Back-of-house extension drawings for Darley Abbey homes — the glazed kitchen-diner across the rear, drawn to Derby City Council's depth and daylight limits, delivered in days and revised free until your decision, with a free approval-odds check first.
Derby 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. Darley Abbey lies within the Derwent Valley Mills World Heritage Site, so alterations are tested against WHS Outstanding Universal Value and its setting, not ordinary householder policy alone, which is where a policy-literate drawing pack earns its keep. Its dominant Georgian (1714–1837), Victorian (1837–1901) and interwar (1918–1939) 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 Darley Abbey, Allestree and Strutts Park those rights are removed, so we confirm your exact address before a line is drawn. A validated householder application in Darley Abbey is determined against an 8-week statutory target.
Darley Abbey village (the most complete 18th-century mill village in the world, built around the Boar's Head Mills), Darley Abbey Mills (the restored Evans cotton-mill complex, now workspace and event venues, dating 1782-1830), Darley Park (riverside parkland and larger houses on the west bank of the Derwent), Old Lane (terraced and detached mill-era cottages climbing from the river), Abbey Lane (the historic approach past St Matthew's Church) and Broadway (interwar and later houses on the northern edge of the village) — these are the Darley Abbey pockets our drawings cover most. Heritage designations here include Darley Abbey, Allestree and Strutts Park. Derby City Council weighs each proposal against the Derby City Local Plan Part 1 (Core Strategy) and Part 2, where the village holds a dense concentration of listed mill and cottage buildings, so many works need listed building consent alongside planning permission. On roofs the borough is steep gabled roofs on the Georgian mill cottages and pitched roofs on the later village houses, over late-18th and early-19th-century mill-workers' housing built by the Evans family, the Boar's Head cotton mill complex and associated buildings and later Victorian and interwar houses on the village fringe.
The rear extension is the workhorse of Darley Abbey home improvement — it is how a dark back kitchen becomes an open family room facing the garden. Because the borough is built largely from late-18th and early-19th-century mill-workers' housing built by the Evans family, the Boar's Head cotton mill complex and associated buildings and later Victorian and interwar houses on the village fringe, most back walls sit close to a neighbour on at least one side, and that proximity, not the design, is what Derby City Council scrutinises. The council reads the proposal against the Derby City Local Plan Part 1 (Core Strategy) and Part 2, and the first line an officer draws is the 45-degree splay from the neighbour's nearest window.
So the drawings live or die on geometry. We set the depth against the exact permitted-development figure, hold the eaves and the flat-roof or lantern build-up under the 4-metre height ceiling, and show the projection tested against both the 45-degree plan angle and the 25-degree section angle to the neighbouring windows. Darley Abbey lies within the Derwent Valley Mills World Heritage Site, so alterations are tested against WHS Outstanding Universal Value and its setting, not ordinary householder policy alone, so the rear elevation is composed around it rather than corrected after an objection.
Where the property sits in a conservation area — Darley Abbey, Allestree and Strutts Park among Darley Abbey's — the larger-home extension route is switched off and even a modest rear addition needs consent. Darley Abbey village sits north of the Ring Road, so it is outside the inner-city area covered by Derby's HMO Article 4 direction; instead its permitted-development freedoms are constrained by conservation-area status and its position inside the Derwent Valley Mills World Heritage Site. We confirm the designation before the survey.
Many single-storey rear extensions in Darley Abbey are permitted development and need no application. You will normally need to apply to Derby City Council, or use the larger-home prior-approval route, if any of these apply:
We draw the depth, the roof build-up and the daylight splays to each neighbour on the page — the tests Derby City Council's officers apply first — and submit a validation-complete pack, whether that is a lawful development certificate, a larger-home prior-approval notice or a full householder application.
Below is Derby City Council's real householder decision record, taken from official planning statistics and refreshed as new data lands. Derby approves most applications it determines, but in Darley Abbey World Heritage Site status, listed mill-village buildings and conservation detail make design and heritage justification the decisive factors. Rear extensions turn most often on neighbour daylight and depth, so a drawing pack that proves those tests 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 Darley Abbey village, Darley Abbey Mills and Darley Park, the approved rear extension is typically a single-storey glazed box within the depth limit, roofed either flat with a lantern or in a shallow mono-pitch, and finished in brick or render to match the host wall. On the borough's late-18th and early-19th-century mill-workers' housing built by the evans family, keeping the projection to the permitted-development figure often avoids an application entirely; where owners want the full 6 metres, the larger-home route succeeds when the neighbour-consultation period passes without a sustained objection.
The village holds a dense concentration of listed mill and cottage buildings, so many works need listed building consent alongside planning permission. We keep the extension inside the daylight splays, set any glazed roof below the first-floor cill, and retain the garden depth Derby City Council expects — so the back elevation answers the amenity case before a neighbour can lodge one. Two-storey rear extensions we draw with the 7-metre boundary gap and privacy screening resolved on the plan.
