Back-of-house extension drawings for Manor homes — the glazed kitchen-diner across the rear, drawn to Sefton Metropolitan Borough Council's depth and daylight limits, delivered in days and revised free until your decision, with a free approval-odds check first.
Sefton Metropolitan Borough Council granted 96% of the householder planning decisions it made in its latest published year — 9 points above the 87% England-wide householder average. Manor contains Crosby Hall Conservation Area, Homer Green Conservation Area, Little Crosby Conservation Area conservation areas (Crosby Hall Conservation Area designated 1985), so materials, fenestration and roof form are assessed against the appraisal, which is where a policy-literate drawing pack earns its keep. Its dominant 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. Manor carries at least one Article 4 direction, and conservation areas including Crosby Hall Conservation Area, Homer Green Conservation Area and Little Crosby Conservation Area remove those rights outright, so we confirm your exact address before a line is drawn. A validated householder application in Manor is determined against an 8-week statutory target.
Crosby Hall (conservation area designated in 1985), Homer Green (conservation area designated in 1991), Little Crosby (conservation area designated in 1974), Moor Park (conservation area designated in 1987), Sefton (civil parish within Manor), Thornton (civil parish within Manor) and Hightown (civil parish within Manor) — these are the Manor pockets our drawings cover most. Heritage designations here include Crosby Hall Conservation Area, Homer Green Conservation Area, Little Crosby Conservation Area and Moor Park Conservation Area. Sefton Metropolitan Borough Council weighs each proposal against Sefton Metropolitan Borough Council's development plan and the design policies it applies to householder applications, where the 5,910 homes here are 20% 1930-1939, 18% 1955-1964, 15% 1945-1954, which is what sets the realistic roof and rear-projection options. On roofs the borough is hipped roofs with shallow pitches typical of 1930s building and shallow gabled roofs typical of that period's building, over 1930s semi-detached and detached houses (20% of 5,910 homes), late-1950s and early-1960s houses (18%) and early postwar houses (15%).
What is permitted in Manor turns on designation first, so that is where we start: Crosby Hall (conservation area designated in 1985), Homer Green (conservation area designated in 1991), Little Crosby (conservation area designated in 1974) and Moor Park (conservation area designated in 1987). Inside those boundaries permitted development is curtailed and Sefton Metropolitan 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, Manor takes in Sefton, Thornton and Hightown. Sefton Metropolitan Borough Council has 6 recorded Article 4 directions, removing permitted development for rear and side extensions and roof enlargements such as dormers — check the address before assuming PD applies in Manor.
On stock, Manor is 1930s semi-detached and detached houses (20% of 5,910 homes), late-1950s and early-1960s houses (18%) and early postwar houses (15%) — which is why hipped roofs with shallow pitches typical of 1930s building and shallow gabled roofs typical of that period's building govern what a loft or rear projection can realistically be. Sefton Metropolitan Borough Council decided 589 householder applications in the latest published year and granted 96%, with 71% issued inside the eight-week target. We draw to that record rather than to a national average.
The full build-period split for Manor runs pre-1900 4% (210 homes), 1900-1918 2% (140 homes), 1919-1929 3% (180 homes), 1930-1939 20% (1,180 homes), 1945-1954 15% (870 homes), 1955-1964 18% (1,080 homes), 1965-1972 10% (570 homes), 1973-1982 7% (400 homes), 1983-1992 13% (750 homes), 1993-1999 1% (40 homes) and 2000-2008 1% (80 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.
Sefton Metropolitan Borough Council also decides for Church, Duke's, Harington, Meols, Park, Ravenmeols and Sudell, so a decision in Manor 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.
The Article 4 directions recorded for this council include Aintree HMO, Bootle and Waterloo HMO, Moor Park Conservation Area and Park House. Each removes a specific permitted-development right inside its own boundary, which is why the check is done on the address rather than on the town.
Published figures for Manor and Sefton Metropolitan 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 | Manor |
|---|---|
| Dwellings recorded | 5,910 |
| Built pre-1900 | 210 (4%) |
| Built 1900-1918 | 140 (2%) |
| Built 1919-1929 | 180 (3%) |
| Built 1930-1939 | 1,180 (20%) |
| Built 1945-1954 | 870 (15%) |
| Built 1955-1964 | 1,080 (18%) |
| Built 1965-1972 | 570 (10%) |
| Built 1973-1982 | 400 (7%) |
| Built 1983-1992 | 750 (13%) |
| Built 1993-1999 | 40 (1%) |
| Built 2000-2008 | 80 (1%) |
| Built before 1919 | 6% |
| Built 1919–1939 | 23% |
| Built 1945–2008 | 64% |
| Conservation areas in Manor | 4 (Crosby Hall Conservation Area, Homer Green Conservation Area…) |
| Conservation areas district-wide | 25 |
| Article 4 directions recorded | 6 |
| Householder applications decided | 589 |
| Householder applications granted | 96% |
| Decided within 8 weeks | 71% |
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 Sefton Metropolitan Borough Council's own, from MHCLG live table PS2 for the year to 31 March 2026.
