Single-storey, double-storey, rear and side extension drawings for Islington homes — measured to Islington Council's design guidance, delivered in days and revised free until your decision, with a free approval-odds check before you commit.
Islington Council granted 88% of the householder planning decisions it made in its latest published year — 1 point above the 87% England-wide householder average. With nearly every street inside a conservation area, permitted development rarely bites and full planning is the norm, which is where a policy-literate drawing pack earns its keep. Its dominant Georgian (1714–1837) and Victorian (1837–1901) 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. Islington carries at least one Article 4 direction, and conservation areas including Barnsbury, Canonbury and Clerkenwell remove those rights outright, so we confirm your exact address before a line is drawn. A validated householder application in Islington is determined against an 8-week statutory target.
Barnsbury (early-Victorian squares and Georgian terraces), Canonbury (leafy Georgian and Victorian streets), Clerkenwell (former warehouses and Georgian terraces turned into flats), Highbury (Victorian terraces ringing Highbury Fields), Angel (dense Georgian and Victorian terraces by the town centre) and Holloway (Victorian terraces and converted flats) — these are the Islington pockets our drawings cover most. Heritage designations here include Barnsbury, Canonbury, Clerkenwell, Duncan Terrace and Highbury Fields. Islington Council weighs each proposal against Islington Local Plan and the Urban Design Guide SPD, where mansard roof extensions have to follow the historic parapet line and echo neighbouring conversions. Converted flats and maisonettes dominate large parts of the borough, and none of them hold householder permitted-development rights.. On roofs the borough is butterfly / valley roofs behind parapets and mansard roofs on the Georgian terraces, over Georgian and early-Victorian terraces, converted flats and maisonettes and Victorian villas.
Islington homes come in a handful of recurring shapes, and each one points to a different extension. The borough is built largely from Georgian and early-Victorian terraces, converted flats and maisonettes and Victorian villas, so a Victorian terrace usually wants a rear or side-return infill, while an interwar semi has room for a wider single-storey wrap or a two-storey side addition. Islington Council judges every one of them against Islington Local Plan and the Urban Design Guide SPD, weighing footprint, height and the impact on the house next door before it looks at the elevations.
That is why the drawings decide the outcome. We set the extension depth against the permitted-development limits precisely, keep the eaves and ridge within the allowances, and plot the 45-degree daylight lines to the neighbours' windows so the case officer can see the amenity test is passed. With nearly every street inside a conservation area, permitted development rarely bites and full planning is the norm, so we design around it from the first sketch rather than discover it at validation.
Islington also protects whole streets — Barnsbury, Canonbury, Clerkenwell, Duncan Terrace and Highbury Fields among them. Islington is one of London's most conservation-covered boroughs, and Article 4 directions across areas such as Barnsbury and Canonbury remove permitted-development rights on most period streets. On designated land the larger-home extension route and most side extensions stop being permitted development, so we confirm your address against those layers before drawing a line.
Plenty of Islington extensions are permitted development and need no planning application — a single-storey rear extension within the depth and height limits is the common case. You will normally need to apply to Islington Council if any of these apply:
We draw the footprint, the ridge and eaves heights and the neighbours' daylight on the page — the relationships Islington Council's officers weigh first — and submit a validation-complete pack, whether that is a lawful development certificate, a prior-approval notification or a full householder application.
Below is Islington Council's real householder decision record, drawn from official planning statistics and refreshed as new data lands. Islington grants most householder applications, with blanket conservation-area coverage the single biggest factor shaping what can actually be built. A complete, policy-literate extension pack anticipates those pressure points before submission, which is why professionally drawn applications are decided faster and refused less often than DIY ones.
Source: MHCLG planning application statistics (householder decisions, rolling year). 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 Barnsbury, Canonbury and Clerkenwell, the extension that lands most often is the single-storey rear addition — a glazed kitchen-diner across the back of the house, kept within the permitted-development depth or taken to a full application where the ground floor wants more. On the borough's georgian and early-victorian terraces, a side-return infill frequently pairs with it to square off the plan; on wider victorian villas, a two-storey side or rear extension can add a bedroom above without swallowing the garden.
Mansard roof extensions have to follow the historic parapet line and echo neighbouring conversions. We size the extension to the amenity and daylight tests, match the roof and materials to the host house, and keep enough garden to satisfy Islington Council's space standards — so the scheme answers the borough's questions before an objection can raise them. Where permitted-development rights are used up or removed, we prepare the householder application to the council's extension design guidance instead.
