Single-storey, double-storey, rear and side extension drawings for Caldecote homes — measured to South Cambridgeshire District Council's design guidance, delivered in days and revised free until your decision, with a free approval-odds check before you commit.
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. Caldecote contains Bourn, Bourn Caxton End, Caldecote conservation areas (Bourn designated 1997), so materials, fenestration and roof form are assessed against the appraisal, which is where a policy-literate drawing pack earns its keep. Its dominant 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. Caldecote carries at least one Article 4 direction, and conservation areas including Bourn, Bourn Caxton End and Caldecote remove those rights outright, so we confirm your exact address before a line is drawn. A validated householder application in Caldecote is determined against an 8-week statutory target.
Bourn (conservation area designated in 1997), Bourn Caxton End (conservation area designated in 1997), Caldecote (conservation area designated in 1988), Kingston (conservation area designated in 1974), Little Gransden (conservation area designated in 2006), Kingston (civil parish within Caldecote), Little Gransden (civil parish within Caldecote), Longstowe (civil parish within Caldecote), Bourn (civil parish within Caldecote) and Childerley (civil parish within Caldecote) — these are the Caldecote pockets our drawings cover most. Heritage designations here include Bourn, Bourn Caxton End, Caldecote, Kingston and Little Gransden. South Cambridgeshire District Council weighs each proposal against South Cambridgeshire District Council's adopted local plan and its householder design guidance, where the 1,350 homes here are 32% 2000-2008, 8% 1955-1964, 7% 1973-1982, 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 gabled roofs typical of that period's building, over 2000s houses and apartments (32% of 1,350 homes), late-1950s and early-1960s houses (8%) and 1970s and early-1980s houses (7%).
Caldecote's designated heritage is specific, and it is the first thing we check against your address: Bourn (conservation area designated in 1997), Bourn Caxton End (conservation area designated in 1997), Caldecote (conservation area designated in 1988), Kingston (conservation area designated in 1974) and Little Gransden (conservation area designated in 2006). 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, Caldecote takes in Kingston, Little Gransden, Longstowe, Bourn and Childerley. 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 Caldecote.
On stock, Caldecote is 2000s houses and apartments (32% of 1,350 homes), late-1950s and early-1960s houses (8%) and 1970s and early-1980s houses (7%) — which is why trussed-rafter roofs typical of 2000s building and shallow gabled roofs typical of that period's 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. Those are the numbers our drawings are prepared against.
The full build-period split for Caldecote runs pre-1900 6% (80 homes), 1900-1918 1% (10 homes), 1919-1929 1% (20 homes), 1930-1939 3% (40 homes), 1945-1954 1% (20 homes), 1955-1964 8% (110 homes), 1965-1972 4% (50 homes), 1973-1982 7% (90 homes), 1983-1992 4% (60 homes), 1993-1999 3% (40 homes) and 2000-2008 32% (430 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, Cottenham, Fen Ditton & Fulbourn, Foxton, Girton and Hardwick, so a decision in Caldecote 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 Caldecote 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 | Caldecote |
|---|---|
| Dwellings recorded | 1,350 |
| Built pre-1900 | 80 (6%) |
| Built 1900-1918 | 10 (1%) |
| Built 1919-1929 | 20 (1%) |
| Built 1930-1939 | 40 (3%) |
| Built 1945-1954 | 20 (1%) |
| Built 1955-1964 | 110 (8%) |
| Built 1965-1972 | 50 (4%) |
| Built 1973-1982 | 90 (7%) |
| Built 1983-1992 | 60 (4%) |
| Built 1993-1999 | 40 (3%) |
| Built 2000-2008 | 430 (32%) |
| Built before 1919 | 7% |
| Built 1919–1939 | 4% |
| Built 1945–2008 | 59% |
| Conservation areas in Caldecote | 5 (Bourn, Bourn Caxton End…) |
| 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.
Caldecote homes come in a handful of recurring shapes, and each one points to a different extension. The borough is built largely from 2000s houses and apartments (32% of 1,350 homes), late-1950s and early-1960s houses (8%) and 1970s and early-1980s houses (7%), so a Victorian terrace usually wants a rear or side-return infill, while an interwar semi has room for a wider single-storey wrap or a two-storey side addition. South Cambridgeshire District Council judges every one of them against South Cambridgeshire District Council's adopted local plan and its householder design guidance, weighing footprint, height and the impact on the house next door before it looks at the elevations.
That is why the drawings decide the outcome. We set the extension depth against the permitted-development limits precisely, keep the eaves and ridge within the allowances, and plot the 45-degree daylight lines to the neighbours' windows so the case officer can see the amenity test is passed. Caldecote contains Bourn, Bourn Caxton End, Caldecote conservation areas (Bourn designated 1997), so materials, fenestration and roof form are assessed against the appraisal, so we design around it from the first sketch rather than discover it at validation.
Caldecote also protects whole streets — Bourn, Bourn Caxton End, Caldecote, Kingston and Little Gransden among them. 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 Caldecote. On designated land the larger-home extension route and most side extensions stop being permitted development, so we confirm your address against those layers before drawing a line.
Plenty of Caldecote extensions are permitted development and need no planning application — a single-storey rear extension within the depth and height limits is the common case. You will normally need to apply to South Cambridgeshire District Council if any of these apply:
We draw the footprint, the ridge and eaves heights and the neighbours' daylight on the page — the relationships South Cambridgeshire District Council's officers weigh first — and submit a validation-complete pack, whether that is a lawful development certificate, a prior-approval notification or a full householder application.
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 Bourn shapes what is approved here. A complete, policy-literate extension pack anticipates those pressure points before submission, which is why professionally drawn applications are decided faster and refused less often than DIY ones.
