Two-storey extension drawings for Mousehold homes — bedroom above, living space below, drawn against the 3-metre projection and 7-metre boundary rules and to Norwich City Council's design guidance, delivered in days and revised free until your decision.
Norwich 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. The Mile Cross conservation area protects a nationally notable early garden-suburb layout, so the symmetry and building line of the estate constrain alterations, 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. In conservation areas such as Sewell, Mile Cross and Thorpe Hamlet those rights are removed, so we confirm your exact address before a line is drawn. A validated householder application in Mousehold is determined against an 8-week statutory target.
Sewell Park (planned Edwardian terraces framing the park near Constitution Hill), Mile Cross (one of the country's early interwar municipal garden suburbs), Constitution Hill (Victorian and Edwardian terraces climbing toward the heath), Gurney Road (houses fronting the open expanse of Mousehold Heath), Wolfe Road (compact terraces on the eastern heath fringe) and Silver Road (dense Victorian terraces between the city and the heath) — these are the Mousehold pockets our drawings cover most. Heritage designations here include Sewell, Mile Cross and Thorpe Hamlet. Norwich City Council weighs each proposal against the Greater Norwich Local Plan and the Norwich Development Management Policies, where the planned Edwardian character of Sewell Park expects frontages, bays and boundary treatments to be retained. On roofs the borough is pitched and gabled slate roofs on the Edwardian terraces and hipped tiled roofs on the interwar garden-suburb houses, over Edwardian terraces around Sewell Park, interwar garden-suburb housing at Mile Cross and Victorian terraces on the heath fringe.
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. Mousehold is largely Edwardian terraces around Sewell Park, interwar garden-suburb housing at Mile Cross and Victorian terraces on the heath fringe, and pitched and gabled slate roofs on the Edwardian terraces and hipped tiled roofs on the interwar garden-suburb 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.
The Mile Cross conservation area protects a nationally notable early garden-suburb layout, so the symmetry and building line of the estate constrain alterations. The Mousehold Heath fringe lies outside the city-centre office-to-residential Article 4 area and has no HMO direction, so most houses keep permitted-development rights — but the Sewell Park and Mile Cross conservation areas remove the usual rights over their planned Edwardian and interwar frontages.
Some two-storey rear extensions are permitted development. You will need a full application to Norwich 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 Norwich City Council checks first — then submit a validation-complete pack.
Below is Norwich City Council's real householder decision record, drawn from official planning statistics and refreshed as new data lands. Norwich approves roughly 93% of applications, but on the Mousehold fringe the protected garden-suburb layout at Mile Cross and the planned Sewell Park streets are what govern the design of extensions. 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 Sewell Park, Mile Cross and Constitution Hill, 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 edwardian terraces around sewell park, 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 planned Edwardian character of Sewell Park expects frontages, bays and boundary treatments to be retained. 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 Mousehold. A few of the areas where they come up most often:
Two storey extension drawings for Sewell Park — planned Edwardian terraces framing the park near Constitution Hill — dimensioned against the 3m and 7m limits and drawn to Norwich City Council's guidance.
Two storey extension drawings for Mile Cross — one of the country's early interwar municipal garden suburbs — dimensioned against the 3m and 7m limits and drawn to Norwich City Council's guidance.
Two storey extension drawings for Constitution Hill — Victorian and Edwardian terraces climbing toward the heath — dimensioned against the 3m and 7m limits and drawn to Norwich City Council's guidance.
Two storey extension drawings for Gurney Road — houses fronting the open expanse of Mousehold Heath — dimensioned against the 3m and 7m limits and drawn to Norwich City Council's guidance.
Two storey extension drawings for Wolfe Road — compact terraces on the eastern heath fringe — dimensioned against the 3m and 7m limits and drawn to Norwich City Council's guidance.
Two storey extension drawings for Silver Road — dense Victorian terraces between the city and the heath — dimensioned against the 3m and 7m limits and drawn to Norwich 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 Norwich 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 Norwich City Council validates and decides two-storey applications.
Send us your Mousehold postcode and garden depth. We measure the 7-metre boundary rule against your plot, confirm designation status, and score your odds against live Norwich 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 Norwich 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 Mousehold, the 7-metre rule is what most commonly forces a full application to Norwich 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 Mousehold gardens this is decisive, and we measure it on survey before any design work rather than discovering it at validation. Norwich City Council is the decision-maker.
Not under permitted development — two-storey side extensions always need a full application to Norwich 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 Mousehold 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 Mousehold address specifically. Norwich 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 Norwich City Council's planning decision, so we flag the notice period early and detail the junction on the drawings. This applies to your Mousehold 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 Mousehold address specifically. Norwich City Council is the decision-maker.
We quote each Mousehold 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 Norwich City Council approves. Call 020 7864 7245 to start.
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