We draw rear extensions on every street in the borough. A few of the neighbourhoods where Darley Abbey back-of-house projects come up most often:
Rear extension drawings for Darley Abbey village's the most complete 18th-century mill village in the world, built around the Boar's Head Mills — depth-checked, daylight-tested and drawn to Derby City Council's guidance.
Rear extension drawings for Darley Abbey Mills's the restored Evans cotton-mill complex, now workspace and event venues, dating 1782-1830 — depth-checked, daylight-tested and drawn to Derby City Council's guidance.
Rear extension drawings for Darley Park's riverside parkland and larger houses on the west bank of the Derwent — depth-checked, daylight-tested and drawn to Derby City Council's guidance.
Rear extension drawings for Old Lane's terraced and detached mill-era cottages climbing from the river — depth-checked, daylight-tested and drawn to Derby City Council's guidance.
Rear extension drawings for Abbey Lane's the historic approach past St Matthew's Church — depth-checked, daylight-tested and drawn to Derby City Council's guidance.
Rear extension drawings for Broadway's interwar and later houses on the northern edge of the village — depth-checked, daylight-tested and drawn to Derby City Council's guidance.
How far you can extend at the back in Darley Abbey depends on your house type and the route you take. This is how the options compare.
| Route | Depth allowed | Consent needed | What Derby City Council checks |
|---|---|---|---|
| Standard permitted development | 3m terrace/semi · 4m detached | Lawful development certificate (optional) | Depth, 4m height, materials |
| Larger-home prior approval | 6m terrace/semi · 8m detached | Prior-approval notice + neighbour consultation | Neighbour objections on amenity |
| Full householder application | Beyond the above, or two-storey | Full planning permission | Daylight (45°/25°), bulk, garden retained |
| Conservation area | Case by case | Full planning permission | Character, roof form, boundary treatment |
The larger-home route is switched off on designated land — conservation areas such as Darley Abbey and Allestree and Article 4 streets need a full application.
A fixed process built around how Derby City Council validates and decides rear-extension applications — most drawings are submission-ready within seven days of survey.
Send us your Darley Abbey postcode and house type. We confirm your conservation and Article 4 status, how much rear-extension depth you have under permitted development, and score your odds against live Derby City Council decisions.
We measure the original rear wall, floor and eaves levels, side and rear boundary distances and the neighbours' window positions — the numbers the depth limit and daylight splays depend on.
Chartered designers develop the single or two-storey rear extension to your brief, drawn inside the permitted-development limits or to Derby City Council's extension design guidance, with the daylight angles shown.
We submit the certificate, prior-approval notice or application, handle validation and case-officer queries, and revise the drawings free until Derby City Council issues its decision.
Often not. A single-storey rear extension up to 3 metres deep on a terrace or semi, or 4 metres on a detached house, and no higher than 4 metres, is usually permitted development in Darley Abbey. You will need to involve Derby City Council for anything deeper via the larger-home route, for two-storey rear extensions, and for any rear extension in a conservation area such as Darley Abbey and Allestree, where those permitted-development rights fall away.
The larger-home extension scheme lets a single-storey rear extension reach 6 metres on a terrace or semi, or 8 metres on a detached house — double the standard allowance. It is not automatic: you submit a prior-approval notification to Derby City Council, neighbours are consulted, and if one objects on amenity grounds the council rules on it. It also does not apply on designated land such as Darley Abbey's conservation areas.
It is the daylight test Derby City Council applies to protect neighbours. Drawn on plan, a line at 45 degrees from the midpoint of the neighbour's nearest ground-floor window should not be crossed by your extension; a companion 25-degree line is checked in section. If the projection breaches it, the extension is likely to be shortened or refused, so we test and prove it on the drawings before submission. This applies to your Darley Abbey address specifically.
A two-storey rear extension almost always needs a full householder application to Derby City Council, as it sits outside permitted development on most homes. The council checks that it stays at least 7 metres from the rear boundary, does not overbear the neighbours and avoids new overlooking. We resolve the boundary gap, privacy and daylight on the plans so the application is decided on its merits. This applies to your Darley Abbey address specifically.
Frequently, yes. If the rear extension involves work to a shared wall, building up to the boundary, or excavating foundations near a neighbour's structure, the Party Wall etc. Act applies and you must serve notice — this is separate from Derby City Council's planning decision. We flag it early and can prepare the drawings a party-wall surveyor needs alongside the planning set. This applies to your Darley Abbey address specifically.
We price each Darley Abbey rear extension on its own footprint and send a fixed, no-obligation quote within one working day. It covers the full drawing pack with free revisions until Derby City Council approves, and we confirm at the outset whether your extension is permitted development, needs prior approval, or a full application. Call 020 7864 7245 to begin.
Answer five quick questions and get a free planning score for your exact address — instantly. Then, if you want the full picture, unlock the detailed analysis: your council's live approval rates, local precedents, constraints on your street and a step-by-step route to permission.
Same fixed quotes, same fast drawings — wherever your project is.