Planning drawings for single and double-storey rear extensions — prepared by chartered professionals, delivered in seven days, and revised free until your council says yes. Start with a free approval-odds score built from live decision data for your borough.
(£565 if you supply measured drawings)
Single-storey rear extension
Fixed in writing after a free assessment of your property. Council planning fees are separate.
Every price is the total you pay. Checked 24 October 2026.
A rear extension is the most common home improvement in London — and the most commonly refused when the drawings ignore local policy. Each borough applies its own residential design guidance to depth, height, roof form and glazing, and a case officer in Ealing will read the same proposal very differently from one in Hackney. Our rear extension drawings start with your local planning authority: we check its recent decisions, its design supplements and any conservation-area or Article 4 constraints on your street before drawing a single line.
Your pack contains everything a householder application needs — existing and proposed floor plans, existing and proposed elevations, a site location plan and a block plan — all produced by chartered professionals who prepare rear extension plans for London homes every working day. Where your project qualifies for permitted development, we draw it to those exact tolerances and can prepare a lawful development certificate application instead, giving you formal proof your extension is legal.
Our guide to rear extension planning permission explains which route your extension needs before drawing starts. Because we stand behind every drawing, revisions are free until you have a decision. If your case officer asks for a reduced depth, a different roof or amended glazing, we amend and resubmit at no extra cost. That guarantee is why homeowners from Richmond to Romford send us their rear extensions first.
Most single storey rear extensions do not need planning permission — they fall under permitted development if they stay within set limits. Your rear extension will need a full planning application if any of the following apply:
Victorian terraces in Walthamstow, 1930s semis in Sutton, detached homes in Barnet — we draw rear extensions tuned to what your street's planners actually approve, and push for every metre you are entitled to.
A fixed four-step process refined over thousands of London drawing packs — most rear extension drawings are ready to submit within seven days of survey.
Tell us your postcode and what you want to build. We score your approval odds against live decision data from your borough before you commit to anything.
We capture accurate measurements of your home — in person or from verified survey data — and produce precise existing floor plans and elevations.
Chartered designers draw your rear extension to your brief and your council's guidance: floor plans, elevations, roof plans and site plans, ready for submission.
We submit through the Planning Portal, liaise with your case officer, and revise the drawings free of charge until your council issues a decision.
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.
Whatever shape your rear addition takes, the same team carries it from survey to submitted application — and on to building regulations when planning is granted.
The classic kitchen-diner extension across the back of the house — maximised under permitted development or full planning, with roof lights and glazing planners accept.
Extensions up to 6m on terraces and semis, 8m on detached homes, via the neighbour consultation scheme. We prepare the drawings and manage the prior approval process.
Two floors of space with carefully composed elevations that answer the stricter tests on outlook, overshadowing and neighbouring amenity that two storeys attract.
Light-filled rear rooms with bifold doors, level thresholds and structural openings — drawn so building control sign-off follows the planning approval smoothly.
Where your rear extension qualifies as permitted development, we prepare certificate drawings that give you council-stamped proof — essential when you sell.
Once planning is granted, we produce building regulation drawings and coordinate structural calculations so your builder can price accurately and start on site.
Every home and borough is different, so we price each project individually and guarantee a fixed, no-obligation quote within one working day. The quote covers your full drawing pack with free revisions until your council approves — and we will tell you upfront if your rear extension does not need planning permission at all.
Most rear extension drawings are delivered within 7 days of the measured survey. If a planning application is needed, the council then typically takes 8 weeks to determine it. We prepare and submit everything, so the only waiting is on the council's statutory clock, never on ours.
A householder application for a rear extension needs existing and proposed floor plans, existing and proposed elevations, a site location plan at 1:1250 and a block plan. Some London boroughs also request sections or a short design statement. Every pack we produce includes exactly what your council requires.
Under permitted development a single storey rear extension can extend 3m from the rear wall of a terraced or semi-detached house and 4m from a detached one, up to 4m high. With prior approval under the larger home extension scheme, that increases to 6m and 8m respectively, subject to neighbour consultation.
Yes. In conservation areas side extensions and rear extensions of more than one storey lose permitted development rights, and many London boroughs add Article 4 directions that remove more. We check your street's designations before drawing, so your rear extension plans follow the route most likely to be approved.
We revise the drawings and resubmit free of charge. Most refusals are fixed with targeted amendments — trimming the depth, lowering the eaves, adjusting a window. We design for approval first time, but if planners push back we keep working until you have a decision.
Yes — we prepare rear extension plans across all 33 London boroughs and the Home Counties, including Surrey, Kent, Essex and Hertfordshire. Because we track live approval data for each local planning authority, your drawings are tuned to how your specific council actually decides. Call 020 7864 7245 to check.