We draw extensions on every street in the borough. A few of the neighbourhoods where Islington projects come up most often:
Extension drawings for Barnsbury's early-Victorian squares and Georgian terraces — footprint-checked, daylight-tested and drawn to Islington Council's guidance.
Extension drawings for Canonbury's leafy Georgian and Victorian streets — footprint-checked, daylight-tested and drawn to Islington Council's guidance.
Extension drawings for Clerkenwell's former warehouses and Georgian terraces turned into flats — footprint-checked, daylight-tested and drawn to Islington Council's guidance.
Extension drawings for Highbury's Victorian terraces ringing Highbury Fields — footprint-checked, daylight-tested and drawn to Islington Council's guidance.
Extension drawings for Angel's dense Georgian and Victorian terraces by the town centre — footprint-checked, daylight-tested and drawn to Islington Council's guidance.
Extension drawings for Holloway's Victorian terraces and converted flats — footprint-checked, daylight-tested and drawn to Islington Council's guidance.
The right extension in Islington depends on your house type and how much garden you can give up. This is how the main options compare on planning route and what they add.
| Extension type | Permitted development? | What it adds | What Islington Council checks |
|---|---|---|---|
| Single-storey rear | Often, within 3m/4m depth (6m/8m via prior approval) | Bigger kitchen-diner across the back | Depth, height, neighbour daylight (45°) |
| Side-return infill | Sometimes, if within width and height limits | Squares off an L-shaped ground floor | Width vs the original house, glazing to boundary |
| Two-storey rear/side | No — full application | Extra bedroom or bathroom above | Bulk, overlooking, 7m rear-boundary gap |
| Wraparound (rear + side) | No — full application | Whole-width open-plan ground floor | Combined footprint and garden retained |
Route depends on your street — conservation areas such as Barnsbury and Canonbury and Article 4 directions can remove permitted-development rights.
A fixed process built around how Islington Council validates and decides householder extension applications — most drawings are submission-ready within seven days of survey.
Tell us your Islington postcode and house type. We confirm your conservation and Article 4 status, how much permitted-development depth you have left, and score your odds against live Islington Council decisions.
We measure the existing footprint, floor and eaves levels, boundary distances and the neighbours' window positions — the numbers the depth limits and daylight tests depend on.
Chartered designers develop the single-storey, two-storey or side extension to your brief, drawn inside the permitted-development limits or to Islington Council's extension design guidance.
We submit the certificate, prior-approval notice or application, manage validation and case-officer queries, and revise the drawings free until Islington Council issues its decision.
Not always. 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 Islington you will need to apply to Islington Council for two-storey extensions, side extensions wider than half the house, anything forward of the front wall, deeper rear extensions under the larger-home prior-approval route, and any extension in a conservation area such as Barnsbury and Canonbury.
Standard permitted development allows 3 metres on a terraced or semi-detached house and 4 metres on a detached one. The larger-home extension scheme can double that to 6 or 8 metres, but it needs a prior-approval notification to Islington Council and a neighbour-consultation period, and it does not apply on designated land such as Islington's conservation areas. We confirm which route your property qualifies for before drawing.
Two-storey and double-storey extensions almost always need a full householder application to Islington Council, because they fall outside permitted development on most homes. The council looks closely at bulk, overlooking of neighbours and the 7-metre gap a two-storey rear extension must keep from the rear boundary. We design to those tests and show the daylight and privacy angles on the drawings.
A householder planning application in Islington runs to a statutory eight-week target, a larger-home prior-approval notification to around six weeks including the neighbour-consultation period, and a lawful development certificate to eight weeks. Incomplete submissions stall at validation, so we submit a complete pack and manage officer queries to keep the decision on schedule. Islington Council is the decision-maker.
Yes — planning permission and building regulations are separate consents, and almost every extension needs both. Planning governs whether you can build it; building control governs how it is built, covering structure, insulation, drainage and fire safety. We prepare the building-regulations drawings alongside the planning set so Islington Council's building control or an approved inspector can sign the work off.
Every house and brief is different, so we price each Islington extension individually and send a fixed, no-obligation quote back within one working day. It covers the full drawing pack with free revisions until Islington Council approves, and we tell you upfront whether your extension qualifies as permitted development. Call 020 7864 7245 to get started.
Answer five quick questions and get a free planning score for your exact address — instantly. Then, if you want the full picture, unlock the detailed analysis: your council's live approval rates, local precedents, constraints on your street and a step-by-step route to permission.
Same fixed quotes, same fast drawings — wherever your project is.