Single-storey, double-storey, rear and side extension drawings for Nadder Valley homes — measured to Wiltshire Council's design guidance, delivered in days and revised free until your decision, with a free approval-odds check before you commit.
Wiltshire Council granted 96% of the householder planning decisions it made in its latest published year — 9 points above the 87% England-wide householder average. Nadder Valley contains BAPTON/FISHERTON, CHILMARK, DINTON conservation areas (BAPTON/FISHERTON designated 1975), 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. Nadder Valley carries at least one Article 4 direction, and conservation areas including BAPTON/FISHERTON, CHILMARK and DINTON remove those rights outright, so we confirm your exact address before a line is drawn. A validated householder application in Nadder Valley is determined against an 8-week statutory target.
BAPTON/FISHERTON (conservation area designated in 1975), CHILMARK (conservation area designated in 1973), DINTON (conservation area designated in 1989), EAST KNOYLE (conservation area designated in 1975), FONTHILL BISHOP (designated conservation area), HANGING LANGFORD (designated conservation area), HINDON (conservation area designated in 1973), SEMLEY (designated conservation area), STEEPLE LANGFORD (conservation area designated in 1989), TEFFONT MAGNA AND EVIAS (conservation area designated in 1973), WYLYE (conservation area designated in 1975), Hindon (civil parish within Nadder Valley), Berwick St. Leonard (civil parish within Nadder Valley), Dinton (civil parish within Nadder Valley), Chicklade (civil parish within Nadder Valley), Chilmark (civil parish within Nadder Valley) and East Knoyle (civil parish within Nadder Valley) — these are the Nadder Valley pockets our drawings cover most. Heritage designations here include BAPTON/FISHERTON, CHILMARK, DINTON, EAST KNOYLE, FONTHILL BISHOP, HANGING LANGFORD, HINDON, SEMLEY, STEEPLE LANGFORD, TEFFONT MAGNA AND EVIAS and WYLYE. Wiltshire Council weighs each proposal against Wiltshire Council's development plan and the design policies it applies to householder applications, where the 2,810 homes here are 42% pre-1900, 9% 1965-1972, 8% 1945-1954, 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 (42% of 2,810 homes), late-1960s and early-1970s houses (9%) and early postwar houses (8%).
Nadder Valley's designated heritage is specific, and it is the first thing we check against your address: BAPTON/FISHERTON (conservation area designated in 1975), CHILMARK (conservation area designated in 1973), DINTON (conservation area designated in 1989), EAST KNOYLE (conservation area designated in 1975), FONTHILL BISHOP (designated conservation area), HANGING LANGFORD (designated conservation area), HINDON (conservation area designated in 1973), SEMLEY (designated conservation area), STEEPLE LANGFORD (conservation area designated in 1989), TEFFONT MAGNA AND EVIAS (conservation area designated in 1973) and WYLYE (conservation area designated in 1975). Inside those boundaries permitted development is curtailed and Wiltshire 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, Nadder Valley takes in Hindon, Berwick St. Leonard, Dinton, Chicklade, Chilmark and East Knoyle. Wiltshire Council has 48 recorded Article 4 directions, removing permitted development for rear and side extensions and other roof alterations, including rooflights — check the address before assuming PD applies in Nadder Valley.
On stock, Nadder Valley is Victorian and earlier houses (42% of 2,810 homes), late-1960s and early-1970s houses (9%) and early postwar 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. Wiltshire Council decided 1,779 householder applications in the latest published year and granted 96%, with 53% issued inside the eight-week target. Those are the numbers our drawings are prepared against.
The full build-period split for Nadder Valley runs pre-1900 42% (1,180 homes), 1900-1918 2% (50 homes), 1919-1929 1% (40 homes), 1930-1939 4% (100 homes), 1945-1954 8% (220 homes), 1955-1964 7% (200 homes), 1965-1972 9% (240 homes), 1973-1982 6% (180 homes), 1983-1992 6% (170 homes), 1993-1999 5% (140 homes) and 2000-2008 4% (120 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.
Wiltshire Council also decides for Aldbourne & Ramsbury, Amesbury West, Avon Valley, Box & Colerne, By Brook, Corsham Ladbrook, Corsham Pickwick and Corsham Without, so a decision in Nadder 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.
