Dormer, hip-to-gable and mansard loft conversion drawings prepared by chartered professionals — delivered in seven days, revised free until your council says yes, and preceded by a free approval-odds score built from live decision data for your borough.
The same fixed process behind thousands of approved London drawing packs — most loft conversion plans are ready to submit within seven days of survey.
Enter your postcode and the conversion you have in mind. We score your approval odds against live loft decisions in your borough — before you spend anything.
We measure the roof space, head heights, ridge and eaves precisely — the numbers that determine whether your loft works — and draw your existing plans.
Chartered designers develop your dormer, hip-to-gable or mansard design to your brief and your council's roof-alteration guidance.
We submit the application or lawful development certificate, deal with your case officer, and revise the drawings free until you have a decision.
A loft conversion is the highest-value square footage most London homes will ever gain — a full extra bedroom and bathroom without losing a metre of garden. But roofs are where borough policy diverges most sharply. A full-width rear dormer that is permitted development in Enfield may be refused in a Camden conservation area; a mansard that Kensington and Chelsea expects would look alien on a 1930s semi in Kingston. Our loft conversion plans start with your roof type and your local planning authority's track record, not a template.
Most loft conversions in London proceed under permitted development, which allows up to 40 cubic metres of additional roof space on a terraced house and 50 cubic metres on semi-detached and detached homes. We draw to those tolerances exactly and prepare a lawful development certificate application, giving you council-stamped proof your conversion is legal — something every buyer's solicitor will ask for when you sell. Where full planning is needed, the same chartered team prepares dormer and mansard drawings composed to your borough's design guidance.
Your pack includes existing and proposed floor plans, elevations, roof plans and sections, delivered within seven days of survey. Revisions are free until your council issues a decision — and with a 96% approval rate across London and the Home Counties, revision is the exception rather than the rule.
Most loft conversions in London do not need planning permission — they fall under permitted development, provided the design stays within set volume and design limits. Your loft conversion will need a full planning application if any of the following apply:
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.
Whichever conversion suits your roof, the same team takes it from survey through planning to a buildable pack.
The classic London loft — a full-width flat-roof dormer to the rear, maximised to the 40 or 50 cubic metre allowance with a lawful development certificate to prove it.
For semis and end-of-terrace homes: the hipped roof rebuilt as a gable to unlock the full loft width, usually paired with a rear dormer.
The elegant answer for period terraces and conservation areas — a 72-degree slope with traditional detailing that conservation officers recognise and approve.
For Victorian houses with a rear outrigger: two connected dormers creating space for two rooms plus a bathroom in one consent.
The lightest touch — Velux-style windows within the existing slope, usually permitted development even in sensitive locations.
Floor joists, steels, stairs, fire escape and insulation drawn for building control, with structural calculations coordinated — ready for your builder to price.
We draw lofts the way your borough's planners expect to see them — and push for every cubic metre you are entitled to under permitted development.
Every roof and borough is different, so we price each project individually and guarantee a fixed, no-obligation quote within one working day. Your quote covers the full drawing pack with free revisions until your council approves — and we will tell you upfront if your loft qualifies as permitted development.
Most loft conversion plans are delivered within 7 days of the measured survey. A lawful development certificate or householder application then typically takes the council 8 weeks. We prepare and submit everything, so the only waiting is on the council's statutory clock.
Usually not. A rear dormer within 40 cubic metres on a terrace (50 on a semi or detached house), set back 20cm from the eaves and no higher than the ridge, is permitted development. Conservation areas and Article 4 streets are the main exceptions — we check yours before drawing.
There is no legal minimum, but 2.2m from the top of the existing ceiling joists to the underside of the ridge is the practical threshold once the new floor and insulation are in. Our measured survey confirms your dimensions before you commit, so you never pay for drawings of a loft that cannot work.
You need existing and proposed floor plans, existing and proposed elevations, a roof plan, a section showing head heights and the stair, and a site location plan. Every pack we produce matches your council's validation checklist exactly, whether you are applying for planning permission or a lawful development certificate.
Yes, always — even when no planning permission is needed. Building control covers the new floor structure, stairs, fire doors, escape windows, insulation and steel work. We produce the building regulation drawings and coordinate structural calculations as a follow-on pack, so one team carries the project through.
Yes — we cover 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 dormer or mansard drawings reflect how your council actually decides. Call 020 7864 7245 to check your area.