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 Bourn, Bourn Caxton End and Caldecote, the extension that lands most often is the single-storey rear addition — a glazed kitchen-diner across the back of the house, kept within the permitted-development depth or taken to a full application where the ground floor wants more. On the borough's 2000s houses and apartments (32% of 1,350 homes), a side-return infill frequently pairs with it to square off the plan; on wider 1970s and early-1980s houses (7%), a two-storey side or rear extension can add a bedroom above without swallowing the garden.
The 1,350 homes here are 32% 2000-2008, 8% 1955-1964, 7% 1973-1982, which is what sets the realistic roof and rear-projection options. We size the extension to the amenity and daylight tests, match the roof and materials to the host house, and keep enough garden to satisfy South Cambridgeshire District Council's space standards — so the scheme answers the borough's questions before an objection can raise them. Where permitted-development rights are used up or removed, we prepare the householder application to the council's extension design guidance instead.
We draw extensions on every street in the borough. A few of the neighbourhoods where Caldecote projects come up most often:
Extension drawings for Bourn's conservation area designated in 1997 — footprint-checked, daylight-tested and drawn to South Cambridgeshire District Council's guidance.
Extension drawings for Bourn Caxton End's conservation area designated in 1997 — footprint-checked, daylight-tested and drawn to South Cambridgeshire District Council's guidance.
Extension drawings for Caldecote's conservation area designated in 1988 — footprint-checked, daylight-tested and drawn to South Cambridgeshire District Council's guidance.
Extension drawings for Kingston's conservation area designated in 1974 — footprint-checked, daylight-tested and drawn to South Cambridgeshire District Council's guidance.
Extension drawings for Little Gransden's conservation area designated in 2006 — footprint-checked, daylight-tested and drawn to South Cambridgeshire District Council's guidance.
Extension drawings for Kingston's civil parish within Caldecote — footprint-checked, daylight-tested and drawn to South Cambridgeshire District Council's guidance.
The right extension in Caldecote depends on your house type and how much garden you can give up. This is how the main options compare on planning route and what they add.
| Extension type | Permitted development? | What it adds | What South Cambridgeshire District Council checks |
|---|---|---|---|
| Single-storey rear | Often, within 3m/4m depth (6m/8m via prior approval) | Bigger kitchen-diner across the back | Depth, height, neighbour daylight (45°) |
| Side-return infill | Sometimes, if within width and height limits | Squares off an L-shaped ground floor | Width vs the original house, glazing to boundary |
| Two-storey rear/side | No — full application | Extra bedroom or bathroom above | Bulk, overlooking, 7m rear-boundary gap |
| Wraparound (rear + side) | No — full application | Whole-width open-plan ground floor | Combined footprint and garden retained |
Route depends on your street — conservation areas such as Bourn and Bourn Caxton End and Article 4 directions can remove permitted-development rights.
A fixed process built around how South Cambridgeshire District Council validates and decides householder extension applications — most drawings are submission-ready within seven days of survey.
Tell us your Caldecote postcode and house type. We confirm your conservation and Article 4 status, how much permitted-development depth you have left, and score your odds against live South Cambridgeshire District Council decisions.
We measure the existing footprint, floor and eaves levels, boundary distances and the neighbours' window positions — the numbers the depth limits and daylight tests depend on.
Chartered designers develop the single-storey, two-storey or side extension to your brief, drawn inside the permitted-development limits or to South Cambridgeshire District Council's extension design guidance.
We submit the certificate, prior-approval notice or application, manage validation and case-officer queries, and revise the drawings free until South Cambridgeshire District Council issues its decision.
Not always. A single-storey rear extension up to 3 metres deep on a terrace or semi, or 4 metres on a detached house, and no higher than 4 metres, is usually permitted development. In Caldecote you will need to apply to South Cambridgeshire District Council for two-storey extensions, side extensions wider than half the house, anything forward of the front wall, deeper rear extensions under the larger-home prior-approval route, and any extension in a conservation area such as Bourn and Bourn Caxton End.
Standard permitted development allows 3 metres on a terraced or semi-detached house and 4 metres on a detached one. The larger-home extension scheme can double that to 6 or 8 metres, but it needs a prior-approval notification to South Cambridgeshire District Council and a neighbour-consultation period, and it does not apply on designated land such as Caldecote's conservation areas. We confirm which route your property qualifies for before drawing.
Two-storey and double-storey extensions almost always need a full householder application to South Cambridgeshire District Council, because they fall outside permitted development on most homes. The council looks closely at bulk, overlooking of neighbours and the 7-metre gap a two-storey rear extension must keep from the rear boundary. We design to those tests and show the daylight and privacy angles on the drawings. This applies to your Caldecote address specifically.
A householder planning application in Caldecote runs to a statutory eight-week target, a larger-home prior-approval notification to around six weeks including the neighbour-consultation period, and a lawful development certificate to eight weeks. Incomplete submissions stall at validation, so we submit a complete pack and manage officer queries to keep the decision on schedule. South Cambridgeshire District Council is the decision-maker.
Yes — planning permission and building regulations are separate consents, and almost every extension needs both. Planning governs whether you can build it; building control governs how it is built, covering structure, insulation, drainage and fire safety. We prepare the building-regulations drawings alongside the planning set so South Cambridgeshire District Council's building control or an approved inspector can sign the work off. This applies to your Caldecote address specifically.
Every house and brief is different, so we price each Caldecote extension individually and send a fixed, no-obligation quote back within one working day. It covers the full drawing pack with free revisions until South Cambridgeshire District Council approves, and we tell you upfront whether your extension qualifies as permitted development. Call 020 7864 7245 to get started.
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