawings for Eynsham's civil parish within Eynsham and Cassington — measured, volume-checked and drawn to West Oxfordshire District Council's guidance.
The right loft in Eynsham and Cassington 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 West Oxfordshire District 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 Cassington Conservation Area and Eynsham Conservation Area and Article 4 directions can remove permitted-development rights.
A fixed process built around how West Oxfordshire District Council validates and decides householder loft applications — most drawings are submission-ready within seven days of survey.
Tell us your Eynsham and Cassington 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 West Oxfordshire District 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 West Oxfordshire District Council's roof-alteration guidance.
We submit the certificate or application, manage validation and case-officer queries, and revise the drawings free until West Oxfordshire District 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 Eynsham and Cassington the main exceptions are hip-to-gable conversions, dormers visible from the highway, and homes in conservation areas such as Cassington Conservation Area and Eynsham Conservation Area or on streets with an Article 4 direction. West Oxfordshire District Council is the decision-maker.
Generally no. In conservation areas including Cassington Conservation Area and Eynsham Conservation Area, Class B permitted-development rights for lofts are removed, so a rear dormer that would be lawful elsewhere needs a full application to West Oxfordshire District Council. West Oxfordshire District Council has 84 recorded Article 4 directions, removing permitted development for painting the exterior and gates, walls and fences — check the address before assuming PD applies in Eynsham and Cassington. We check your exact address before drawing.
On shallow-pitched roofs and integral garages typical of that period's building, common across Eynsham and Cassington, a rear dormer is usually the most efficient conversion and often permitted development. Where the roof is steeply pitched slate roofs, valley gutters and party parapets typical of pre-1900 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. West Oxfordshire District Council is the decision-maker.
A householder planning application in Eynsham and Cassington 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. West Oxfordshire District Council is the decision-maker.
If your dormer is permitted development, a lawful development certificate from West Oxfordshire District 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 Eynsham and Cassington address specifically.
Every roof is different, so we quote each Eynsham and Cassington project individually — a fixed, no-obligation price back within one working day. The quote covers the full drawing pack with free revisions until West Oxfordshire District 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.