Side-return infill drawings for Mayfield & Five Ashes terraces — the glazed extension that fills the redundant side alley and opens up the kitchen, drawn to Wealden District Council's guidance, delivered in days and revised free until your decision, with a free approval-odds check first.
Wealden District Council granted 88% of the householder planning decisions it made in its latest published year — 1 point above the 87% England-wide householder average. Mayfield & Five Ashes contains Five Ashes Conservation Area, Mayfield and Coggins Mill Conservation Area conservation areas (Five Ashes Conservation Area designated 2017), 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), interwar (1918–1939) 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. In conservation areas such as Five Ashes Conservation Area and Mayfield and Coggins Mill Conservation Area those rights are removed, so we confirm your exact address before a line is drawn. A validated householder application in Mayfield & Five Ashes is determined against an 8-week statutory target.
Five Ashes (conservation area designated in 2017), Mayfield and Coggins Mill (conservation area designated in 2017) and Mayfield and Five Ashes (civil parish within Mayfield & Five Ashes) — these are the Mayfield & Five Ashes pockets our drawings cover most. Heritage designations here include Five Ashes Conservation Area and Mayfield and Coggins Mill Conservation Area. Wealden District Council weighs each proposal against Wealden District Council's development plan and the design policies it applies to householder applications, where the 1,910 homes here are 34% pre-1900, 9% 1930-1939, 8% 1945-1954, which is what sets the realistic roof and rear-projection options. On roofs the borough is steeply pitched slate roofs, valley gutters and party parapets typical of pre-1900 building and hipped roofs with shallow pitches typical of 1930s building, over Victorian and earlier houses (34% of 1,910 homes), 1930s semi-detached and detached houses (9%) and early postwar houses (8%).
What is permitted in Mayfield & Five Ashes turns on designation first, so that is where we start: Five Ashes (conservation area designated in 2017) and Mayfield and Coggins Mill (conservation area designated in 2017). Inside those boundaries permitted development is curtailed and Wealden District 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, Mayfield & Five Ashes takes in Mayfield and Five Ashes. No Article 4 direction is recorded for Wealden District Council, but Mayfield & Five Ashes's 2 conservation areas still limit permitted development on those streets.
On stock, Mayfield & Five Ashes is Victorian and earlier houses (34% of 1,910 homes), 1930s semi-detached and detached houses (9%) and early postwar houses (8%) — which is why steeply pitched slate roofs, valley gutters and party parapets typical of pre-1900 building and hipped roofs with shallow pitches typical of 1930s building govern what a loft or rear projection can realistically be. Wealden District Council decided 721 householder applications in the latest published year and granted 88%, with 69% issued inside the eight-week target. We draw to that record rather than to a national average.
The full build-period split for Mayfield & Five Ashes runs pre-1900 34% (650 homes), 1900-1918 4% (70 homes), 1919-1929 6% (120 homes), 1930-1939 9% (180 homes), 1945-1954 8% (150 homes), 1955-1964 6% (120 homes), 1965-1972 4% (80 homes), 1973-1982 4% (70 homes), 1983-1992 5% (90 homes), 1993-1999 3% (50 homes) and 2000-2008 3% (50 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.
Wealden District Council also decides for Arlington, Crowborough North, Danehill & Fletching, Frant & Wadhurst, Hailsham Central, Hartfield, Hellingly and Horam & Punnetts Town, so a decision in Mayfield & Five Ashes 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 Mayfield & Five Ashes and Wealden District Council. These are the numbers that decide what is realistic on your street, so we work from them rather than from national averages.
| Measure | Mayfield & Five Ashes |
|---|---|
| Dwellings recorded | 1,910 |
| Built pre-1900 | 650 (34%) |
| Built 1900-1918 | 70 (4%) |
| Built 1919-1929 | 120 (6%) |
| Built 1930-1939 | 180 (9%) |
| Built 1945-1954 | 150 (8%) |
| Built 1955-1964 | 120 (6%) |
| Built 1965-1972 | 80 (4%) |
| Built 1973-1982 | 70 (4%) |
| Built 1983-1992 | 90 (5%) |
| Built 1993-1999 | 50 (3%) |
| Built 2000-2008 | 50 (3%) |
| Built before 1919 | 38% |
| Built 1919–1939 | 16% |
| Built 1945–2008 | 32% |
| Conservation areas in Mayfield & Five Ashes | 2 (Five Ashes Conservation Area, Mayfield and Coggins Mill Conservation Area) |
| Conservation areas district-wide | 33 |
| Article 4 directions recorded | 0 |
| Householder applications decided | 721 |
| Householder applications granted | 88% |
| Decided within 8 weeks | 69% |
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 Wealden District Council's own, from MHCLG live table PS2 for the year to 31 March 2026.
The side return is the classic terrace fix, and Mayfield & Five Ashes has the stock for it — the borough is built largely from Victorian and earlier houses (34% of 1,910 homes), 1930s semi-detached and detached houses (9%) and early postwar 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. Wealden District Council judges the infill against Wealden District 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. Mayfield & Five Ashes contains Five Ashes Conservation Area, Mayfield and Coggins Mill Conservation Area conservation areas (Five Ashes Conservation Area designated 2017), 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 Mayfield & Five Ashes's terraces sit in conservation areas — Five Ashes Conservation Area and Mayfield and Coggins Mill Conservation Area among them — where a side extension is no longer permitted development. No Article 4 direction is recorded for Wealden District Council, but Mayfield & Five Ashes'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 Mayfield & Five Ashes 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 Wealden District 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 Wealden District 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 Wealden District Council's real householder decision record, drawn from official planning statistics and refreshed as new data lands. Wealden District Council granted 88% of its householder applications in the year to 31 March 2026, and Five Ashes Conservation Area 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 Five Ashes, Mayfield and Coggins Mill and Mayfield and Five Ashes, 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 victorian and earlier houses (34% of 1,910 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 1,910 homes here are 34% pre-1900, 9% 1930-1939, 8% 1945-1954, 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 Wealden District 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 Mayfield & Five Ashes side returns come up most often:
Side return extension drawings for Five Ashes's conservation area designated in 2017 — width-checked, party-wall detailed and drawn to Wealden District Council's guidance.
Side return extension drawings for Mayfield and Coggins Mill's conservation area designated in 2017 — width-checked, party-wall detailed and drawn to Wealden District Council's guidance.
Side return extension drawings for Mayfield and Five Ashes's civil parish within Mayfield & Five Ashes — width-checked, party-wall detailed and drawn to Wealden District Council's guidance.
Whether a side return in Mayfield & Five Ashes 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 Wealden District 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 Five Ashes Conservation Area and Mayfield and Coggins Mill Conservation Area, side extensions are not permitted development and always need a full application.
A fixed process built around how Wealden District Council validates and decides side-return applications — most drawings are submission-ready within seven days of survey.
Send us your Mayfield & Five Ashes 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 Wealden District 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 Wealden District 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 Wealden District 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 Mayfield & Five Ashes you will need a full application to Wealden District Council for anything wider or taller, for a two-storey side return, and for any side extension in a conservation area such as Five Ashes Conservation Area and Mayfield and Coggins Mill Conservation Area, 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. Mayfield & Five Ashes's period terraces are ideally suited to it, which is why the side return is one of the borough's most common extensions. Wealden District 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 Wealden District 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 Mayfield & Five Ashes 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 Wealden District 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 Mayfield & Five Ashes address specifically.
A householder planning application in Mayfield & Five Ashes 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. Wealden District Council is the decision-maker.
We price each Mayfield & Five Ashes 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 Wealden District 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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