Two-storey extension drawings for Histon & Impington homes — bedroom above, living space below, drawn against the 3-metre projection and 7-metre boundary rules and to South Cambridgeshire District Council's design guidance, delivered in days and revised free until your decision.
South Cambridgeshire District Council granted 95% of the householder planning decisions it made in its latest published year — 8 points above the 87% England-wide householder average. Histon & Impington contains Histon And Impington - Histon Village, Histon And Impington - Impington St Andrews conservation areas (Histon And Impington - Histon Village designated 1998), so materials, fenestration and roof form are assessed against the appraisal, which is where a policy-literate drawing pack earns its keep. Its mixed housing stock sets the design brief street by street.
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. Histon & Impington carries at least one Article 4 direction, and conservation areas including Histon And Impington - Histon Village and Histon And Impington - Impington St Andrews remove those rights outright, so we confirm your exact address before a line is drawn. A validated householder application in Histon & Impington is determined against an 8-week statutory target.
Histon And Impington - Histon Village (conservation area designated in 1998), Histon And Impington - Impington St Andrews (conservation area designated in 1988), Histon (civil parish within Histon & Impington), Impington (civil parish within Histon & Impington) and Orchard Park (civil parish within Histon & Impington) — these are the Histon & Impington pockets our drawings cover most. Heritage designations here include Histon And Impington - Histon Village and Histon And Impington - Impington St Andrews. South Cambridgeshire District Council weighs each proposal against South Cambridgeshire District Council's adopted local plan and its householder design guidance, where the 4,940 homes here are 11% 2000-2008, 11% 1973-1982, 11% 1993-1999, which is what sets the realistic roof and rear-projection options. On roofs the borough is trussed-rafter roofs typical of 2000s building and shallow trussed roofs typical of 1970s building, over 2000s houses and apartments (11% of 4,940 homes), 1970s and early-1980s houses (11%) and 1990s estate houses (11%).
What is permitted in Histon & Impington turns on designation first, so that is where we start: Histon And Impington - Histon Village (conservation area designated in 1998) and Histon And Impington - Impington St Andrews (conservation area designated in 1988). Inside those boundaries permitted development is curtailed and South Cambridgeshire 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, Histon & Impington takes in Histon, Impington and Orchard Park. South Cambridgeshire District Council has 8 recorded Article 4 directions, removing permitted development for painting the exterior — check the address before assuming PD applies in Histon & Impington.
On stock, Histon & Impington is 2000s houses and apartments (11% of 4,940 homes), 1970s and early-1980s houses (11%) and 1990s estate houses (11%) — which is why trussed-rafter roofs typical of 2000s building and shallow trussed roofs typical of 1970s building govern what a loft or rear projection can realistically be. South Cambridgeshire District Council decided 787 householder applications in the latest published year and granted 95%, with 84% issued inside the eight-week target. We draw to that record rather than to a national average.
The full build-period split for Histon & Impington runs pre-1900 5% (270 homes), 1900-1918 3% (130 homes), 1919-1929 4% (190 homes), 1930-1939 8% (380 homes), 1945-1954 2% (90 homes), 1955-1964 9% (450 homes), 1965-1972 10% (480 homes), 1973-1982 11% (550 homes), 1983-1992 7% (360 homes), 1993-1999 11% (520 homes) and 2000-2008 11% (560 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.
