Side-return infill drawings for Ashbourne South terraces — the glazed extension that fills the redundant side alley and opens up the kitchen, drawn to Derbyshire Dales District Council's guidance, delivered in days and revised free until your decision, with a free approval-odds check first.
Derbyshire Dales District Council granted 93% of the householder planning decisions it made in its latest published year — 6 points above the 87% England-wide householder average. Ashbourne South contains the Osmaston conservation area (Osmaston designated 1972), 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) 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 Osmaston those rights are removed, so we confirm your exact address before a line is drawn. A validated householder application in Ashbourne South is determined against an 8-week statutory target.
Osmaston (conservation area designated in 1972), Clifton and Compton (civil parish within Ashbourne South), Edlaston and Wyaston (civil parish within Ashbourne South), Osmaston (civil parish within Ashbourne South), Yeldersley (civil parish within Ashbourne South) and Ashbourne (civil parish within Ashbourne South) — these are the Ashbourne South pockets our drawings cover most. Heritage designations here include Osmaston. Derbyshire Dales District Council weighs each proposal against the adopted Derbyshire Dales local plan and Derbyshire Dales District Council's design guidance for householder work, where the 3,750 homes here are 21% pre-1900, 11% 1973-1982, 11% 2000-2008, 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 shallow trussed roofs typical of 1970s building, over Victorian and earlier houses (21% of 3,750 homes), 1970s and early-1980s houses (11%) and 2000s houses and apartments (11%).
What is permitted in Ashbourne South turns on designation first, so that is where we start: Osmaston (conservation area designated in 1972). Inside those boundaries permitted development is curtailed and Derbyshire Dales 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, Ashbourne South takes in Clifton and Compton, Edlaston and Wyaston, Osmaston, Yeldersley and Ashbourne. No Article 4 direction is recorded for Derbyshire Dales District Council, but Ashbourne South's 1 conservation area still limit permitted development on those streets.
On stock, Ashbourne South is Victorian and earlier houses (21% of 3,750 homes), 1970s and early-1980s houses (11%) and 2000s houses and apartments (11%) — which is why steeply pitched slate roofs, valley gutters and party parapets typical of pre-1900 building and shallow trussed roofs typical of 1970s building govern what a loft or rear projection can realistically be. Derbyshire Dales District Council decided 189 householder applications in the latest published year and granted 93%, with 70% issued inside the eight-week target. We draw to that record rather than to a national average.
The full build-period split for Ashbourne South runs pre-1900 21% (780 homes), 1900-1918 2% (90 homes), 1919-1929 5% (170 homes), 1930-1939 3% (110 homes), 1945-1954 2% (70 homes), 1955-1964 3% (100 homes), 1965-1972 5% (190 homes), 1973-1982 11% (420 homes), 1983-1992 4% (150 homes), 1993-1999 10% (360 homes) and 2000-2008 11% (420 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.
Derbyshire Dales District Council also decides for Ashbourne North, Brailsford, Doveridge & Sudbury, Hulland, Matlock East & Tansley, Matlock West, Norbury and Wirksworth, so a decision in Ashbourne South 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 Ashbourne South and Derbyshire Dales 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 | Ashbourne South |
|---|---|
| Dwellings recorded | 3,750 |
| Built pre-1900 | 780 (21%) |
| Built 1900-1918 | 90 (2%) |
| Built 1919-1929 | 170 (5%) |
| Built 1930-1939 | 110 (3%) |
| Built 1945-1954 | 70 (2%) |
| Built 1955-1964 | 100 (3%) |
| Built 1965-1972 | 190 (5%) |
| Built 1973-1982 | 420 (11%) |
| Built 1983-1992 | 150 (4%) |
| Built 1993-1999 | 360 (10%) |
| Built 2000-2008 | 420 (11%) |
| Built before 1919 | 23% |
| Built 1919–1939 | 7% |
| Built 1945–2008 | 46% |
| Conservation areas in Ashbourne South | 1 (Osmaston) |
| Conservation areas district-wide | 31 |
| Article 4 directions recorded | 0 |
| Householder applications decided | 189 |
| Householder applications granted | 93% |
| Decided within 8 weeks | 70% |
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 Derbyshire Dales 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 Ashbourne South has the stock for it — the borough is built largely from Victorian and earlier houses (21% of 3,750 homes), 1970s and early-1980s houses (11%) and 2000s houses and apartments (11%), 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. Derbyshire Dales District Council judges the infill against the adopted Derbyshire Dales local plan and Derbyshire Dales District Council's design guidance for householder work, 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. Ashbourne South contains the Osmaston conservation area (Osmaston designated 1972), 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 Ashbourne South's terraces sit in conservation areas — Osmaston among them — where a side extension is no longer permitted development. No Article 4 direction is recorded for Derbyshire Dales District Council, but Ashbourne South's 1 conservation area still limit permitted development on those streets. We confirm the designation before a line is drawn.
Some single-storey side returns in Ashbourne South 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 Derbyshire Dales 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 Derbyshire Dales 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 Derbyshire Dales District Council's real householder decision record, drawn from official planning statistics and refreshed as new data lands. Derbyshire Dales District Council granted 93% of its householder applications in the year to 31 March 2026, and Osmaston 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 Osmaston, Clifton and Compton and Edlaston and Wyaston, 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 (21% of 3,750 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 3,750 homes here are 21% pre-1900, 11% 1973-1982, 11% 2000-2008, 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 Derbyshire Dales 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 Ashbourne South side returns come up most often:
Side return extension drawings for Osmaston's conservation area designated in 1972 — width-checked, party-wall detailed and drawn to Derbyshire Dales District Council's guidance.
Side return extension drawings for Clifton and Compton's civil parish within Ashbourne South — width-checked, party-wall detailed and drawn to Derbyshire Dales District Council's guidance.
Side return extension drawings for Edlaston and Wyaston's civil parish within Ashbourne South — width-checked, party-wall detailed and drawn to Derbyshire Dales District Council's guidance.
Side return extension drawings for Osmaston's civil parish within Ashbourne South — width-checked, party-wall detailed and drawn to Derbyshire Dales District Council's guidance.
Side return extension drawings for Yeldersley's civil parish within Ashbourne South — width-checked, party-wall detailed and drawn to Derbyshire Dales District Council's guidance.
Side return extension drawings for Ashbourne's civil parish within Ashbourne South — width-checked, party-wall detailed and drawn to Derbyshire Dales District Council's guidance.
Whether a side return in Ashbourne South 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 Derbyshire Dales 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 Osmaston, side extensions are not permitted development and always need a full application.
A fixed process built around how Derbyshire Dales District Council validates and decides side-return applications — most drawings are submission-ready within seven days of survey.
Send us your Ashbourne South 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 Derbyshire Dales 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 Derbyshire Dales 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 Derbyshire Dales 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 Ashbourne South you will need a full application to Derbyshire Dales District Council for anything wider or taller, for a two-storey side return, and for any side extension in a conservation area such as Osmaston, 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. Ashbourne South's period terraces are ideally suited to it, which is why the side return is one of the borough's most common extensions. Derbyshire Dales 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 Derbyshire Dales 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 Ashbourne South 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 Derbyshire Dales 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 Ashbourne South address specifically.
A householder planning application in Ashbourne South 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. Derbyshire Dales District Council is the decision-maker.
We price each Ashbourne South 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 Derbyshire Dales 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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