Local drawings tuned to each council's design guidance, with live borough approval rates. Pick your area:
Rear extension drawings in Ealing from £765 inc survey 🏠 We check SPD 4 and the 2022 design guidance first, then draw and submit. Get a fixed-fee quote.
View Ealing →
Rear extension drawings in Wandsworth from £765 inc survey 📐 We test daylight to the neighbours the way the council does, then draw and submit. Fixed fee.
View Wandsworth →
Rear extension drawings in Bromley from £765 inc survey 🏠 Drawn to the council's householder checklist so it is valid first time. Fixed fee.
View Bromley →Rear extension drawings in Barnet from £765 inc survey 📐 Drawn to the June 2026 SPD: 3 m terrace, 3.5 m semi, 4 m detached, half the garden at most.
View Barnet →
Rear extension drawings in Harrow — single and double-storey back extensions drawn to depth and daylight limits, submitted and revised free.
View Harrow →Rear extension drawings in Sutton — single and double-storey back extensions drawn to depth and daylight limits, submitted and revised free.
View Sutton →Rear extension drawings in Richmond upon Thames — single and double-storey back extensions drawn to depth and daylight limits, submitted and revised free.
View Richmond upon Thames →Rear extension drawings in Kingston upon Thames — single and double-storey back extensions drawn to depth and daylight limits, submitted and revised free.
View Kingston upon Thames →Rear extension drawings in Camden — single and double-storey back extensions drawn to depth and daylight limits, submitted and revised free.
View Camden →Rear extension drawings in Islington — single and double-storey back extensions drawn to depth and daylight limits, submitted and revised free.
View Islington →Rear extension drawings in Haringey from £765 inc survey 🏠 We apply the council's own tests, and South Tottenham's 3 and 4 metre rule. Fixed fee.
View Haringey →Rear extension drawings in Enfield from £765 inc survey 📐 Drawn to policy DMD 11: 3 and 4 metre depths, 45 degree line, 30 degree upper floor.
View Enfield →Rear extension drawings in Waltham Forest — single and double-storey back extensions drawn to depth and daylight limits, submitted and revised free.
View Waltham Forest →Rear extension drawings in Hillingdon — single and double-storey back extensions drawn to depth and daylight limits, submitted and revised free.
View Hillingdon →Rear extension drawings in Hounslow — single and double-storey back extensions drawn to depth and daylight limits, submitted and revised free.
View Hounslow →Rear extension drawings in Brent from £765 inc survey 📐 Drawn to the January 2025 SPD: 6 m or 8 m deep, capped at half your garden. Fixed fee, we submit.
View Brent →Rear extension drawings in Hammersmith and Fulham — single and double-storey back extensions drawn to depth and daylight limits, submitted and revised free.
View Hammersmith and Fulham →Rear extension drawings in Kensington and Chelsea — single and double-storey back extensions drawn to depth and daylight limits, submitted and revised free.
View Kensington and Chelsea →Rear extension drawings in Westminster — single and double-storey back extensions drawn to depth and daylight limits, submitted and revised free.
View Westminster →Rear extension drawings in Merton — single and double-storey back extensions drawn to depth and daylight limits, submitted and revised free.
View Merton →Rear extension drawings in Lambeth from £765 inc survey 🏠 Closet returns, stepped rears and Article 4 streets checked before we draw. Fixed fee, we submit.
View Lambeth →Rear extension drawings in Croydon from £765 inc survey 📍 Built to the May 2026 validation list, not the revoked 2019 design guide. Fixed fee, we submit.
View Croydon →Rear extension drawings in Hackney — single and double-storey back extensions drawn to depth and daylight limits, submitted and revised free.
View Hackney →Rear extension drawings in Tower Hamlets — single and double-storey back extensions drawn to depth and daylight limits, submitted and revised free.
View Tower Hamlets →Rear extension drawings in Newham — single and double-storey back extensions drawn to depth and daylight limits, submitted and revised free.
View Newham →Rear extension drawings in Redbridge — single and double-storey back extensions drawn to depth and daylight limits, submitted and revised free.
View Redbridge →Rear extension drawings in Barking and Dagenham — single and double-storey back extensions drawn to depth and daylight limits, submitted and revised free.
View Barking and Dagenham →Rear extension drawings in Havering — single and double-storey back extensions drawn to depth and daylight limits, submitted and revised free.
View Havering →Rear extension drawings in Greenwich — single and double-storey back extensions drawn to depth and daylight limits, submitted and revised free.
View Greenwich →Rear extension drawings in Lewisham — single and double-storey back extensions drawn to depth and daylight limits, submitted and revised free.
View Lewisham →Rear extension drawings in Bexley — single and double-storey back extensions drawn to depth and daylight limits, submitted and revised free.
View Bexley →Rear extension drawings in Southwark from £765 inc survey 📐 Drawn to the July 2025 Householder SPD, with the fire safety form sorted. Fixed fee, we submit.
View Southwark →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.