Side-return infill drawings for Old Town terraces — the glazed extension that fills the redundant side alley and opens up the kitchen, drawn to Swindon Borough Council's guidance, delivered in days and revised free until your decision, with a free approval-odds check first.
Swindon Borough Council granted 91% of the householder planning decisions it made in its latest published year — 4 points above the 87% England-wide householder average. Old Town contains Swindon Devizes Road, Swindon Town Gardens conservation areas (Swindon Devizes Road 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.
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 Swindon Devizes Road and Swindon Town Gardens those rights are removed, so we confirm your exact address before a line is drawn. A validated householder application in Old Town is determined against an 8-week statutory target.
Swindon Devizes Road (conservation area designated in 1990), Swindon Town Gardens (conservation area designated in 1989) and South Swindon (civil parish within Old Town) — these are the Old Town pockets our drawings cover most. Heritage designations here include Swindon Devizes Road and Swindon Town Gardens. Swindon Borough Council weighs each proposal against Swindon Borough Council's development plan and the design policies it applies to householder applications, where the 5,020 homes here are 21% 2000-2008, 12% pre-1900, 8% 1955-1964, which is what sets the realistic roof and rear-projection options. On roofs the borough is trussed-rafter roofs typical of 2000s building and steeply pitched slate roofs, valley gutters and party parapets typical of pre-1900 building, over 2000s houses and apartments (21% of 5,020 homes), Victorian and earlier houses (12%) and late-1950s and early-1960s houses (8%).
Before anything is drawn we check your address against the designations that apply in Old Town: Swindon Devizes Road (conservation area designated in 1990) and Swindon Town Gardens (conservation area designated in 1989). Inside those boundaries permitted development is curtailed and Swindon Borough 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, Old Town takes in South Swindon. No Article 4 direction is recorded for Swindon Borough Council, but Old Town's 2 conservation areas still limit permitted development on those streets.
On stock, Old Town is 2000s houses and apartments (21% of 5,020 homes), Victorian and earlier houses (12%) and late-1950s and early-1960s houses (8%) — which is why trussed-rafter roofs typical of 2000s building and steeply pitched slate roofs, valley gutters and party parapets typical of pre-1900 building govern what a loft or rear projection can realistically be. Swindon Borough Council decided 436 householder applications in the latest published year and granted 91%, with 92% issued inside the eight-week target. That decision record, not a national figure, is what we design to.
The full build-period split for Old Town runs pre-1900 12% (610 homes), 1900-1918 8% (380 homes), 1919-1929 2% (110 homes), 1930-1939 8% (390 homes), 1945-1954 1% (30 homes), 1955-1964 8% (400 homes), 1965-1972 2% (120 homes), 1973-1982 7% (350 homes), 1983-1992 6% (300 homes), 1993-1999 1% (40 homes) and 2000-2008 21% (1,070 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.
Swindon Borough Council also decides for Central, Chiseldon and Lawn, Eastcott, Mannington and Western, Ridgeway, Rodbourne Cheney, St Andrews and Blunsdon and Highworth, so a decision in Old Town 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.
Published figures for Old Town and Swindon Borough Council. These are the numbers that decide what is realistic on your street, so we work from them rather than from national averages.
| Measure | Old Town |
|---|---|
| Dwellings recorded | 5,020 |
| Built pre-1900 | 610 (12%) |
| Built 1900-1918 | 380 (8%) |
| Built 1919-1929 | 110 (2%) |
| Built 1930-1939 | 390 (8%) |
| Built 1945-1954 | 30 (1%) |
| Built 1955-1964 | 400 (8%) |
| Built 1965-1972 | 120 (2%) |
| Built 1973-1982 | 350 (7%) |
| Built 1983-1992 | 300 (6%) |
| Built 1993-1999 | 40 (1%) |
| Built 2000-2008 | 1,070 (21%) |
| Built before 1919 | 20% |
| Built 1919–1939 | 10% |
| Built 1945–2008 | 46% |
| Conservation areas in Old Town | 2 (Swindon Devizes Road, Swindon Town Gardens) |
| Conservation areas district-wide | 28 |
| Article 4 directions recorded | 0 |
| Householder applications decided | 436 |
| Householder applications granted | 91% |
| Decided within 8 weeks | 92% |
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 Swindon Borough Council's own, from MHCLG live table PS2 for the year to 31 March 2026.
The side return is the classic terrace fix, and Old Town has the stock for it — the borough is built largely from 2000s houses and apartments (21% of 5,020 homes), Victorian and earlier houses (12%) and late-1950s and early-1960s houses (8%), 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. Swindon Borough Council judges the infill against Swindon Borough Council's development plan and the design policies it applies to householder applications, 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. Old Town contains Swindon Devizes Road, Swindon Town Gardens conservation areas (Swindon Devizes Road designated 1990), so materials, fenestration and roof form are assessed against the appraisal, so we resolve it on the section rather than leave it to the case officer.
Many of Old Town's terraces sit in conservation areas — Swindon Devizes Road and Swindon Town Gardens among them — where a side extension is no longer permitted development. No Article 4 direction is recorded for Swindon Borough Council, but Old Town's 2 conservation areas still limit permitted development on those streets. We confirm the designation before a line is drawn.
Some single-storey side returns in Old Town 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 Swindon Borough 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 Swindon Borough 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 Swindon Borough Council's real householder decision record, drawn from official planning statistics and refreshed as new data lands. Swindon Borough Council granted 91% of its householder applications in the year to 31 March 2026, and Swindon Devizes Road shapes what is approved here. 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 Swindon Devizes Road, Swindon Town Gardens and South Swindon, 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 2000s houses and apartments (21% of 5,020 homes), 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.
The 5,020 homes here are 21% 2000-2008, 12% pre-1900, 8% 1955-1964, which is what sets the realistic roof and rear-projection options. 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 Swindon Borough 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 Old Town side returns come up most often:
Side return extension drawings for Swindon Devizes Road's conservation area designated in 1990 — width-checked, party-wall detailed and drawn to Swindon Borough Council's guidance.
Side return extension drawings for Swindon Town Gardens's conservation area designated in 1989 — width-checked, party-wall detailed and drawn to Swindon Borough Council's guidance.
Side return extension drawings for South Swindon's civil parish within Old Town — width-checked, party-wall detailed and drawn to Swindon Borough Council's guidance.
Whether a side return in Old Town 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 Swindon Borough 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 Swindon Devizes Road and Swindon Town Gardens, side extensions are not permitted development and always need a full application.
A fixed process built around how Swindon Borough Council validates and decides side-return applications — most drawings are submission-ready within seven days of survey.
Send us your Old Town 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 Swindon Borough 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 Swindon Borough 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 Swindon Borough 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 Old Town you will need a full application to Swindon Borough Council for anything wider or taller, for a two-storey side return, and for any side extension in a conservation area such as Swindon Devizes Road and Swindon Town Gardens, 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. Old Town's period terraces are ideally suited to it, which is why the side return is one of the borough's most common extensions. Swindon Borough 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 Swindon Borough 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 Old Town 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 Swindon Borough 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 Old Town address specifically.
A householder planning application in Old Town 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. Swindon Borough Council is the decision-maker.
We price each Old Town 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 Swindon Borough 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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