Dormer, hip-to-gable and mansard loft conversion drawings for Chew Valley homes — prepared to Bath and North East Somerset Council's design guidance, delivered in days and revised free until your decision lands, with a free approval-odds score first.
Bath and North East Somerset Council granted 97% of the householder planning decisions it made in its latest published year — 10 points above the 87% England-wide householder average. Chew Valley contains Chew Magna, Chew Stoke, Compton Martin conservation areas (Chew Magna designated 1978), 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.
The permitted-development ceilings are fixed: 40m³ of new roof volume for a terraced loft and 50m³ for a semi or detached house under Class B, plus a 3m single-storey rear extension on a terrace or 4m on a detached house under Class A. In conservation areas such as Chew Magna, Chew Stoke and Compton Martin those rights are removed, so we confirm your exact address before a line is drawn. A validated householder application in Chew Valley is determined against an 8-week statutory target.
Chew Magna (conservation area designated in 1978), Chew Stoke (conservation area designated in 1989), Compton Martin (conservation area designated in 1993), Stanton Drew (conservation area designated in 1990), Ubley (conservation area designated in 1990), Chew Magna (civil parish within Chew Valley), Chew Stoke (civil parish within Chew Valley), Compton Martin (civil parish within Chew Valley), Nempnett Thrubwell (civil parish within Chew Valley), Norton Malreward (civil parish within Chew Valley) and Stanton Drew (civil parish within Chew Valley) — these are the Chew Valley pockets our drawings cover most. Heritage designations here include Chew Magna, Chew Stoke, Compton Martin, Stanton Drew and Ubley. Bath and North East Somerset Council weighs each proposal against the adopted Bath and North East Somerset local plan and Bath and North East Somerset Council's design guidance for householder work, where the 2,790 homes here are 33% pre-1900, 13% 1965-1972, 8% 1955-1964, 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-pitched roofs and integral garages typical of that period's building, over Victorian and earlier houses (33% of 2,790 homes), late-1960s and early-1970s houses (13%) and late-1950s and early-1960s houses (8%).
Before anything is drawn we check your address against the designations that apply in Chew Valley: Chew Magna (conservation area designated in 1978), Chew Stoke (conservation area designated in 1989), Compton Martin (conservation area designated in 1993), Stanton Drew (conservation area designated in 1990) and Ubley (conservation area designated in 1990). Inside those boundaries permitted development is curtailed and Bath and North East Somerset 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, Chew Valley takes in Chew Magna, Chew Stoke, Compton Martin, Nempnett Thrubwell, Norton Malreward and Stanton Drew. No Article 4 direction is recorded for Bath and North East Somerset Council, but Chew Valley's 5 conservation areas still limit permitted development on those streets.
On stock, Chew Valley is Victorian and earlier houses (33% of 2,790 homes), late-1960s and early-1970s houses (13%) and late-1950s and early-1960s houses (8%) — which is why steeply pitched slate roofs, valley gutters and party parapets typical of pre-1900 building and shallow-pitched roofs and integral garages typical of that period's building govern what a loft or rear projection can realistically be. Bath and North East Somerset Council decided 808 householder applications in the latest published year and granted 97%, with 50% issued inside the eight-week target. That decision record, not a national figure, is what we design to.
The full build-period split for Chew Valley runs pre-1900 33% (930 homes), 1900-1918 1% (30 homes), 1919-1929 4% (120 homes), 1930-1939 4% (120 homes), 1945-1954 5% (140 homes), 1955-1964 8% (220 homes), 1965-1972 13% (370 homes), 1973-1982 3% (90 homes), 1983-1992 5% (130 homes), 1993-1999 5% (150 homes) and 2000-2008 5% (130 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.
Bath and North East Somerset Council also decides for Bathavon North, Bathavon South, Mendip, Midsomer Norton North, Newbridge, Publow & Whitchurch and Saltford, so a decision in Chew Valley 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 Chew Valley and Bath and North East Somerset Council. These are the numbers that decide what is realistic on your street, so we work from them rather than from national averages.
| Measure | Chew Valley |
|---|---|
| Dwellings recorded | 2,790 |
| Built pre-1900 | 930 (33%) |
| Built 1900-1918 | 30 (1%) |
| Built 1919-1929 | 120 (4%) |
| Built 1930-1939 | 120 (4%) |
| Built 1945-1954 | 140 (5%) |
| Built 1955-1964 | 220 (8%) |
| Built 1965-1972 | 370 (13%) |
| Built 1973-1982 | 90 (3%) |
| Built 1983-1992 | 130 (5%) |
| Built 1993-1999 | 150 (5%) |
| Built 2000-2008 | 130 (5%) |
| Built before 1919 | 34% |
| Built 1919–1939 | 9% |
| Built 1945–2008 | 44% |
| Conservation areas in Chew Valley | 5 (Chew Magna, Chew Stoke…) |
| Conservation areas district-wide | 35 |
| Article 4 directions recorded | 0 |
| Householder applications decided | 808 |
| Householder applications granted | 97% |
| Decided within 8 weeks | 50% |
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 Bath and North East Somerset Council's own, from MHCLG live table PS2 for the year to 31 March 2026.
