Two-storey extension drawings for Chew Valley homes — bedroom above, living space below, drawn against the 3-metre projection and 7-metre boundary rules and to Bath and North East Somerset Council's design guidance, delivered in days and revised free until your decision.
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.
Adding at first floor changes the question the case officer asks. A single-storey extension is judged mostly on daylight and garden loss; a two-storey extension is judged on overlooking, bulk against the neighbouring roofline, and whether it reads as part of the house or bolted onto it. Chew Valley is largely 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 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 set what a matching roof actually means here.
The permitted-development route exists but is narrow: 3 metres of rear projection, a 7-metre stand-off from the rear boundary, eaves and ridge no higher than the original, and side-facing upper windows obscure-glazed and non-opening below 1.7 metres above floor level. Most two-storey schemes fail one of those, usually the 7-metre boundary rule on a shorter garden, and go in as a full application instead. We establish which route applies before designing, because it changes the drawing set.
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. 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.
Some two-storey rear extensions are permitted development. You will need a full application to Bath and North East Somerset Council if any of these apply:
We set the projection and boundary distance on the site plan, prove the roof-pitch match on the elevations, and specify obscure glazing on the side windows — the three things Bath and North East Somerset Council checks first — then submit a validation-complete pack.
Below is Bath and North East Somerset Council's real householder decision record, drawn from official planning statistics and refreshed 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. Two-storey schemes attract more neighbour comment than any other householder work, so the overlooking and daylight case has to be made on the drawings.
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 schemes that succeed set the first floor back from the ground floor, keep the ridge below the original, and treat the flank wall as blank or obscure-glazed. On victorian and earlier houses (33% of 2,790 homes), matching the eaves line matters more than matching the brick: an extension that carries the existing eaves through reads as original even in a different material.
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 45-degree daylight test from the neighbour's nearest habitable window, show the window positions in section, and set out the steel and foundation implications early — a two-storey extension changes the load path, so the structural design and the planning design have to be developed together rather than in sequence.
We draw two-storey extensions across Chew Valley. A few of the areas where they come up most often:
Two storey extension drawings for Chew Magna — conservation area designated in 1978 — dimensioned against the 3m and 7m limits and drawn to Bath and North East Somerset Council's guidance.
Two storey extension drawings for Chew Stoke — conservation area designated in 1989 — dimensioned against the 3m and 7m limits and drawn to Bath and North East Somerset Council's guidance.
Two storey extension drawings for Compton Martin — conservation area designated in 1993 — dimensioned against the 3m and 7m limits and drawn to Bath and North East Somerset Council's guidance.
Two storey extension drawings for Stanton Drew — conservation area designated in 1990 — dimensioned against the 3m and 7m limits and drawn to Bath and North East Somerset Council's guidance.
Two storey extension drawings for Ubley — conservation area designated in 1990 — dimensioned against the 3m and 7m limits and drawn to Bath and North East Somerset Council's guidance.
Two storey extension drawings for Chew Magna — civil parish within Chew Valley — dimensioned against the 3m and 7m limits and drawn to Bath and North East Somerset Council's guidance.
The first-floor limits are tighter than the ground-floor ones. This is how the common cases compare.
| Scheme | Permitted development? | Deciding limit | What Bath and North East Somerset Council checks |
|---|---|---|---|
| Two-storey rear, 3m projection, 7m+ to boundary | Often yes | 3m projection / 7m boundary | Roof match, side-window glazing |
| Two-storey rear, under 7m to boundary | No — full application | Rear-boundary distance | Overlooking, daylight, garden loss |
| Two-storey side extension | No — full application | Side elevation | Gap to boundary, street rhythm |
| Two-storey wraparound | No — full application | Combined footprint | Bulk, massing, neighbour amenity |
| Any two-storey on designated land | No — full application | Designation | Character and appearance |
Limits from the GPDO 2015, Schedule 2, Part 1, Class A — two-storey rear extension conditions.
A fixed process built around how Bath and North East Somerset Council validates and decides two-storey applications.
Send us your Chew Valley postcode and garden depth. We measure the 7-metre boundary rule against your plot, confirm designation status, and score your odds against live Bath and North East Somerset Council decisions.
We measure the original rear wall, eaves and ridge heights, garden depth and every neighbouring window that faces the site — the inputs the daylight and overlooking case is built from.
Chartered designers develop the two-storey addition to your brief with the roof and eaves resolved, and we coordinate the load path so the structural scheme and the planning scheme are the same building.
We submit the application, manage validation and case-officer queries, and revise the drawings free until Bath and North East Somerset Council issues its decision.
Often, but not always. A two-storey rear extension can be permitted development if it projects no more than 3 metres, sits at least 7 metres from the rear boundary, does not exceed the existing eaves and ridge, and has obscure-glazed non-opening side windows below 1.7 metres. In Chew Valley, the 7-metre rule is what most commonly forces a full application to Bath and North East Somerset Council.
No part of a permitted-development two-storey rear extension may come within 7 metres of the boundary opposite the rear wall of the house. It exists to protect the neighbour behind you from being overlooked at first floor. On shorter Chew Valley gardens this is decisive, and we measure it on survey before any design work rather than discovering it at validation. Bath and North East Somerset Council is the decision-maker.
Not under permitted development — two-storey side extensions always need a full application to Bath and North East Somerset Council. They are assessed on the gap to the boundary, whether the street's rhythm of spaces between houses survives, and whether the extension is subordinate to the original. Setting the first floor back from the front building line and down from the ridge is what usually makes the difference. This applies to your Chew Valley address specifically.
Overlooking is the most common objection, and it is answerable on the drawings. We position habitable-room windows away from neighbouring gardens, obscure-glaze and fix shut anything on the flank below 1.7 metres, and show the sight lines in section. Where the geometry is tight, a rooflight or a high-level window gives the same daylight without the mutual overlooking that draws objections. This applies to your Chew Valley address specifically. Bath and North East Somerset Council is the decision-maker.
Almost certainly. Excavating within 3 metres of a neighbouring structure and building on or up to the boundary both trigger the Party Wall etc. Act 1996, and a two-storey extension usually does both. It is entirely separate from Bath and North East Somerset Council's planning decision, so we flag the notice period early and detail the junction on the drawings. This applies to your Chew Valley address specifically.
Yes. Adding a floor changes the load path from roof to foundation, so beams, padstones and foundation depths all need designing and calculating for building control. Planning and building regulations are separate consents, and the structural set is what building control assesses — we prepare both so the approved scheme is the buildable one. This applies to your Chew Valley address specifically. Bath and North East Somerset Council is the decision-maker.
We quote each Chew Valley two-storey extension individually, because plot depth, roof form and structural complexity vary house to house, and send a fixed, no-obligation quote within one working day. It covers the drawing pack with free revisions until Bath and North East Somerset Council approves. Call 020 7864 7245 to start.
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