Side-return infill drawings for Stonehouse terraces — the glazed extension that fills the redundant side alley and opens up the kitchen, drawn to Plymouth City Council's guidance, delivered in days and revised free until your decision, with a free approval-odds check first.
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. Stonehouse's naval and victualling heritage — Durnford Street, Emma Place and the Grade I Royal William Yard — puts fine-grain military architecture at the centre of most heritage assessments, 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.
Before permission is required, Class B allows 40m³ of added loft volume on a terrace and 50m³ on a semi or detached house, and Class A allows a 3m single-storey rear extension on a terrace or 4m on a detached house. Stonehouse carries at least one Article 4 direction, and conservation areas including Stonehouse Peninsula, North Stonehouse and Millfields remove those rights outright, so we confirm your exact address before a line is drawn. A validated householder application in Stonehouse is determined against an 8-week statutory target.
Durnford Street (long Georgian naval terrace running down the peninsula to the Royal William Yard), Emma Place (Regency set-piece terrace merged into the Stonehouse Peninsula conservation area in 2006), Wyndham Square (the North Stonehouse conservation area's church-centred Georgian square), Millfields (the former Royal Naval Hospital grounds, now gated period housing), Adelaide Street (close-grained early-Victorian terraces off Union Street) and Royal William Yard (Sir John Rennie's listed Grade I Victualling Yard buildings, converted to flats) — these are the Stonehouse pockets our drawings cover most. Heritage designations here include Stonehouse Peninsula, North Stonehouse, Millfields, Adelaide Street & Clarence Place and Union Street. Plymouth City Council weighs each proposal against the Plymouth and South West Devon Joint Local Plan (2019), where much of the Georgian stock was war-damaged and patched with post-war infill, so officers weigh a scheme against whatever original terrace rhythm survives on the street. Large parts of Stonehouse are already converted flats, maisonettes and HMOs, which hold no householder permitted-development rights of their own.. On roofs the borough is parapet-hidden valley and butterfly roofs behind the Georgian terraces and pitched and hipped slate roofs on the Victorian streets, over Georgian and Regency terraces around Durnford Street and Emma Place, converted flats, maisonettes and HMOs and Victorian terraces and post-war infill on the wartime-cleared plots.
The side return is the classic terrace fix, and Stonehouse has the stock for it — the borough is built largely from Georgian and Regency terraces around Durnford Street and Emma Place, converted flats, maisonettes and HMOs and Victorian terraces and post-war infill on the wartime-cleared plots, and the Victorian and Edwardian versions almost all have an L-shaped back addition with a wasted alley beside it. Fill that alley and the dark galley kitchen becomes a bright, square room the full width of the house. Plymouth City Council judges the infill against the Plymouth and South West Devon Joint Local Plan (2019), and because it runs along the party boundary, the neighbour relationship is read before the design.
That boundary is where the drawings earn their keep. We set the infill wall on or up to the line, keep the roof — usually a glazed lantern or a shallow pitch tying into the existing back-addition slope — below the neighbour's first-floor windows, and detail the rainwater and party-wall junction so the build is watertight and the Party Wall Act is satisfied. Stonehouse's naval and victualling heritage — Durnford Street, Emma Place and the Grade I Royal William Yard — puts fine-grain military architecture at the centre of most heritage assessments, so we resolve it on the section rather than leave it to the case officer.
Many of Stonehouse's terraces sit in conservation areas — Stonehouse Peninsula, North Stonehouse, Millfields, Adelaide Street & Clarence Place and Union Street among them — where a side extension is no longer permitted development. The northern edge of Stonehouse falls within Plymouth's city-wide HMO Article 4 direction, in force since 14 September 2012, which removed the permitted-development right to turn a family house into a small (C4) house in multiple occupation, so shared-house conversions here need a planning application. We confirm the designation before a line is drawn.
Some single-storey side returns in Stonehouse are permitted development, but the width and boundary make an application more likely than for a straight rear extension. You will normally need to apply to Plymouth City Council if any of these apply:
We draw the infill wall on the boundary, the glazed roof below the neighbour's windows and the party-wall junction on the page — the details Plymouth City Council's officers and your neighbour both check — and submit a validation-complete pack, whether that is a lawful development certificate or a full householder application.
Below is Plymouth City Council's real householder decision record, drawn from official planning statistics and refreshed as new data lands. Plymouth grants the large majority of householder applications, but in Stonehouse the density of Georgian terraces, the Royal William Yard's Grade I listing and the HMO Article 4 controls make heritage and shared-housing policy the usual deciding issues. Side returns hinge on width, roof glazing and the party boundary, so a pack that resolves those details upfront is decided faster and refused less often than a DIY submission.
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 Durnford Street, Emma Place and Wyndham Square, the approved side return is a single-storey infill roofed with a glazed lantern or roof light to pull daylight deep into the plan, its flank wall built on the boundary and finished to match the host brick. On the borough's georgian and regency terraces around durnford street and emma place, this is frequently the single biggest gain in usable ground-floor space, and where it stays within the width and height limits it can proceed under permitted development or a lawful development certificate.