The Article 4 directions recorded for this council include Ashley, Avebury, Baydon 1 and Baydon 2. 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 Nadder Valley and Wiltshire Council. These are the numbers that decide what is realistic on your street, so we work from them rather than from national averages.
| Measure | Nadder Valley |
|---|---|
| Dwellings recorded | 2,810 |
| Built pre-1900 | 1,180 (42%) |
| Built 1900-1918 | 50 (2%) |
| Built 1919-1929 | 40 (1%) |
| Built 1930-1939 | 100 (4%) |
| Built 1945-1954 | 220 (8%) |
| Built 1955-1964 | 200 (7%) |
| Built 1965-1972 | 240 (9%) |
| Built 1973-1982 | 180 (6%) |
| Built 1983-1992 | 170 (6%) |
| Built 1993-1999 | 140 (5%) |
| Built 2000-2008 | 120 (4%) |
| Built before 1919 | 44% |
| Built 1919–1939 | 5% |
| Built 1945–2008 | 45% |
| Conservation areas in Nadder Valley | 11 (BAPTON/FISHERTON, CHILMARK…) |
| Conservation areas district-wide | 245 |
| Article 4 directions recorded | 48 |
| Householder applications decided | 1,779 |
| Householder applications granted | 96% |
| Decided within 8 weeks | 53% |
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 Wiltshire Council's own, from MHCLG live table PS2 for the year to 31 March 2026.
Nadder Valley homes come in a handful of recurring shapes, and each one points to a different extension. The borough is built largely from Victorian and earlier houses (42% of 2,810 homes), late-1960s and early-1970s houses (9%) and early postwar houses (8%), 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. Wiltshire Council judges every one of them against Wiltshire Council's development plan and the design policies it applies to householder applications, 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. Nadder Valley contains BAPTON/FISHERTON, CHILMARK, DINTON conservation areas (BAPTON/FISHERTON designated 1975), 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.
Nadder Valley also protects whole streets — BAPTON/FISHERTON, CHILMARK, DINTON, EAST KNOYLE, FONTHILL BISHOP, HANGING LANGFORD, HINDON, SEMLEY, STEEPLE LANGFORD, TEFFONT MAGNA AND EVIAS and WYLYE among them. Wiltshire Council has 48 recorded Article 4 directions, removing permitted development for rear and side extensions and other roof alterations, including rooflights — check the address before assuming PD applies in Nadder Valley. 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 Nadder Valley 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 Wiltshire Council if any of these apply:
We draw the footprint, the ridge and eaves heights and the neighbours' daylight on the page — the relationships Wiltshire 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 Wiltshire Council's real householder decision record, drawn from official planning statistics and refreshed as new data lands. Wiltshire Council granted 96% of its householder applications in the year to 31 March 2026, and BAPTON/FISHERTON 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 BAPTON/FISHERTON, CHILMARK and DINTON, 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 victorian and earlier houses (42% of 2,810 homes), a side-return infill frequently pairs with it to square off the plan; on wider early postwar houses (8%), a two-storey side or rear extension can add a bedroom above without swallowing the garden.
The 2,810 homes here are 42% pre-1900, 9% 1965-1972, 8% 1945-1954, 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 Wiltshire 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 Nadder Valley projects come up most often:
Extension drawings for BAPTON/FISHERTON's conservation area designated in 1975 — footprint-checked, daylight-tested and drawn to Wiltshire Council's guidance.
Extension drawings for CHILMARK's conservation area designated in 1973 — footprint-checked, daylight-tested and drawn to Wiltshire Council's guidance.
Extension drawings for DINTON's conservation area designated in 1989 — footprint-checked, daylight-tested and drawn to Wiltshire Council's guidance.
Extension drawings for EAST KNOYLE's conservation area designated in 1975 — footprint-checked, daylight-tested and drawn to Wiltshire Council's guidance.
Extension drawings for FONTHILL BISHOP's designated conservation area — footprint-checked, daylight-tested and drawn to Wiltshire Council's guidance.
Extension drawings for HANGING LANGFORD's designated conservation area — footprint-checked, daylight-tested and drawn to Wiltshire Council's guidance.
The right extension in Nadder Valley 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 Wiltshire 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 BAPTON/FISHERTON and CHILMARK and Article 4 directions can remove permitted-development rights.
A fixed process built around how Wiltshire Council validates and decides householder extension applications — most drawings are submission-ready within seven days of survey.
Tell us your Nadder Valley 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 Wiltshire 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 Wiltshire 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 Wiltshire 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 Nadder Valley you will need to apply to Wiltshire 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 BAPTON/FISHERTON and CHILMARK.
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 Wiltshire Council and a neighbour-consultation period, and it does not apply on designated land such as Nadder Valley'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 Wiltshire 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 Nadder Valley address specifically.
A householder planning application in Nadder Valley 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. Wiltshire 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 Wiltshire Council's building control or an approved inspector can sign the work off. This applies to your Nadder Valley address specifically.
Every house and brief is different, so we price each Nadder Valley extension individually and send a fixed, no-obligation quote back within one working day. It covers the full drawing pack with free revisions until Wiltshire 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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