Two-storey extension drawings for Mannamead homes — bedroom above, living space below, drawn against the 3-metre projection and 7-metre boundary rules and to Plymouth City Council's design guidance, delivered in days and revised free until your decision.
Plymouth 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. Mannamead is one of Plymouth's most intact Victorian villa suburbs, and its designated conservation area protects the spacious, tree-lined plot pattern from over-development, which is where a policy-literate drawing pack earns its keep. Its dominant Victorian (1837–1901), Edwardian (1901–1910) and interwar (1918–1939) housing stock sets the design brief on most streets.
Under Class B, a rear dormer stays permitted development up to 40m³ of added roof volume on a terrace or 50m³ on a semi-detached or detached house, while Class A allows a single-storey rear extension of 3m beyond the original rear wall on a terrace and 4m on a detached house before a full application is needed. Mannamead carries at least one Article 4 direction, and conservation areas including Mannamead and North Stonehouse remove those rights outright, so we confirm your exact address before a line is drawn. A validated householder application in Mannamead is determined against an 8-week statutory target.
Mannamead Road (the spine of substantial Victorian villas that names the district), Seymour Road (tree-lined avenue of large detached period houses), Hartley (Edwardian and interwar semis on the rising ground above Mannamead), Compton (Victorian and Edwardian villas around Compton Park Road), Mutley Plain fringe (the busier southern edge shading into student-heavy Mutley) and Thornbury (interwar suburban housing on the northern slopes) — these are the Mannamead pockets our drawings cover most. Heritage designations here include Mannamead and North Stonehouse. Plymouth City Council weighs each proposal against the Plymouth and South West Devon Joint Local Plan (2019), where the larger detached villas are assessed for their setting, so side additions and outbuildings are weighed against garden space and mature planting. On roofs the borough is pitched and gabled slate roofs on the Victorian villas and hipped and half-hipped roofs on the Edwardian and interwar houses, over Victorian and Edwardian detached and semi-detached villas, Arts and Crafts and interwar houses on the higher ground and converted flats in some of the larger villas.
Adding at first floor changes the question the case officer asks. A single-storey extension is judged mostly on daylight and garden loss; a two-storey extension is judged on overlooking, bulk against the neighbouring roofline, and whether it reads as part of the house or bolted onto it. Mannamead is largely Victorian and Edwardian detached and semi-detached villas, Arts and Crafts and interwar houses on the higher ground and converted flats in some of the larger villas, and pitched and gabled slate roofs on the Victorian villas and hipped and half-hipped roofs on the Edwardian and interwar houses set what a matching roof actually means here.
The permitted-development route exists but is narrow: 3 metres of rear projection, a 7-metre stand-off from the rear boundary, eaves and ridge no higher than the original, and side-facing upper windows obscure-glazed and non-opening below 1.7 metres above floor level. Most two-storey schemes fail one of those, usually the 7-metre boundary rule on a shorter garden, and go in as a full application instead. We establish which route applies before designing, because it changes the drawing set.
Mannamead is one of Plymouth's most intact Victorian villa suburbs, and its designated conservation area protects the spacious, tree-lined plot pattern from over-development. Mannamead adjoins the Mutley and Greenbank streets covered by Plymouth's HMO Article 4 direction (in force 14 September 2012), which removed the permitted-development right to create a small house in multiple occupation, so a shared-house conversion on this fringe needs a planning application.
Some two-storey rear extensions are permitted development. You will need a full application to Plymouth City Council if any of these apply:
We set the projection and boundary distance on the site plan, prove the roof-pitch match on the elevations, and specify obscure glazing on the side windows — the three things Plymouth City Council checks first — then submit a validation-complete pack.
Below is Plymouth City Council's real householder decision record, drawn from official planning statistics and refreshed as new data lands. Plymouth approves a high proportion of householder applications in Mannamead, where protecting the leafy Victorian villa character and generous plots — rather than site pressure — is what most often shapes the conditions on a consent. Two-storey schemes attract more neighbour comment than any other householder work, so the overlooking and daylight case has to be made on the drawings.
Source: MHCLG planning application statistics (householder decisions, England, 1 April 2025 - 31 March 2026). Compare every borough on our London approval-rate league table.
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Across Mannamead Road, Seymour Road and Hartley, the schemes that succeed set the first floor back from the ground floor, keep the ridge below the original, and treat the flank wall as blank or obscure-glazed. On victorian and edwardian detached and semi-detached villas, matching the eaves line matters more than matching the brick: an extension that carries the existing eaves through reads as original even in a different material.
The larger detached villas are assessed for their setting, so side additions and outbuildings are weighed against garden space and mature planting. We draw the 45-degree daylight test from the neighbour's nearest habitable window, show the window positions in section, and set out the steel and foundation implications early — a two-storey extension changes the load path, so the structural design and the planning design have to be developed together rather than in sequence.
