The fast route to a deep single-storey rear extension in Forest of Dean — up to 6 metres on an attached house or 8 on a detached one — via Forest of Dean District Council's prior approval scheme rather than a full planning application.
Forest of Dean District Council granted 98% of the householder planning decisions it made in its latest published year — 11 points above the 87% England-wide householder average. Forest of Dean contains Alvington Conservation Area, Awre Conservation Area, Blakeney Conservation Area conservation areas (Alvington Conservation Area designated 1990), 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. Forest of Dean carries at least one Article 4 direction, and conservation areas including Alvington Conservation Area, Awre Conservation Area and Blakeney Conservation Area remove those rights outright, so we confirm your exact address before a line is drawn. A validated householder application in Forest of Dean is determined against an 8-week statutory target.
Alvington (conservation area designated in 1990), Awre (conservation area designated in 1989), Blakeney (conservation area designated in 1979), Brockweir (conservation area designated in 1989), Dymock (conservation area designated in 1989), English Bicknor (conservation area designated in 1995), Hewelsfield (conservation area designated in 1990), Littledean (conservation area designated in 1988), Berry Hill (ward of Forest of Dean), Dymock (ward of Forest of Dean), Hartpury & Redmarley (ward of Forest of Dean), Longhope & Huntley (ward of Forest of Dean), Newent & Taynton (ward of Forest of Dean), Newnham (ward of Forest of Dean), Pillowell (ward of Forest of Dean) and St. Briavels (ward of Forest of Dean) — these are the Forest of Dean pockets our drawings cover most. Heritage designations here include Alvington Conservation Area, Awre Conservation Area, Blakeney Conservation Area, Brockweir Conservation Area, Dymock Conservation Area, English Bicknor Conservation Area, Hewelsfield Conservation Area and Littledean Conservation Area. Forest of Dean District Council weighs each proposal against the adopted Forest of Dean local plan and Forest of Dean District Council's design guidance for householder work, where the 14,570 homes here are 30% pre-1900, 7% 1973-1982, 5% 1965-1972, 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 trussed roofs typical of 1970s building, over Victorian and earlier houses (30% of 14,570 homes), 1970s and early-1980s houses (7%) and late-1960s and early-1970s houses (5%).
Forest of Dean's designated heritage is specific, and it is the first thing we check against your address: Alvington (conservation area designated in 1990), Awre (conservation area designated in 1989), Blakeney (conservation area designated in 1979), Brockweir (conservation area designated in 1989), Dymock (conservation area designated in 1989), English Bicknor (conservation area designated in 1995), Hewelsfield (conservation area designated in 1990) and Littledean (conservation area designated in 1988). Inside those boundaries permitted development is curtailed and Forest of Dean 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, Forest of Dean takes in Berry Hill, Dymock, Hartpury & Redmarley, Longhope & Huntley, Newent & Taynton, Newnham, Pillowell and St. Briavels. Forest of Dean District Council has 2 recorded Article 4 directions — check the address before assuming PD applies in the district.
On stock, Forest of Dean is Victorian and earlier houses (30% of 14,570 homes), 1970s and early-1980s houses (7%) and late-1960s and early-1970s houses (5%) — which is why steeply pitched slate roofs, valley gutters and party parapets typical of pre-1900 building and shallow trussed roofs typical of 1970s building govern what a loft or rear projection can realistically be. Forest of Dean District Council decided 277 householder applications in the latest published year and granted 98%, with 64% issued inside the eight-week target. Those are the numbers our drawings are prepared against.
The full build-period split for Forest of Dean runs pre-1900 3% (190 homes), 1900-1918 0% (30 homes), 1919-1929 0% (10 homes), 1930-1939 6% (350 homes), 1945-1954 3% (170 homes), 1955-1964 30% (1,850 homes), 1965-1972 33% (1,990 homes), 1973-1982 4% (260 homes), 1983-1992 5% (310 homes), 1993-1999 4% (220 homes) and 2000-2008 3% (170 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.
