Planning a loft conversion in London? Draw & Plan prepares loft conversion drawings for homeowners who want to turn an existing roof space into a bedroom, office or bathroom. Your architectural designer personally visits the property during the measured survey to discuss your ideas and assess the proposed loft design in the context of the existing building. Our planning drawings show the proposed layout, roof form, elevations and relationship to the house; our Building Regulations drawings add the technical information needed for Building Control and construction.
We review the property and proposed roof changes before confirming whether the project is likely to need planning permission, a Lawful Development Certificate for a loft conversion, prior approval or another route. A proposal is not automatically permitted development: the correct route depends on the property, location, roof alteration, volume and previous development. We prepare fixed-fee drawings for rear dormer, hip-to-gable, rooflight, mansard and L-shaped loft conversions across Greater London.
For borough-specific context, read our Sutton extension and loft conversion planning guide.
Example drawing set
This residential loft conversion set shows how the existing survey drawings develop into proposed planning drawings. Each sheet is presented at its natural proportions so the full drawing remains clear. For more examples, compare our Drawing Samples, or see related Past Projects including combined house extension and loft conversion work in Lewisham and Hertsmere.
Complete drawing package
A coordinated package for the council, Building Control and your builder. Structural calculations are additional and are not included in package prices.
Fixed-fee services
Planning package (measured survey + planning drawings): from £1,450 + VAT
If suitable existing survey/planning drawings are provided: reduced price from £950 + VAT
Building Regulations package (measured survey + Building Regulations drawings): from £1,450 + VAT
If suitable existing drawings are provided: reduced price from £950 + VAT
Complete package (measured survey + planning + Building Regulations): from £1,950 + VAT
If suitable existing drawings are provided: reduced price from £1,450 + VAT
Our detailed packages are prepared for both Building Control and your builder, with clear construction details, written specifications and structural coordination.
View services and pricesStructural calculations from £950 + VAT. They are additional to the Draw & Plan drawing/package fees and are not included in package prices.
From survey to construction
The measured survey is a design appointment as well as an accurate record: your architectural designer visits the property, reviews the house, roof and accessible loft with you and discusses the proposed conversion before preparing the drawings.
Send the property address and tell us how you would like to use the loft.
Your architectural designer personally visits your property to carry out the measured survey, discuss your ideas and assess the proposed loft design in the context of the existing building.
We develop the layout, staircase, roof alterations, windows and external appearance.
We confirm the likely route and prepare the appropriate planning, Lawful Development Certificate or Prior Approval application.
We prepare the Building Regulations package and coordinate structural calculations where required.
Loft conversion types
Best for: Roofs with good existing height and usable space
Adds rooflights with limited change to the external roof form. Some proposals may fall within Permitted Development, but the property and design still need checking.
Best for: Creating practical headroom and floor area
A popular option for terraced and semi-detached homes. Some rear dormers may be permitted development; others need planning permission or another route.
Best for: End-of-terrace, semi-detached and detached houses with hipped roofs
Extends the sloping side roof to form a vertical gable and create more internal space, subject to the property and surrounding context.
Best for: Maximising space in urban and period properties
A substantial roof alteration that will usually require a full planning application.
Best for: Properties with a rear projection or outrigger
Can create space for more than one room but needs careful planning, structure and fire-safety coordination.
Is the loft suitable?
During the measured survey, your architectural designer reviews the existing roof, floor levels and accessible loft with you to establish which conversion type, layout and staircase arrangement may be practical.
Choose the right drawing package
Planning drawings and Building Regulations drawings are related but separate stages. The planning route deals with whether the proposal is acceptable in principle and how it will look; the technical package explains how the conversion will be built and checked.
Loft planning drawings show the proposed roof form, dormers, rooflights, elevations, materials and relationship with the existing house and neighbouring properties. Where the proposal may be lawful under permitted development rights, we can prepare drawings for a Lawful Development Certificate for a loft conversion. That is separate from planning permission and is not suitable for every property or proposal.
Explore Planning DrawingsThese drawings explain the new floor, beams, roof structure, staircase, fire protection, insulation, ventilation and construction details for Building Control and your builder. They are separate from planning drawings and may still be required when planning permission is not needed.
Explore Building Regulations DrawingsTechnical coordination
Most loft conversions require structural calculations for new floor joists, steel beams, supports and roof alterations. Structural calculations are additional and are not included in package prices. We coordinate the structural information with the drawings.
The technical package also coordinates the protected escape route, fire doors and alarms, staircase geometry and headroom, insulation, ventilation, sound reduction and other Building Regulations requirements.
Structural calculations from £950 + VAT. They are additional to the Draw & Plan drawing/package fees.
Indicative build costs
These 2025 estimates are a starting point only. Costs depend on roof complexity, structure, staircase alterations, internal specification and contractor pricing.
Residential loft specialists
Meet the architectural designer who will prepare your drawings during the measured survey. Discuss your ideas, ask questions and explore the proposed design together on site.
Helpful answers
Some loft conversions can be carried out under Permitted Development Rights, while others require planning permission. The route depends on the property, location, roof alteration, volume and previous development. Where a proposal may be permitted development, a Lawful Development Certificate can provide formal confirmation of lawfulness, but it is not the right route for every property or design.
A Lawful Development Certificate application uses drawings and supporting information to ask the local planning authority to confirm that a proposed or existing loft conversion is lawful. It is separate from a planning application and should not be assumed to apply to every loft conversion; the correct route depends on the property and proposal.
Yes, in most cases. Your architectural designer personally visits your property to record the existing house, roof form, floor levels and accessible loft space, discuss your ideas and assess which conversion design may work in the context.
A typical package includes existing and proposed floor plans, elevations, roof plans and sections. Building Regulations drawings add structural, fire-safety, stair, insulation, ventilation and construction details.
Yes. We can prepare, submit and manage a planning application, Lawful Development Certificate or Prior Approval application, depending on the project.
Usually, yes. Planning and Building Regulations are separate. A loft conversion must still meet requirements for structure, fire safety, stairs, insulation, ventilation and other technical matters.
Most loft conversions need structural calculations for new floor joists, beams, supports and roof alterations. We collaborate with a structural engineer who will visit the site to assess the existing structure. Structural calculations from £950 + VAT. They are additional to the Draw & Plan drawing/package fees and are not included in package prices; we coordinate the structural information with our drawings.
Our Building Regulations package includes the plans, sections, construction details and written specification needed to support construction. It should be read with the engineer’s calculations and Building Control instructions.
The planning package, including a personal site visit by your architectural designer to carry out the measured survey and discuss the proposed conversion, starts from £1,450 + VAT. If suitable existing survey or planning drawings are provided, the reduced price starts from £950 + VAT. The Building Regulations package, including a personal site visit by your architectural designer to carry out the measured survey and discuss the proposed conversion, also starts from £1,450 + VAT, with a reduced price from £950 + VAT where suitable existing drawings are provided. The complete measured survey + planning + Building Regulations package starts from £1,950 + VAT, reduced to £1,450 + VAT where suitable existing drawings are provided. Structural calculations are additional.
Ready to convert your loft?
Tell us about your property and how you would like to use the roof space. We'll reply with a clear fixed-fee quotation.