The rear extension is the workhorse of Manor home improvement — it is how a dark back kitchen becomes an open family room facing the garden. Because the borough is built largely from 1930s semi-detached and detached houses (20% of 5,910 homes), late-1950s and early-1960s houses (18%) and early postwar houses (15%), most back walls sit close to a neighbour on at least one side, and that proximity, not the design, is what Sefton Metropolitan Borough Council scrutinises. The council reads the proposal against Sefton Metropolitan Borough Council's development plan and the design policies it applies to householder applications, 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. Manor contains Crosby Hall Conservation Area, Homer Green Conservation Area, Little Crosby Conservation Area conservation areas (Crosby Hall Conservation Area designated 1985), so materials, fenestration and roof form are assessed against the appraisal, so the rear elevation is composed around it rather than corrected after an objection.
Where the property sits in a conservation area — Crosby Hall Conservation Area, Homer Green Conservation Area, Little Crosby Conservation Area and Moor Park Conservation Area among Manor's — the larger-home extension route is switched off and even a modest rear addition needs consent. Sefton Metropolitan Borough Council has 6 recorded Article 4 directions, removing permitted development for rear and side extensions and roof enlargements such as dormers — check the address before assuming PD applies in Manor. We confirm the designation before the survey.
Many single-storey rear extensions in Manor are permitted development and need no application. You will normally need to apply to Sefton Metropolitan Borough 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 Sefton Metropolitan Borough 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 Sefton Metropolitan Borough Council's real householder decision record, taken from official planning statistics and refreshed as new data lands. Sefton Metropolitan Borough Council granted 96% of its householder applications in the year to 31 March 2026, and Crosby Hall Conservation Area shapes what is approved here. 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 Crosby Hall, Homer Green and Little Crosby, 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 1930s semi-detached and detached houses (20% of 5,910 homes), 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 5,910 homes here are 20% 1930-1939, 18% 1955-1964, 15% 1945-1954, which is what sets the realistic roof and rear-projection options. We keep the extension inside the daylight splays, set any glazed roof below the first-floor cill, and retain the garden depth Sefton Metropolitan Borough 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 Manor back-of-house projects come up most often:
Rear extension drawings for Crosby Hall's conservation area designated in 1985 — depth-checked, daylight-tested and drawn to Sefton Metropolitan Borough Council's guidance.
Rear extension drawings for Homer Green's conservation area designated in 1991 — depth-checked, daylight-tested and drawn to Sefton Metropolitan Borough Council's guidance.
Rear extension drawings for Little Crosby's conservation area designated in 1974 — depth-checked, daylight-tested and drawn to Sefton Metropolitan Borough Council's guidance.
Rear extension drawings for Moor Park's conservation area designated in 1987 — depth-checked, daylight-tested and drawn to Sefton Metropolitan Borough Council's guidance.
Rear extension drawings for Sefton's civil parish within Manor — depth-checked, daylight-tested and drawn to Sefton Metropolitan Borough Council's guidance.
Rear extension drawings for Thornton's civil parish within Manor — depth-checked, daylight-tested and drawn to Sefton Metropolitan Borough Council's guidance.
How far you can extend at the back in Manor depends on your house type and the route you take. This is how the options compare.
| Route | Depth allowed | Consent needed | What Sefton Metropolitan Borough 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 Crosby Hall Conservation Area and Homer Green Conservation Area and Article 4 streets need a full application.
A fixed process built around how Sefton Metropolitan Borough Council validates and decides rear-extension applications — most drawings are submission-ready within seven days of survey.
Send us your Manor 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 Sefton Metropolitan Borough 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 Sefton Metropolitan Borough 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 Sefton Metropolitan Borough 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 Manor. You will need to involve Sefton Metropolitan Borough 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 Crosby Hall Conservation Area and Homer Green Conservation Area, 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 Sefton Metropolitan Borough 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 Manor's conservation areas.
It is the daylight test Sefton Metropolitan Borough 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 Manor address specifically.
A two-storey rear extension almost always needs a full householder application to Sefton Metropolitan Borough 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 Manor 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 Sefton Metropolitan Borough 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 Manor address specifically.
We price each Manor 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 Sefton Metropolitan Borough 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.
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