The fast route to a deep single-storey rear extension in Mutley — 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. Mutley and Greenbank are the heart of the HMO Article 4 area, so any conversion to shared student housing is a planning decision, not an automatic right, which is where a policy-literate drawing pack earns its keep. Its dominant Victorian (1837–1901) and Edwardian (1901–1910) 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. Mutley carries at least one Article 4 direction, and conservation areas including Mannamead and North Stonehouse remove those rights outright, so we confirm your exact address before a line is drawn. A validated householder application in Mutley is determined against an 8-week statutory target.
Mutley Plain (the busy Victorian shopping street ringed by converted terraces), Greenbank (dense Victorian terraces beside the university, dominated by HMOs), Ford Park (Victorian terraces around the cemetery and Ford Park Road), North Road East (period terraces on the slope up from the station), Napier Terrace (close-grained Victorian terraces off Mutley Plain) and Lipson fringe (terraced streets shading east toward Lipson) — these are the Mutley pockets our drawings cover most. Heritage designations here include Mannamead and North Stonehouse. Plymouth City Council weighs each proposal against the Plymouth and South West Devon Joint Local Plan (2019), where the council uses the direction to resist further loss of family homes and to rebalance streets already dominated by houses in multiple occupation. Much of Mutley and Greenbank is already flats, bedsits and shared houses, none of which carry householder permitted-development rights of their own.. On roofs the borough is pitched and gabled slate roofs on the Victorian terraces and hipped roofs on the Edwardian villas, over Victorian terraces heavily converted to student HMOs, Edwardian terraces and villas toward Mannamead and converted flats and bedsits around Mutley Plain.
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 Mannamead and North Stonehouse 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.
Mutley is largely Victorian terraces heavily converted to student HMOs, Edwardian terraces and villas toward Mannamead and converted flats and bedsits around Mutley Plain. Mutley and Greenbank are the heart of the HMO Article 4 area, so any conversion to shared student housing is a planning decision, not an automatic right, which matters here because an objecting neighbour puts amenity squarely in front of a case officer. Mutley is at the core of Plymouth's HMO Article 4 direction, in force since 14 September 2012, which removed the permitted-development right to convert a family house (use class C3) into a small house in multiple occupation (C4) across Mutley, Greenbank and the city centre — the council introduced it to curb the studentification driven by the nearby University of Plymouth.
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 grants most straightforward householder work in Mutley, but as the centre of the HMO Article 4 area, applications that add or intensify shared student housing face the district's tightest scrutiny. 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 Mutley Plain, Greenbank and Ford Park, 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 council uses the direction to resist further loss of family homes and to rebalance streets already dominated by houses in multiple occupation. 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 Mutley. A few of the areas where deep rear extensions come up most often:
Prior approval drawings for Mutley Plain — the busy Victorian shopping street ringed by converted terraces — dimensioned to the 6m and 8m limits and prepared for Plymouth City Council's neighbour consultation.
Prior approval drawings for Greenbank — dense Victorian terraces beside the university, dominated by HMOs — dimensioned to the 6m and 8m limits and prepared for Plymouth City Council's neighbour consultation.
Prior approval drawings for Ford Park — Victorian terraces around the cemetery and Ford Park Road — dimensioned to the 6m and 8m limits and prepared for Plymouth City Council's neighbour consultation.
Prior approval drawings for North Road East — period terraces on the slope up from the station — dimensioned to the 6m and 8m limits and prepared for Plymouth City Council's neighbour consultation.
Prior approval drawings for Napier Terrace — close-grained Victorian terraces off Mutley Plain — dimensioned to the 6m and 8m limits and prepared for Plymouth City Council's neighbour consultation.
Prior approval drawings for Lipson fringe — terraced streets shading east toward Lipson — 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 Mutley 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 Mutley 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 Mutley 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 Mutley 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 Mannamead and North Stonehouse, 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. This applies to your Mutley address specifically.
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 Mutley 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 Mutley address specifically. Plymouth City Council is the decision-maker.
We quote each Mutley 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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Same fixed quotes, same fast drawings — wherever your project is.