Two-storey extension drawings for North West Cosford homes — bedroom above, living space below, drawn against the 3-metre projection and 7-metre boundary rules and to Babergh District Council's design guidance, delivered in days and revised free until your decision.
Babergh District Council granted 91% of the householder planning decisions it made in its latest published year — 4 points above the 87% England-wide householder average. North West Cosford contains Bildeston, Brettenham, Kettlebaston conservation areas (Bildeston designated 1973), 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.
Under Class B, a rear dormer stays permitted development up to 40m³ of added roof volume on a terrace or 50m³ on a semi-detached or detached house, while Class A allows a single-storey rear extension of 3m beyond the original rear wall on a terrace and 4m on a detached house before a full application is needed. In conservation areas such as Bildeston, Brettenham and Kettlebaston those rights are removed, so we confirm your exact address before a line is drawn. A validated householder application in North West Cosford is determined against an 8-week statutory target.
Bildeston (conservation area designated in 1973), Brettenham (conservation area designated in 1973), Kettlebaston (conservation area designated in 1981), Hitcham (civil parish within North West Cosford), Kettlebaston (civil parish within North West Cosford), Preston St. Mary (civil parish within North West Cosford), Thorpe Morieux (civil parish within North West Cosford), Wattisham (civil parish within North West Cosford) and Bildeston (civil parish within North West Cosford) — these are the North West Cosford pockets our drawings cover most. Heritage designations here include Bildeston, Brettenham and Kettlebaston. Babergh District Council weighs each proposal against Babergh District Council's adopted local plan and its householder design guidance, where the 2,270 homes here are 36% pre-1900, 8% 1965-1972, 7% 1983-1992, 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 (36% of 2,270 homes), late-1960s and early-1970s houses (8%) and 1980s estate houses (7%).
North West Cosford's designated heritage is specific, and it is the first thing we check against your address: Bildeston (conservation area designated in 1973), Brettenham (conservation area designated in 1973) and Kettlebaston (conservation area designated in 1981). Inside those boundaries permitted development is curtailed and Babergh 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, North West Cosford takes in Hitcham, Kettlebaston, Preston St. Mary, Thorpe Morieux, Wattisham and Bildeston. No Article 4 direction is recorded for Babergh District Council, but North West Cosford's 3 conservation areas still limit permitted development on those streets.
On stock, North West Cosford is Victorian and earlier houses (36% of 2,270 homes), late-1960s and early-1970s houses (8%) and 1980s estate houses (7%) — 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. Babergh District Council decided 359 householder applications in the latest published year and granted 91%, with 75% issued inside the eight-week target. Those are the numbers our drawings are prepared against.
The full build-period split for North West Cosford runs pre-1900 36% (820 homes), 1900-1918 1% (20 homes), 1919-1929 1% (30 homes), 1930-1939 4% (100 homes), 1945-1954 5% (120 homes), 1955-1964 5% (120 homes), 1965-1972 8% (180 homes), 1973-1982 6% (140 homes), 1983-1992 7% (150 homes), 1993-1999 4% (100 homes) and 2000-2008 7% (150 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.
Babergh District Council also decides for Box Vale, Brett Vale, Chadacre, Ganges, Lavenham, Long Melford, Orwell and South East Cosford, so a decision in North West Cosford 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 North West Cosford and Babergh 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 | North West Cosford |
|---|---|
| Dwellings recorded | 2,270 |
| Built pre-1900 | 820 (36%) |
| Built 1900-1918 | 20 (1%) |
| Built 1919-1929 | 30 (1%) |
| Built 1930-1939 | 100 (4%) |
| Built 1945-1954 | 120 (5%) |
| Built 1955-1964 | 120 (5%) |
| Built 1965-1972 | 180 (8%) |
| Built 1973-1982 | 140 (6%) |
| Built 1983-1992 | 150 (7%) |
| Built 1993-1999 | 100 (4%) |
| Built 2000-2008 | 150 (7%) |
| Built before 1919 | 37% |
| Built 1919–1939 | 6% |
| Built 1945–2008 | 42% |
| Conservation areas in North West Cosford | 3 (Bildeston, Brettenham…) |
| Conservation areas district-wide | 58 |
| Article 4 directions recorded | 0 |
| Householder applications decided | 359 |
| Householder applications granted | 91% |
| 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 Babergh District 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. North West Cosford is largely Victorian and earlier houses (36% of 2,270 homes), late-1960s and early-1970s houses (8%) and 1980s estate houses (7%), 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.
North West Cosford contains Bildeston, Brettenham, Kettlebaston conservation areas (Bildeston designated 1973), so materials, fenestration and roof form are assessed against the appraisal. No Article 4 direction is recorded for Babergh District Council, but North West Cosford's 3 conservation areas still limit permitted development on those streets.
Some two-storey rear extensions are permitted development. You will need a full application to Babergh District 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 Babergh District Council checks first — then submit a validation-complete pack.
Below is Babergh District Council's real householder decision record, drawn from official planning statistics and refreshed as new data lands. Babergh District Council granted 91% of its householder applications in the year to 31 March 2026, and Bildeston 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.
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Across Bildeston, Brettenham and Kettlebaston, 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 (36% of 2,270 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 2,270 homes here are 36% pre-1900, 8% 1965-1972, 7% 1983-1992, 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 North West Cosford. A few of the areas where they come up most often:
Two storey extension drawings for Bildeston — conservation area designated in 1973 — dimensioned against the 3m and 7m limits and drawn to Babergh District Council's guidance.
Two storey extension drawings for Brettenham — conservation area designated in 1973 — dimensioned against the 3m and 7m limits and drawn to Babergh District Council's guidance.
Two storey extension drawings for Kettlebaston — conservation area designated in 1981 — dimensioned against the 3m and 7m limits and drawn to Babergh District Council's guidance.
Two storey extension drawings for Hitcham — civil parish within North West Cosford — dimensioned against the 3m and 7m limits and drawn to Babergh District Council's guidance.
Two storey extension drawings for Kettlebaston — civil parish within North West Cosford — dimensioned against the 3m and 7m limits and drawn to Babergh District Council's guidance.
Two storey extension drawings for Preston St. Mary — civil parish within North West Cosford — dimensioned against the 3m and 7m limits and drawn to Babergh District 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 Babergh District 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 Babergh District Council validates and decides two-storey applications.
Send us your North West Cosford postcode and garden depth. We measure the 7-metre boundary rule against your plot, confirm designation status, and score your odds against live Babergh District 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 Babergh District 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 North West Cosford, the 7-metre rule is what most commonly forces a full application to Babergh District 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 North West Cosford gardens this is decisive, and we measure it on survey before any design work rather than discovering it at validation. Babergh District Council is the decision-maker.
Not under permitted development — two-storey side extensions always need a full application to Babergh District 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 North West Cosford 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 North West Cosford address specifically. Babergh District 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 Babergh District Council's planning decision, so we flag the notice period early and detail the junction on the drawings. This applies to your North West Cosford 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 North West Cosford address specifically. Babergh District Council is the decision-maker.
We quote each North West Cosford 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 Babergh District Council approves. Call 020 7864 7245 to start.
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