Chew Valley's roofs set the brief. The borough is built largely from Victorian and earlier houses (33% of 2,790 homes), late-1960s and early-1970s houses (13%) and late-1950s and early-1960s houses (8%), and its lofts sit under steeply pitched slate roofs, valley gutters and party parapets typical of pre-1900 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. Bath and North East Somerset Council assesses loft proposals against the adopted Bath and North East Somerset local plan and Bath and North East Somerset Council's design guidance for householder work, 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 Bath and North East Somerset Council can verify them. Chew Valley contains Chew Magna, Chew Stoke, Compton Martin conservation areas (Chew Magna designated 1978), 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.
Chew Valley also carries protected streets — Chew Magna, Chew Stoke, Compton Martin, Stanton Drew and Ubley among them. No Article 4 direction is recorded for Bath and North East Somerset Council, but Chew Valley's 5 conservation areas still limit permitted development on those streets. We check your address against those designations before a line is drawn.
Many Chew Valley 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 Bath and North East Somerset Council if any of these apply:
We draw the roof line, the ridge height and the neighbour's daylight on the page — the relationships Bath and North East Somerset 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 Bath and North East Somerset Council's real householder decision record, pulled from official planning statistics and updated as new data lands. Bath and North East Somerset Council granted 97% of its householder applications in the year to 31 March 2026, and Chew Magna 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 Chew Magna, Chew Stoke and Compton Martin, 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-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 2,790 homes here are 33% pre-1900, 13% 1965-1972, 8% 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 Bath and North East Somerset 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 Chew Valley roofs come up most often:
Loft conversion drawings for Chew Magna's conservation area designated in 1978 — measured, volume-checked and drawn to Bath and North East Somerset Council's guidance.
Loft conversion drawings for Chew Stoke's conservation area designated in 1989 — measured, volume-checked and drawn to Bath and North East Somerset Council's guidance.
Loft conversion drawings for Compton Martin's conservation area designated in 1993 — measured, volume-checked and drawn to Bath and North East Somerset Council's guidance.
Loft conversion drawings for Stanton Drew's conservation area designated in 1990 — measured, volume-checked and drawn to Bath and North East Somerset Council's guidance.
Loft conversion drawings for Ubley's conservation area designated in 1990 — measured, volume-checked and drawn to Bath and North East Somerset Council's guidance.
Loft conversion drawings for Chew Magna's civil parish within Chew Valley — measured, volume-checked and drawn to Bath and North East Somerset Council's guidance.
The right loft in Chew Valley 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 Bath and North East Somerset 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 Chew Magna and Chew Stoke and Article 4 directions can remove permitted-development rights.
A fixed process built around how Bath and North East Somerset Council validates and decides householder loft applications — most drawings are submission-ready within seven days of survey.
Tell us your Chew Valley 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 Bath and North East Somerset 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 Bath and North East Somerset Council's roof-alteration guidance.
We submit the certificate or application, manage validation and case-officer queries, and revise the drawings free until Bath and North East Somerset 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 Chew Valley the main exceptions are hip-to-gable conversions, dormers visible from the highway, and homes in conservation areas such as Chew Magna and Chew Stoke or on streets with an Article 4 direction. Bath and North East Somerset Council is the decision-maker.
Generally no. In conservation areas including Chew Magna and Chew Stoke, Class B permitted-development rights for lofts are removed, so a rear dormer that would be lawful elsewhere needs a full application to Bath and North East Somerset Council. No Article 4 direction is recorded for Bath and North East Somerset Council, but Chew Valley's 5 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 Chew Valley, 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. Bath and North East Somerset Council is the decision-maker.
A householder planning application in Chew Valley 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. Bath and North East Somerset Council is the decision-maker.
If your dormer is permitted development, a lawful development certificate from Bath and North East Somerset 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 Chew Valley address specifically.
Every roof is different, so we quote each Chew Valley project individually — a fixed, no-obligation price back within one working day. The quote covers the full drawing pack with free revisions until Bath and North East Somerset 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.