The fast route to a deep single-storey rear extension in Devonport — up to 6 metres on an attached house or 8 on a detached one — via Plymouth City Council's prior approval scheme rather than a full planning application.
Plymouth City Council granted 93% of the householder planning decisions it made in its latest published year — 6 points above the 87% England-wide householder average. Devonport grew as the Royal Navy's dockyard town, and Foulston's Ker Street civic buildings anchor a heritage assessment on any nearby scheme, which is where a policy-literate drawing pack earns its keep. Its dominant Georgian (1714–1837), Victorian (1837–1901) and postwar (1945–1970) housing stock sets the design brief on most streets.
The permitted-development ceilings are fixed: 40m³ of new roof volume for a terraced loft and 50m³ for a semi or detached house under Class B, plus a 3m single-storey rear extension on a terrace or 4m on a detached house under Class A. In conservation areas such as Devonport and Stoke those rights are removed, so we confirm your exact address before a line is drawn. A validated householder application in Devonport is determined against an 8-week statutory target.
Ker Street (John Foulston's Georgian civic set-piece, with its Egyptian House and Doric column), Mount Wise (elevated former naval quarters overlooking the Hamoaze), Morice Town (dense terraced streets serving the dockyard workforce), Stoke Damerel (the historic parish core on the rising ground toward Stoke), Devonport Park (Victorian villas and terraces around the People's Park) and Mutton Cove (the old landing point below Mount Wise) — these are the Devonport pockets our drawings cover most. Heritage designations here include Devonport and Stoke. Plymouth City Council weighs each proposal against the Plymouth and South West Devon Joint Local Plan (2019), where the district was among the most heavily bombed in the country and was largely rebuilt, so post-war and regeneration-era housing sits alongside the surviving Georgian fabric and both are read together. Parts of Morice Town and the regeneration areas include flats and maisonettes that sit outside householder permitted-development rights.. On roofs the borough is parapet and pitched roofs on the Georgian terraces and pitched and hipped roofs on the Victorian and post-war housing, over Georgian dockyard terraces around Ker Street and Mount Wise, post-war and regeneration-era housing on the war-cleared plots and Victorian terraces on the higher ground toward Stoke.
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 Devonport and Stoke 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.
Devonport is largely Georgian dockyard terraces around Ker Street and Mount Wise, post-war and regeneration-era housing on the war-cleared plots and Victorian terraces on the higher ground toward Stoke. Devonport grew as the Royal Navy's dockyard town, and Foulston's Ker Street civic buildings anchor a heritage assessment on any nearby scheme, which matters here because an objecting neighbour puts amenity squarely in front of a case officer. Devonport lies outside the city's HMO Article 4 area, which is focused on Mutley, Greenbank and the city centre, so a small house-in-multiple-occupation conversion can still fall under permitted development here — but works in the Devonport and neighbouring Stoke conservation areas need consent.
The scheme is available where all of these hold. Fail any one and it is a full application to Plymouth City Council instead:
We prepare the notification pack Plymouth City 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 Plymouth City Council's real householder decision record, drawn from official planning statistics and refreshed as new data lands. Plymouth approves a high share of householder applications in Devonport, where the naval-dockyard heritage around Ker Street and Mount Wise, rather than density, is what most often shapes the design conditions attached to a consent. 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.
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Across Ker Street, Mount Wise and Morice Town, 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 district was among the most heavily bombed in the country and was largely rebuilt, so post-war and regeneration-era housing sits alongside the surviving Georgian fabric and both are read together. 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 Devonport. A few of the areas where deep rear extensions come up most often:
Prior approval drawings for Ker Street — John Foulston's Georgian civic set-piece, with its Egyptian House and Doric column — dimensioned to the 6m and 8m limits and prepared for Plymouth City Council's neighbour consultation.
Prior approval drawings for Mount Wise — elevated former naval quarters overlooking the Hamoaze — dimensioned to the 6m and 8m limits and prepared for Plymouth City Council's neighbour consultation.
Prior approval drawings for Morice Town — dense terraced streets serving the dockyard workforce — dimensioned to the 6m and 8m limits and prepared for Plymouth City Council's neighbour consultation.
Prior approval drawings for Stoke Damerel — the historic parish core on the rising ground toward Stoke — dimensioned to the 6m and 8m limits and prepared for Plymouth City Council's neighbour consultation.
Prior approval drawings for Devonport Park — Victorian villas and terraces around the People's Park — dimensioned to the 6m and 8m limits and prepared for Plymouth City Council's neighbour consultation.
Prior approval drawings for Mutton Cove — the old landing point below Mount Wise — dimensioned to the 6m and 8m limits and prepared for Plymouth City 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 Devonport 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 Plymouth City 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 Plymouth City Council before starting and the conditions on height, materials and land coverage are met. The scheme is not available on designated land. This applies to your Devonport address specifically.
It is a notification, not an application for permission. You tell Plymouth City 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. This applies to your Devonport address specifically.
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 Devonport address specifically. Plymouth City Council is the decision-maker.
No. The larger home extension scheme is unavailable on designated land, which includes conservation areas such as Devonport and Stoke, 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 Plymouth City 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 Devonport address specifically. Plymouth City 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 Devonport address specifically. Plymouth City Council is the decision-maker.
We quote each Devonport 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 Plymouth City Council determines it. Call 020 7864 7245 to start.
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