Rooflight loft conversion
Best for: Roofs with good existing height and usable space
Adds rooflights with limited change to the external roof form and may fall within Permitted Development.
⭐ Rated 4.9 on Google · Since 2014 · 1,000+ projects completed
Loft Conversion Drawings London from £950 + VAT
Loft conversion drawings show how an unused roof space can become a safe, practical new bedroom, office or bathroom. Draw & Plan prepares planning drawings, Building Regulations drawings and construction details for homeowners converting lofts across Greater London.
We design rooflight, dormer, hip-to-gable, mansard and L-shaped loft conversions, with fixed-fee quotations and application management across all London boroughs.
Complete drawing package
What's included
A coordinated package for the council, Building Control, structural engineer and builder.
- Measured survey of the house and roof space
- Existing and proposed floor plans
- Existing and proposed elevations
- Roof plans and conversion sections
- Staircase position and headroom
- Dormer, rooflight and roof-form details
- Fire-safety and escape information
- Insulation and ventilation details
- Coordination with a structural engineer
- Planning and Building Control submission support
Fixed-fee services
Clear pricing before work begins
Planning drawings: from £1,250
Building Regulations drawings: from £950 + VAT
Planning + Building Regulations: from £1,650 + VAT, including the measured survey.
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 design packages from our affiliated structural engineer start from £595 (no VAT) for a simple loft conversion.
From survey to construction
Our loft conversion drawing process
We normally begin with a Measured Building Survey to record the house, roof and accessible loft before design work starts.
- 01
Fixed-fee quote
Send the property address and tell us how you would like to use the loft.
- 02
Measured survey
We record the house, roof form, floor levels and accessible loft space. At the same time your designer will discuss your proposal on site.
- 03
Loft design
We develop the layout, staircase, roof alterations, windows and external appearance.
- 04
Planning route
We prepare and manage the appropriate planning, Lawful Development or Prior Approval application.
- 05
Technical drawings
We prepare the Building Regulations package and coordinate structural calculations where required.
Loft conversion types
Common loft conversions we design
Rear dormer conversion
Best for: Creating practical headroom and floor area
A popular option for terraced and semi-detached homes, subject to design and planning constraints.
Hip-to-gable conversion
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.
Mansard conversion
Best for: Maximising space in urban and period properties
A substantial roof alteration that will usually require a full planning application.
L-shaped dormer
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?
Five things we check
A measured survey helps establish which conversion type, layout and staircase arrangement may be practical before the proposed drawings are prepared.
Two different drawing stages
Planning Drawings vs Building Regulations Drawings
Planning Drawings
Show the proposed roof form, dormers, rooflights, elevations, materials and relationship with the existing house and neighbouring properties.
Explore Planning DrawingsBuilding Regulations Drawings
Explain the new floor, beams, roof structure, staircase, fire protection, insulation, ventilation and construction details.
Explore Building Regulations DrawingsTechnical coordination
Structure, fire safety and Building Control
Most loft conversions require structural calculations for new floor joists, steel beams, supports and roof alterations. These are provided separately by our affiliated structural engineer and coordinated with our 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.
Our affiliated structural engineer charges:
- Load-bearing wall removalfrom £225
- Single-storey extensionfrom £395
- Two-storey extensionfrom £495
- Loft conversionfrom £595
No VAT is added.
Example drawing set
Sample loft conversion drawings
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.
Indicative build costs
What might a loft conversion cost?
These 2025 estimates are a starting point only. Costs depend on roof complexity, structure, staircase alterations, internal specification and contractor pricing.
Residential loft specialists
Why homeowners choose Draw & Plan
Since 2014Residential drawing specialists
1,000+Projects completed
4.9★Google rating
London-wideAll London boroughs covered
Helpful answers
Loft Conversion Drawings FAQs
Do I need planning permission for a loft conversion?
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.
Do I need a measured survey first?
Yes, in most cases. The survey records the existing house, roof form, floor levels and accessible loft space used as the base for the conversion design.
What drawings are needed for a loft conversion?
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.
Can you submit the planning application?
Yes. We can prepare, submit and manage a planning application, Lawful Development Certificate or Prior Approval application, depending on the project.
Do I need Building Regulations drawings if planning permission is not required?
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.
Will I need structural calculations?
Most loft conversions need structural calculations for new floor joists, beams, supports and roof alterations. These are provided separately by our affiliated structural engineer from £595, with no VAT added, and coordinated with our drawings.
Can my builder use the 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.
How much do loft conversion drawings cost?
Planning drawings start from £1,250. Building Regulations drawings start from £950 + VAT. Combined planning and Building Regulations packages start from £1,650 + VAT, with the fixed fee confirmed before work begins.
Ready to convert your loft?
Get loft conversion drawings from £950 + VAT.
Tell us about your property and how you would like to use the roof space. We'll reply with a clear fixed-fee quotation.