The fast route to a deep single-storey rear extension in St Clements — up to 6 metres on an attached house or 8 on a detached one — via Oxford City Council's prior approval scheme rather than a full planning application.
Oxford City Council granted 87% of the householder planning decisions it made in its latest published year — level with the 87% England-wide householder average. The St Clement's and Iffley Road conservation area protects a Victorian and Georgian roofscape and mature tree planting at a key eastern gateway into Oxford, which is where a policy-literate drawing pack earns its keep. Its dominant Georgian (1714–1837), Victorian (1837–1901) and Edwardian (1901–1910) 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. St Clements carries at least one Article 4 direction, and conservation areas including St Clement's and Iffley Road and Central (City and University) remove those rights outright, so we confirm your exact address before a line is drawn. A validated householder application in St Clements is determined against an 8-week statutory target.
St Clement's Street (an extra-mural suburb strung along the old London road east of Magdalen Bridge, with buildings such as the 17th-century Old Black Horse), Cowley Road (Victorian terraces behind a cosmopolitan shopping street), East Oxford (the grid of late-Victorian working-class terraces between the Cowley and Iffley Roads), St John the Evangelist (streets set back around Bodley's 1896 church), The Plain (the busy junction where St Clement's meets Magdalen Bridge) and Divinity Road (Edwardian terraces climbing the slope above the Cowley Road) — these are the St Clements pockets our drawings cover most. Heritage designations here include St Clement's and Iffley Road and Central (City and University). Oxford City Council weighs each proposal against the Oxford Local Plan 2036, where plots along the historic frontages are tight and irregular, so rear and roof additions are tested hard on daylight and the historic grain. East Oxford and St Clement's terraces are extensively converted into flats and student houses, which hold no householder permitted-development rights.. On roofs the borough is steep older roofs on the historic frontages and gabled and hipped roofs on the Victorian terraces, over post-Civil-War and Georgian houses along the historic London road, Victorian working-class terraces of East Oxford and converted period flats and student lets.
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 St Clement's and Iffley Road and Central (City and University) 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.
St Clements is largely post-Civil-War and Georgian houses along the historic London road, Victorian working-class terraces of East Oxford and converted period flats and student lets. The St Clement's and Iffley Road conservation area protects a Victorian and Georgian roofscape and mature tree planting at a key eastern gateway into Oxford, which matters here because an objecting neighbour puts amenity squarely in front of a case officer. Oxford operates a city-wide Article 4 direction (in force since 25 February 2012) that removes the permitted right to change a family home into a small C4 house in multiple occupation, so an HMO conversion anywhere in the city needs planning permission — and the conservation areas layer further controls on frontages, roofs and windows on top.
The scheme is available where all of these hold. Fail any one and it is a full application to Oxford City Council instead:
We prepare the notification pack Oxford 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 Oxford City Council's real householder decision record, drawn from official planning statistics and refreshed as new data lands. Oxford grants around 87% of the applications it decides, and in St Clements the historic gateway conservation area and the density of student rental demand under the HMO Article 4 are the defining constraints. 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 St Clement's Street, Cowley Road and East Oxford, 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.
Plots along the historic frontages are tight and irregular, so rear and roof additions are tested hard on daylight and the historic grain. 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 St Clements. A few of the areas where deep rear extensions come up most often:
Prior approval drawings for St Clement's Street — an extra-mural suburb strung along the old London road east of Magdalen Bridge, with buildings such as the 17th-century Old Black Horse — dimensioned to the 6m and 8m limits and prepared for Oxford City Council's neighbour consultation.
Prior approval drawings for Cowley Road — Victorian terraces behind a cosmopolitan shopping street — dimensioned to the 6m and 8m limits and prepared for Oxford City Council's neighbour consultation.
Prior approval drawings for East Oxford — the grid of late-Victorian working-class terraces between the Cowley and Iffley Roads — dimensioned to the 6m and 8m limits and prepared for Oxford City Council's neighbour consultation.
Prior approval drawings for St John the Evangelist — streets set back around Bodley's 1896 church — dimensioned to the 6m and 8m limits and prepared for Oxford City Council's neighbour consultation.
Prior approval drawings for The Plain — the busy junction where St Clement's meets Magdalen Bridge — dimensioned to the 6m and 8m limits and prepared for Oxford City Council's neighbour consultation.
Prior approval drawings for Divinity Road — Edwardian terraces climbing the slope above the Cowley Road — dimensioned to the 6m and 8m limits and prepared for Oxford 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 St Clements 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 Oxford 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 Oxford 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 St Clements address specifically.
It is a notification, not an application for permission. You tell Oxford 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 St Clements 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 St Clements address specifically. Oxford City Council is the decision-maker.
No. The larger home extension scheme is unavailable on designated land, which includes conservation areas such as St Clement's and Iffley Road and Central (City and University), 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 Oxford City Council. This applies to your St Clements 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 St Clements address specifically. Oxford 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 St Clements address specifically. Oxford City Council is the decision-maker.
We quote each St Clements 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 Oxford City Council determines it. Call 020 7864 7245 to start.
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Same fixed quotes, same fast drawings — wherever your project is.