Forest of Dean District Council also decides for Berry Hill, Dymock, Hartpury & Redmarley, Longhope & Huntley, Newent & Taynton, Newnham, Pillowell and St. Briavels, so a decision in Forest of Dean 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 English Bicknor (land at Redhouse Lane, Murrells Road and Smithy Close) and Newnham (within conservation area). 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 Forest of Dean and Forest of Dean 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 | Forest of Dean |
|---|---|
| Dwellings recorded | 14,570 |
| Built pre-1900 | 190 (3%) |
| Built 1900-1918 | 30 (0%) |
| Built 1919-1929 | 10 (0%) |
| Built 1930-1939 | 350 (6%) |
| Built 1945-1954 | 170 (3%) |
| Built 1955-1964 | 1,850 (30%) |
| Built 1965-1972 | 1,990 (33%) |
| Built 1973-1982 | 260 (4%) |
| Built 1983-1992 | 310 (5%) |
| Built 1993-1999 | 220 (4%) |
| Built 2000-2008 | 170 (3%) |
| Built before 1919 | 32% |
| Built 1919–1939 | 6% |
| Built 1945–2008 | 48% |
| Conservation areas in Forest of Dean | 8 (Alvington Conservation Area, Awre Conservation Area…) |
| Conservation areas district-wide | 27 |
| Article 4 directions recorded | 2 |
| Householder applications decided | 277 |
| Householder applications granted | 98% |
| Decided within 8 weeks | 64% |
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 Forest of Dean District Council's own, from MHCLG live table PS2 for the year to 31 March 2026.
The ordinary Class A limits stop a single-storey rear extension at 3 metres on an attached house and 4 on a detached one. The larger home extension scheme doubles both, on condition that the council is told first. That notification is not an application for permission — the council cannot refuse on design, materials or policy grounds. It can only consider the effect on the amenity of adjoining premises, and only if a neighbour actually objects during the 21-day consultation.
The other conditions still apply and are strict: single storey only, no higher than 4 metres, eaves no higher than the existing eaves, and no more than half the land around the original house covered. It is not available on designated land, so a house in a conservation area such as Alvington Conservation Area and Awre Conservation Area cannot use it at all. Materials must be similar to the existing house, and the extension must not include a veranda, balcony or raised platform.
Forest of Dean is largely Victorian and earlier houses (30% of 14,570 homes), 1970s and early-1980s houses (7%) and late-1960s and early-1970s houses (5%). Forest of Dean contains Alvington Conservation Area, Awre Conservation Area, Blakeney Conservation Area conservation areas (Alvington Conservation Area designated 1990), so materials, fenestration and roof form are assessed against the appraisal, which matters here because an objecting neighbour puts amenity squarely in front of a case officer. Forest of Dean District Council has 2 recorded Article 4 directions — check the address before assuming PD applies in the district.
The scheme is available where all of these hold. Fail any one and it is a full application to Forest of Dean District Council instead:
We prepare the notification pack Forest of Dean District Council needs — plans, elevations, a site plan with the adjoining owners identified — and manage the 21-day neighbour consultation so the 42-day clock is not restarted by an incomplete submission.
Below is Forest of Dean District Council's real householder decision record, drawn from official planning statistics and refreshed as new data lands. Forest of Dean District Council granted 98% of 277 householder decisions in the year to 31 March 2026, 64% of them inside eight weeks. Prior approval turns on neighbour amenity alone, so the drawings that matter are the ones showing the relationship to the boundary.
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 Alvington, Awre and Blakeney, the notifications that clear without objection are the ones that treat the neighbour as the audience. We show the extension in section against the boundary, demonstrate the 45-degree daylight relationship to the nearest habitable window, and where the plot is tight we taper the depth away from the boundary rather than running the full 6 metres to the fence.
The 14,570 homes here are 30% pre-1900, 7% 1973-1982, 5% 1965-1972, which is what sets the realistic roof and rear-projection options. Where an objection does arrive, the council's assessment is narrow: loss of light, outlook and overbearing effect on the adjoining property, nothing else. A pack that has already answered those three points on the drawings usually survives an objection, whereas one that leaves them to the officer's imagination usually does not.
We prepare prior-approval notifications across Forest of Dean. A few of the areas where deep rear extensions come up most often:
Prior approval drawings for Alvington — conservation area designated in 1990 — dimensioned to the 6m and 8m limits and prepared for Forest of Dean District Council's neighbour consultation.
Prior approval drawings for Awre — conservation area designated in 1989 — dimensioned to the 6m and 8m limits and prepared for Forest of Dean District Council's neighbour consultation.