Much of the Georgian stock was war-damaged and patched with post-war infill, so officers weigh a scheme against whatever original terrace rhythm survives on the street. We keep the glazed roof below the neighbour's cill line, set the gutter and the party-wall flashing so water and maintenance are designed in, and — where owners want the full open-plan room — pair the infill with a rear extension as a single wraparound application. That way Plymouth City Council sees one coherent scheme rather than two overlapping ones.
We draw side-return infills on every terraced street in the borough. A few of the neighbourhoods where Stonehouse side returns come up most often:
Side return extension drawings for Durnford Street's long Georgian naval terrace running down the peninsula to the Royal William Yard — width-checked, party-wall detailed and drawn to Plymouth City Council's guidance.
Side return extension drawings for Emma Place's Regency set-piece terrace merged into the Stonehouse Peninsula conservation area in 2006 — width-checked, party-wall detailed and drawn to Plymouth City Council's guidance.
Side return extension drawings for Wyndham Square's the North Stonehouse conservation area's church-centred Georgian square — width-checked, party-wall detailed and drawn to Plymouth City Council's guidance.
Side return extension drawings for Millfields's the former Royal Naval Hospital grounds, now gated period housing — width-checked, party-wall detailed and drawn to Plymouth City Council's guidance.
Side return extension drawings for Adelaide Street's close-grained early-Victorian terraces off Union Street — width-checked, party-wall detailed and drawn to Plymouth City Council's guidance.
Side return extension drawings for Royal William Yard's Sir John Rennie's listed Grade I Victualling Yard buildings, converted to flats — width-checked, party-wall detailed and drawn to Plymouth City Council's guidance.
Whether a side return in Stonehouse needs permission comes down to width, storeys and whether the street is designated. This is how the cases compare.
| Side return type | Permitted development? | What it gains | What Plymouth City Council checks |
|---|---|---|---|
| Single-storey infill, within limits | Often yes, if under half the house width | Full-width kitchen-diner | Width, 4m height, roof glazing |
| Single-storey, over half width | No — full application | Wider room, more light | Boundary treatment, neighbour amenity |
| Two-storey side return | No — full application | Room above as well as below | Bulk, overlooking, terrace rhythm |
| Wraparound (side + rear) | No — full application | L-shaped open-plan ground floor | Combined footprint, garden retained |
In conservation areas such as Stonehouse Peninsula and North Stonehouse, side extensions are not permitted development and always need a full application.
A fixed process built around how Plymouth City Council validates and decides side-return applications — most drawings are submission-ready within seven days of survey.
Send us your Stonehouse postcode and terrace type. We confirm your conservation and Article 4 status, whether the infill stays within the side-extension width limit, and score your odds against live Plymouth City Council decisions.
We measure the side alley, the back-addition wall, floor and eaves levels and the neighbour's window heights — the numbers the width limit, roof pitch and party-wall detailing depend on.
Chartered designers develop the infill and its glazed roof to your brief, drawn inside the permitted-development limits or to Plymouth City Council's extension guidance, with the boundary and party-wall junction detailed.
We submit the certificate or application, manage validation and case-officer queries, and revise the drawings free until Plymouth City Council issues its decision.
Sometimes not. A single-storey side-return infill can be permitted development if it is no wider than half the original house, no higher than 4 metres, and the property is not on designated land. In Stonehouse you will need a full application to Plymouth City Council for anything wider or taller, for a two-storey side return, and for any side extension in a conservation area such as Stonehouse Peninsula and North Stonehouse, where those rights are removed.
It is an infill that fills the narrow open alley running alongside the rear back-addition of a Victorian or Edwardian terrace — the strip of ground that is usually too small to use. Building over it squares off the ground floor, so a cramped galley kitchen becomes a full-width room. Stonehouse's period terraces are ideally suited to it, which is why the side return is one of the borough's most common extensions. Plymouth City Council is the decision-maker.
Almost always. A side return is built on or up to the boundary with your neighbour, so the Party Wall etc. Act applies and you must serve notice before work starts — this is entirely separate from Plymouth City Council's planning decision. We detail the party-wall junction on the drawings and flag the notice early so a surveyor can be appointed without delaying the build. This applies to your Stonehouse address specifically.
Yes, and it is common — the combined L-shape is a wraparound extension. Once the side infill joins a rear projection beyond the permitted-development depth, the whole thing needs a full householder application to Plymouth City Council rather than qualifying as permitted development. We draw it as one coherent scheme so the council assesses a single footprint, which reads more clearly than two overlapping proposals. This applies to your Stonehouse address specifically.
A householder planning application in Stonehouse runs to a statutory eight-week target, and a lawful development certificate to eight weeks as well, though an incomplete pack can stall at validation. Because a side return involves the boundary and roof glazing, a complete, well-detailed submission matters — we prepare it validation-complete and manage officer queries to keep the decision on track. Plymouth City Council is the decision-maker.
We price each Stonehouse side return individually, because alley width and roof form vary house to house, and send a fixed, no-obligation quote within one working day. It covers the full drawing pack with free revisions until Plymouth City Council approves, and we confirm at the outset whether your infill is permitted development or needs an application. Call 020 7864 7245 to start.
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