Local drawings tuned to each council's design guidance, with live borough approval rates. Pick your area:
Loft conversion plans in Ealing — dormer, hip-to-gable and mansard drawings submitted for you and revised free until your council approves.
View Ealing →Loft conversion plans in Wandsworth — dormer, hip-to-gable and mansard drawings submitted for you and revised free until your council approves.
View Wandsworth →Loft conversion plans in Bromley — dormer, hip-to-gable and mansard drawings submitted for you and revised free until your council approves.
View Bromley →Loft conversion plans in Barnet — dormer, hip-to-gable and mansard drawings submitted for you and revised free until your council approves.
View Barnet →Loft conversion plans in Harrow — dormer, hip-to-gable and mansard drawings submitted for you and revised free until your council approves.
View Harrow →Loft conversion plans in Sutton — dormer, hip-to-gable and mansard drawings submitted for you and revised free until your council approves.
View Sutton →Loft conversion plans in Richmond upon Thames — dormer, hip-to-gable and mansard drawings submitted for you and revised free until your council approves.
View Richmond upon Thames →Loft conversion plans in Kingston upon Thames — dormer, hip-to-gable and mansard drawings submitted for you and revised free until your council approves.
View Kingston upon Thames →Loft conversion plans in Camden — dormer, hip-to-gable and mansard drawings submitted for you and revised free until your council approves.
View Camden →Loft conversion plans in Islington — dormer, hip-to-gable and mansard drawings submitted for you and revised free until your council approves.
View Islington →Loft conversion plans in Haringey — dormer, hip-to-gable and mansard drawings submitted for you and revised free until your council approves.
View Haringey →Loft conversion plans in Enfield — dormer, hip-to-gable and mansard drawings submitted for you and revised free until your council approves.
View Enfield →Loft conversion plans in Waltham Forest — dormer, hip-to-gable and mansard drawings submitted for you and revised free until your council approves.
View Waltham Forest →Loft conversion plans in Hillingdon — dormer, hip-to-gable and mansard drawings submitted for you and revised free until your council approves.
View Hillingdon →Loft conversion plans in Hounslow — dormer, hip-to-gable and mansard drawings submitted for you and revised free until your council approves.
View Hounslow →Loft conversion plans in Hammersmith and Fulham — dormer, hip-to-gable and mansard drawings submitted for you and revised free until your council approves.
View Hammersmith and Fulham →Loft conversion plans in Kensington and Chelsea — dormer, hip-to-gable and mansard drawings submitted for you and revised free until your council approves.
View Kensington and Chelsea →Loft conversion plans in Westminster — dormer, hip-to-gable and mansard drawings submitted for you and revised free until your council approves.
View Westminster →Loft conversion plans in Merton — dormer, hip-to-gable and mansard drawings submitted for you and revised free until your council approves.
View Merton →Loft conversion plans in Lambeth — dormer, hip-to-gable and mansard drawings submitted for you and revised free until your council approves.
View Lambeth →Loft conversion plans in Croydon — dormer, hip-to-gable and mansard drawings submitted for you and revised free until your council approves.
View Croydon →Loft conversion plans in Hackney — dormer, hip-to-gable and mansard drawings submitted for you and revised free until your council approves.
View Hackney →Loft conversion plans in Newham — dormer, hip-to-gable and mansard drawings submitted for you and revised free until your council approves.
View Newham →Loft conversion plans in Redbridge — dormer, hip-to-gable and mansard drawings submitted for you and revised free until your council approves.
View Redbridge →Loft conversion plans in Barking and Dagenham — dormer, hip-to-gable and mansard drawings submitted for you and revised free until your council approves.
View Barking and Dagenham →Loft conversion plans in Havering — dormer, hip-to-gable and mansard drawings submitted for you and revised free until your council approves.
View Havering →Loft conversion plans in Greenwich — dormer, hip-to-gable and mansard drawings submitted for you and revised free until your council approves.
View Greenwich →Loft conversion plans in Lewisham — dormer, hip-to-gable and mansard drawings submitted for you and revised free until your council approves.
View Lewisham →Loft conversion plans in Bexley — dormer, hip-to-gable and mansard drawings submitted for you and revised free until your council approves.
View Bexley →Loft conversion plans in Southwark — dormer, hip-to-gable and mansard drawings submitted for you and revised free until your council approves.
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.