Prior approval drawings for Blakeney — conservation area designated in 1979 — dimensioned to the 6m and 8m limits and prepared for Forest of Dean District Council's neighbour consultation.
Prior approval drawings for Brockweir — conservation area designated in 1989 — dimensioned to the 6m and 8m limits and prepared for Forest of Dean District Council's neighbour consultation.
Prior approval drawings for Dymock — conservation area designated in 1989 — dimensioned to the 6m and 8m limits and prepared for Forest of Dean District Council's neighbour consultation.
Prior approval drawings for English Bicknor — conservation area designated in 1995 — dimensioned to the 6m and 8m limits and prepared for Forest of Dean District Council's neighbour consultation.
Same extension, two routes, very different tests.
| Route | Depth allowed | What the council may consider | Timescale |
|---|---|---|---|
| Ordinary Class A permitted development | 3m attached / 4m detached | Nothing — no application needed | Immediate |
| Larger home extension prior approval | 6m attached / 8m detached | Amenity of adjoining premises, only if a neighbour objects | 21-day consultation, 42-day determination |
| Full householder application | No fixed limit | Design, materials, policy, amenity, everything | 8-week target |
| Any of these on designated land | 3m / 4m only | Prior approval scheme unavailable | Full application beyond the limits |
Limits and procedure from the GPDO 2015, Schedule 2, Part 1, Class A and paragraph A.4, made permanent by amendment in 2019.
A process built around the 21-day consultation, which is where these schemes are won or lost.
Send us your Forest of Dean postcode and house type. We confirm whether the property is on designated land, whether the scheme is available, and what depth you can realistically take.
We measure the original rear wall, eaves height, boundary distances and the neighbouring windows that the amenity assessment will turn on.
We draw the extension to the 6m or 8m limit with the boundary relationship shown in section, and prepare the written description and adjoining-owner details Forest of Dean District Council needs to start the consultation.
We submit, track the 21-day consultation and the 42-day determination, respond to any objection on amenity grounds, and revise free until the decision.
Three metres on a terraced or semi-detached house and four on a detached one under ordinary permitted development. Under the larger home extension prior approval scheme those double to six and eight metres, provided you notify Forest of Dean District Council before starting and the conditions on height, materials and land coverage are met. The scheme is not available on designated land.
It is a notification, not an application for permission. You tell Forest of Dean District Council what you intend to build, it writes to the adjoining owners, and they have 21 days to object. If nobody objects, you may build. If someone does, the council assesses the effect on the amenity of adjoining premises and must decide within 42 days. Design and policy are not in scope.
The council then considers the impact on the amenity of the adjoining property — loss of light, loss of outlook, and overbearing effect — and nothing else. It cannot refuse because it dislikes the design or the materials. We prepare the drawings so those three questions are already answered in section and on the site plan, which is what usually carries an objected scheme through. This applies to your Forest of Dean address specifically. Forest of Dean District Council is the decision-maker.
No. The larger home extension scheme is unavailable on designated land, which includes conservation areas such as Alvington Conservation Area and Awre Conservation Area, national landscapes, national parks and world heritage sites. On those properties the ordinary 3-metre and 4-metre limits apply, and anything deeper needs a full householder application to Forest of Dean District Council.
Twenty-one days for the neighbour consultation, and a maximum of 42 days from a valid submission for the council to determine it. If the council does not respond within 42 days you may proceed as notified. That deadline is the scheme's real advantage over a full application, and it is why validation completeness matters so much. This applies to your Forest of Dean address specifically. Forest of Dean District Council is the decision-maker.
Yes — always. Prior approval deals only with the planning position. A 6-metre rear extension still needs building control approval for foundations, structure, drainage, thermal performance and fire safety, and the beam over the opening into the existing house needs designing and calculating. We prepare both sets so the notified scheme is the buildable one. This applies to your Forest of Dean address specifically. Forest of Dean District Council is the decision-maker.
We quote each Forest of Dean scheme individually, because plot shape and the boundary relationship drive the work, and send a fixed, no-obligation quote within one working day. It covers the notification pack and free revisions until Forest of Dean District Council determines it. Call 020 7864 7245 to start.
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Same fixed quotes, same fast drawings — wherever your project is.