South Cambridgeshire District Council also decides for Balsham, Barrington, Bassingbourn, Caldecote, Cottenham, Fen Ditton & Fulbourn, Foxton and Girton, so a decision in Histon & Impington 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 Beach Road Cottenham, Clay Close Lane, Impington, Land Adjacent To Villa Road Impington and Land Opp. Milestone Farm, Great Chishill. 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 Histon & Impington and South Cambridgeshire 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 | Histon & Impington |
|---|---|
| Dwellings recorded | 4,940 |
| Built pre-1900 | 270 (5%) |
| Built 1900-1918 | 130 (3%) |
| Built 1919-1929 | 190 (4%) |
| Built 1930-1939 | 380 (8%) |
| Built 1945-1954 | 90 (2%) |
| Built 1955-1964 | 450 (9%) |
| Built 1965-1972 | 480 (10%) |
| Built 1973-1982 | 550 (11%) |
| Built 1983-1992 | 360 (7%) |
| Built 1993-1999 | 520 (11%) |
| Built 2000-2008 | 560 (11%) |
| Built before 1919 | 8% |
| Built 1919–1939 | 12% |
| Built 1945–2008 | 61% |
| Conservation areas in Histon & Impington | 2 (Histon And Impington - Histon Village, Histon And Impington - Impington St Andrews) |
| Conservation areas district-wide | 85 |
| Article 4 directions recorded | 8 |
| Householder applications decided | 787 |
| Householder applications granted | 95% |
| Decided within 8 weeks | 84% |
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 South Cambridgeshire 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. Histon & Impington is largely 2000s houses and apartments (11% of 4,940 homes), 1970s and early-1980s houses (11%) and 1990s estate houses (11%), and trussed-rafter roofs typical of 2000s building and shallow trussed roofs typical of 1970s 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.
Histon & Impington contains Histon And Impington - Histon Village, Histon And Impington - Impington St Andrews conservation areas (Histon And Impington - Histon Village designated 1998), so materials, fenestration and roof form are assessed against the appraisal. South Cambridgeshire District Council has 8 recorded Article 4 directions, removing permitted development for painting the exterior — check the address before assuming PD applies in Histon & Impington.
Some two-storey rear extensions are permitted development. You will need a full application to South Cambridgeshire 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 South Cambridgeshire District Council checks first — then submit a validation-complete pack.
Below is South Cambridgeshire District Council's real householder decision record, drawn from official planning statistics and refreshed as new data lands. South Cambridgeshire District Council granted 95% of its householder applications in the year to 31 March 2026, and Histon And Impington - Histon Village 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 Histon And Impington - Histon Village, Histon And Impington - Impington St Andrews and Histon, 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 2000s houses and apartments (11% of 4,940 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 4,940 homes here are 11% 2000-2008, 11% 1973-1982, 11% 1993-1999, 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 Histon & Impington. A few of the areas where they come up most often:
Two storey extension drawings for Histon And Impington - Histon Village — conservation area designated in 1998 — dimensioned against the 3m and 7m limits and drawn to South Cambridgeshire District Council's guidance.
Two storey extension drawings for Histon And Impington - Impington St Andrews — conservation area designated in 1988 — dimensioned against the 3m and 7m limits and drawn to South Cambridgeshire District Council's guidance.
Two storey extension drawings for Histon — civil parish within Histon & Impington — dimensioned against the 3m and 7m limits and drawn to South Cambridgeshire District Council's guidance.
Two storey extension drawings for Impington — civil parish within Histon & Impington — dimensioned against the 3m and 7m limits and drawn to South Cambridgeshire District Council's guidance.
Two storey extension drawings for Orchard Park — civil parish within Histon & Impington — dimensioned against the 3m and 7m limits and drawn to South Cambridgeshire 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 South Cambridgeshire 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 South Cambridgeshire District Council validates and decides two-storey applications.
Send us your Histon & Impington postcode and garden depth. We measure the 7-metre boundary rule against your plot, confirm designation status, and score your odds against live South Cambridgeshire 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 South Cambridgeshire 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 Histon & Impington, the 7-metre rule is what most commonly forces a full application to South Cambridgeshire 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 Histon & Impington gardens this is decisive, and we measure it on survey before any design work rather than discovering it at validation. South Cambridgeshire District Council is the decision-maker.
Not under permitted development — two-storey side extensions always need a full application to South Cambridgeshire 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 Histon & Impington 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 Histon & Impington address specifically. South Cambridgeshire 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 South Cambridgeshire District Council's planning decision, so we flag the notice period early and detail the junction on the drawings. This applies to your Histon & Impington 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 Histon & Impington address specifically. South Cambridgeshire District Council is the decision-maker.
We quote each Histon & Impington 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 South Cambridgeshire District Council approves. Call 020 7864 7245 to start.
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