Two-storey extension drawings for Bolton homes — bedroom above, living space below, drawn against the 3-metre projection and 7-metre boundary rules and to Bolton Council's design guidance, delivered in days and revised free until your decision.
Bolton Council granted 87% of the householder planning decisions it made in its latest published year — level with the 87% England-wide householder average. The West Pennine Moors and Green Belt wrap the north of the borough, where extensions face openness and landscape-character tests, which is where a policy-literate drawing pack earns its keep. Its dominant Victorian (1837–1901), Edwardian (1901–1910), interwar (1918–1939) and postwar (1945–1970) 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. Bolton carries at least one Article 4 direction, and conservation areas including Chorley New Road, Barrow Bridge and Bradshaw Chapel remove those rights outright, so we confirm your exact address before a line is drawn. A validated householder application in Bolton is determined against an 8-week statutory target.
Heaton (large Victorian villas along the Chorley New Road conservation area), Bradshaw (stone cottages and the Bradshaw Chapel conservation area on the moorland edge), Horwich (terraced railway-works housing beneath Rivington moor), Egerton (a stone-built conservation village in the northern foothills), Smithills (moorland-fringe housing around the historic Smithills Hall estate) and Westhoughton (former mining and weaving town of brick and stone terraces) — these are the Bolton pockets our drawings cover most. Heritage designations here include Chorley New Road, Barrow Bridge, Bradshaw Chapel, Firwood Fold, Egerton and Halliwell. Bolton Council weighs each proposal against the Bolton Core Strategy (2011), the Allocations Plan (2014) and the Places for Everyone joint Greater Manchester plan, where conservation areas such as Barrow Bridge, Egerton and Firwood Fold require natural stone, stone-flag roofing and traditional detailing on visible alterations. Converted terraces and mill apartments appear around the town centre and Farnworth, and flats carry no householder permitted-development rights.. On roofs the borough is stone-flag and slate pitched roofs on the older cottages and terraces, gabled slate roofs on the Victorian villas and hipped roofs on the interwar semis, over stone-built weavers' cottages and terraces on the northern moorland edge, Victorian brick terraces around Halliwell and Farnworth, large Victorian and Edwardian villas along Chorley New Road and interwar and postwar semi-detached estates.
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. Bolton is largely stone-built weavers' cottages and terraces on the northern moorland edge, Victorian brick terraces around Halliwell and Farnworth, large Victorian and Edwardian villas along Chorley New Road and interwar and postwar semi-detached estates, and stone-flag and slate pitched roofs on the older cottages and terraces, gabled slate roofs on the Victorian villas and hipped roofs on the interwar semis 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 West Pennine Moors and Green Belt wrap the north of the borough, where extensions face openness and landscape-character tests. Bolton's twenty-six conservation areas — the grand Chorley New Road villa belt, the model industrial village of Barrow Bridge and the stone hamlet of Firwood Fold among them — carry Article 4 directions removing permitted-development rights so external changes match the historic stone and slate character.
Some two-storey rear extensions are permitted development. You will need a full application to Bolton 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 Bolton Council checks first — then submit a validation-complete pack.
Below is Bolton Council's real householder decision record, drawn from official planning statistics and refreshed as new data lands. Bolton grants a broadly average share of householder applications, with West Pennine Green Belt to the north and stone-vernacular conservation controls the main pressure points. 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 Heaton, Bradshaw and Horwich, 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 stone-built weavers' cottages and terraces on the northern moorland edge, 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.
Conservation areas such as Barrow Bridge, Egerton and Firwood Fold require natural stone, stone-flag roofing and traditional detailing on visible alterations. 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 Bolton. A few of the areas where they come up most often:
Two storey extension drawings for Heaton — large Victorian villas along the Chorley New Road conservation area — dimensioned against the 3m and 7m limits and drawn to Bolton Council's guidance.
Two storey extension drawings for Bradshaw — stone cottages and the Bradshaw Chapel conservation area on the moorland edge — dimensioned against the 3m and 7m limits and drawn to Bolton Council's guidance.
Two storey extension drawings for Horwich — terraced railway-works housing beneath Rivington moor — dimensioned against the 3m and 7m limits and drawn to Bolton Council's guidance.
Two storey extension drawings for Egerton — a stone-built conservation village in the northern foothills — dimensioned against the 3m and 7m limits and drawn to Bolton Council's guidance.
Two storey extension drawings for Smithills — moorland-fringe housing around the historic Smithills Hall estate — dimensioned against the 3m and 7m limits and drawn to Bolton Council's guidance.
Two storey extension drawings for Westhoughton — former mining and weaving town of brick and stone terraces — dimensioned against the 3m and 7m limits and drawn to Bolton 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 Bolton 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 Bolton Council validates and decides two-storey applications.
Send us your Bolton postcode and garden depth. We measure the 7-metre boundary rule against your plot, confirm designation status, and score your odds against live Bolton 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 Bolton 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 Bolton, the 7-metre rule is what most commonly forces a full application to Bolton 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 Bolton gardens this is decisive, and we measure it on survey before any design work rather than discovering it at validation. Bolton Council is the decision-maker.
Not under permitted development — two-storey side extensions always need a full application to Bolton 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.
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 Bolton address specifically. Bolton 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 Bolton Council's planning decision, so we flag the notice period early and detail the junction on the drawings.
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 Bolton address specifically. Bolton Council is the decision-maker.
We quote each Bolton 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 Bolton Council approves. Call 020 7864 7245 to start.
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