We draw two-storey extensions across Mannamead. A few of the areas where they come up most often:
Two storey extension drawings for Mannamead Road — the spine of substantial Victorian villas that names the district — dimensioned against the 3m and 7m limits and drawn to Plymouth City Council's guidance.
Two storey extension drawings for Seymour Road — tree-lined avenue of large detached period houses — dimensioned against the 3m and 7m limits and drawn to Plymouth City Council's guidance.
Two storey extension drawings for Hartley — Edwardian and interwar semis on the rising ground above Mannamead — dimensioned against the 3m and 7m limits and drawn to Plymouth City Council's guidance.
Two storey extension drawings for Compton — Victorian and Edwardian villas around Compton Park Road — dimensioned against the 3m and 7m limits and drawn to Plymouth City Council's guidance.
Two storey extension drawings for Mutley Plain fringe — the busier southern edge shading into student-heavy Mutley — dimensioned against the 3m and 7m limits and drawn to Plymouth City Council's guidance.
Two storey extension drawings for Thornbury — interwar suburban housing on the northern slopes — dimensioned against the 3m and 7m limits and drawn to Plymouth City Council's guidance.
The first-floor limits are tighter than the ground-floor ones. This is how the common cases compare.
| Scheme | Permitted development? | Deciding limit | What Plymouth City Council checks |
|---|---|---|---|
| Two-storey rear, 3m projection, 7m+ to boundary | Often yes | 3m projection / 7m boundary | Roof match, side-window glazing |
| Two-storey rear, under 7m to boundary | No — full application | Rear-boundary distance | Overlooking, daylight, garden loss |
| Two-storey side extension | No — full application | Side elevation | Gap to boundary, street rhythm |
| Two-storey wraparound | No — full application | Combined footprint | Bulk, massing, neighbour amenity |
| Any two-storey on designated land | No — full application | Designation | Character and appearance |
Limits from the GPDO 2015, Schedule 2, Part 1, Class A — two-storey rear extension conditions.
A fixed process built around how Plymouth City Council validates and decides two-storey applications.
Send us your Mannamead postcode and garden depth. We measure the 7-metre boundary rule against your plot, confirm designation status, and score your odds against live Plymouth City Council decisions.
We measure the original rear wall, eaves and ridge heights, garden depth and every neighbouring window that faces the site — the inputs the daylight and overlooking case is built from.
Chartered designers develop the two-storey addition to your brief with the roof and eaves resolved, and we coordinate the load path so the structural scheme and the planning scheme are the same building.
We submit the application, manage validation and case-officer queries, and revise the drawings free until Plymouth City Council issues its decision.
Often, but not always. A two-storey rear extension can be permitted development if it projects no more than 3 metres, sits at least 7 metres from the rear boundary, does not exceed the existing eaves and ridge, and has obscure-glazed non-opening side windows below 1.7 metres. In Mannamead, the 7-metre rule is what most commonly forces a full application to Plymouth City Council.
No part of a permitted-development two-storey rear extension may come within 7 metres of the boundary opposite the rear wall of the house. It exists to protect the neighbour behind you from being overlooked at first floor. On shorter Mannamead gardens this is decisive, and we measure it on survey before any design work rather than discovering it at validation. Plymouth City Council is the decision-maker.
Not under permitted development — two-storey side extensions always need a full application to Plymouth City Council. They are assessed on the gap to the boundary, whether the street's rhythm of spaces between houses survives, and whether the extension is subordinate to the original. Setting the first floor back from the front building line and down from the ridge is what usually makes the difference. This applies to your Mannamead address specifically.
Overlooking is the most common objection, and it is answerable on the drawings. We position habitable-room windows away from neighbouring gardens, obscure-glaze and fix shut anything on the flank below 1.7 metres, and show the sight lines in section. Where the geometry is tight, a rooflight or a high-level window gives the same daylight without the mutual overlooking that draws objections. This applies to your Mannamead address specifically. Plymouth City Council is the decision-maker.
Almost certainly. Excavating within 3 metres of a neighbouring structure and building on or up to the boundary both trigger the Party Wall etc. Act 1996, and a two-storey extension usually does both. It is entirely separate from Plymouth City Council's planning decision, so we flag the notice period early and detail the junction on the drawings. This applies to your Mannamead address specifically.
Yes. Adding a floor changes the load path from roof to foundation, so beams, padstones and foundation depths all need designing and calculating for building control. Planning and building regulations are separate consents, and the structural set is what building control assesses — we prepare both so the approved scheme is the buildable one. This applies to your Mannamead address specifically. Plymouth City Council is the decision-maker.
We quote each Mannamead two-storey extension individually, because plot depth, roof form and structural complexity vary house to house, and send a fixed, no-obligation quote within one working day. It covers the drawing pack with free revisions until Plymouth City Council approves. Call 020 7864 7245 to start.
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