Two-storey extension drawings for Ashbrooke homes — bedroom above, living space below, drawn against the 3-metre projection and 7-metre boundary rules and to Sunderland City Council's design guidance, delivered in days and revised free until your decision.
Sunderland City Council granted 91% of the householder planning decisions it made in its latest published year — 4 points above the 87% England-wide householder average. The generous villa plots invite side and rear extensions, but officers guard the spacing and building lines that define Ashbrooke's low-density Victorian character, which is where a policy-literate drawing pack earns its keep. Its dominant Victorian (1837–1901) and Edwardian (1901–1910) 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. Ashbrooke carries at least one Article 4 direction, and conservation areas including Ashbrooke and The Cedars remove those rights outright, so we confirm your exact address before a line is drawn. A validated householder application in Ashbrooke is determined against an 8-week statutory target.
Ashbrooke (spacious tree-lined streets of high-status Victorian villas inside the conservation area), The Cedars (detached and semi-detached period houses in their own designated conservation area), Thornhill (later-Victorian houses around Langham Tower and Christ Church), Barnes (solid Edwardian terraces and semis on the western fringe of the suburb) and Mowbray Park edge (period frontages facing the historic park and museum quarter) — these are the Ashbrooke pockets our drawings cover most. Heritage designations here include Ashbrooke and The Cedars. Sunderland City Council weighs each proposal against the Sunderland Core Strategy and Development Plan, where loss of front gardens, boundary walls and mature trees on the conservation-area streets is a recurring reason for refusal or amendment. Many of Ashbrooke's largest villas have been subdivided into flats, and those units carry no householder permitted-development rights.. On roofs the borough is pitched slate roofs with decorative ridges on the villas and gabled and half-hipped roofs on the larger detached stock, over large Victorian and Edwardian villas, substantial semi-detached period houses and Arts-and-Crafts and Gothic-detailed houses around Thornhill.
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. Ashbrooke is largely large Victorian and Edwardian villas, substantial semi-detached period houses and Arts-and-Crafts and Gothic-detailed houses around Thornhill, and pitched slate roofs with decorative ridges on the villas and gabled and half-hipped roofs on the larger detached stock 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 generous villa plots invite side and rear extensions, but officers guard the spacing and building lines that define Ashbrooke's low-density Victorian character. Ashbrooke is Sunderland's flagship Victorian suburb and a designated conservation area, where the council's Article 4 controls on conversions to houses in multiple occupation and on external alterations mean changes to the grand villa frontages are rarely automatic.
Some two-storey rear extensions are permitted development. You will need a full application to Sunderland 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 Sunderland City Council checks first — then submit a validation-complete pack.
Below is Sunderland City Council's real householder decision record, drawn from official planning statistics and refreshed as new data lands. Sunderland approves the large majority of householder applications city-wide, but in Ashbrooke the conservation-area controls on its villa streets are the single biggest factor shaping what design will pass. 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.
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 Ashbrooke, The Cedars and Thornhill, 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 large victorian and edwardian 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.
Loss of front gardens, boundary walls and mature trees on the conservation-area streets is a recurring reason for refusal or amendment. 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 Ashbrooke. A few of the areas where they come up most often:
Two storey extension drawings for Ashbrooke — spacious tree-lined streets of high-status Victorian villas inside the conservation area — dimensioned against the 3m and 7m limits and drawn to Sunderland City Council's guidance.
Two storey extension drawings for The Cedars — detached and semi-detached period houses in their own designated conservation area — dimensioned against the 3m and 7m limits and drawn to Sunderland City Council's guidance.
Two storey extension drawings for Thornhill — later-Victorian houses around Langham Tower and Christ Church — dimensioned against the 3m and 7m limits and drawn to Sunderland City Council's guidance.
Two storey extension drawings for Barnes — solid Edwardian terraces and semis on the western fringe of the suburb — dimensioned against the 3m and 7m limits and drawn to Sunderland City Council's guidance.
Two storey extension drawings for Mowbray Park edge — period frontages facing the historic park and museum quarter — dimensioned against the 3m and 7m limits and drawn to Sunderland 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 Sunderland 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 Sunderland City Council validates and decides two-storey applications.
Send us your Ashbrooke postcode and garden depth. We measure the 7-metre boundary rule against your plot, confirm designation status, and score your odds against live Sunderland 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 Sunderland 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 Ashbrooke, the 7-metre rule is what most commonly forces a full application to Sunderland 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 Ashbrooke gardens this is decisive, and we measure it on survey before any design work rather than discovering it at validation. Sunderland City Council is the decision-maker.
Not under permitted development — two-storey side extensions always need a full application to Sunderland 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 Ashbrooke 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 Ashbrooke address specifically. Sunderland 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 Sunderland City Council's planning decision, so we flag the notice period early and detail the junction on the drawings. This applies to your Ashbrooke 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 Ashbrooke address specifically. Sunderland City Council is the decision-maker.
We quote each Ashbrooke 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 Sunderland City Council approves. Call 020 7864 7245 to start.
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