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Transform your unused loft into a stunning bedroom, home office or playroom. Our architectural designers produce planning drawings and building regulation drawings prepared for Building Notice submission, with structural calculations by an independent qualified structural engineer, for loft conversions across Hampshire.
Have a hipped roof? Read about hip-to-gable loft conversion design.
Room to grow
Unlock the potential above your existing home.
How much will your loft conversion cost? And will you need planning?
Start your free Feasibility CheckThe right type depends on your roof shape, head height, budget and planning constraints. We'll advise you during your Free Feasibility Study.
The most affordable option — internal conversion with roof windows. No external alterations to the roofline, making it ideal where permitted development rights apply.
Best for: Homes with good existing head height
The most popular type in Hampshire. A box-shaped extension projects from the rear roof slope, creating full standing height and usable floor space across the loft.
Best for: Most family homes needing extra bedrooms
Converts the sloping hip end of a roof into a vertical gable wall, dramatically increasing the internal loft space. Often combined with a rear dormer.
Best for: Semi-detached and detached homes with hipped roofs
A substantial roof alteration with a steep wall and flatter roof above. Assess usable space, structure and the street scene; planning permission is generally required.
Best for: Properties needing maximum space, period homes
Not every loft can be converted. Here's what we check during your complimentary feasibility assessment.
Minimum 2.2m from floor joist to ridge is ideal. Less than this and a dormer or mansard may be needed.
Traditional cut timber roofs are easier to convert. Trussed roofs need input from a qualified structural engineer.
You need space for a compliant staircase — often taken from a landing or small bedroom.
Central chimney breasts, water tanks and boiler flues may need relocating.
Many rear dormers and Velux conversions fall under PD rights — no planning application needed. Volume limits apply: 40m³ for terraced houses, 50m³ for detached/semi-detached.
Front-facing dormers and mansard alterations generally need a planning application. A hip-to-gable conversion may qualify for permitted development if all conditions are met. Conservation areas, listed buildings and Article 4 Directions need property-specific checks.
Every loft conversion needs building regulations approval covering: structural integrity, fire escape routes, sound insulation, thermal insulation, staircase design and means of escape.
Fire Safety: Loft conversions create a 3-storey dwelling. Building regs require protected escape routes, fire doors, smoke detection and sometimes mains-powered interlinked alarms.
Design packages start from £1,950 + VAT.
Includes planning drawings, building regulation drawings prepared for Building Notice submission and structural calculations by an independent qualified structural engineer
Compare written scopes, exclusions and VAT treatment before appointing a contractor.
Our package fees are Pre-Build £1,950 + VAT, Premium £2,950 + VAT and Premium Plus £3,950 + VAT. Compare the packages page for scope.
Many loft conversions qualify under Permitted Development rights, provided they meet volume limits (40m³ for terraced, 50m³ for detached/semi-detached). Dormers facing a highway, conservation areas, or exceeding the existing roof height usually require planning permission.
Compare dormer, hip-to-gable, mansard and Velux/rooflight options. The appropriate type depends on roof structure, usable headroom, stair access, daylight and planning restrictions.
Your measured survey is booked within 10 working days of your deposit. Your first drawings follow within 15 working days of the survey.
Headroom, roof pitch, stair access, fire escape and the existing structure need assessment. Structural calculations are prepared by an independent qualified structural engineer. The suitable layout depends on the actual house and roof.
Dormer Loft Conversion Design
Roof design, planning checks and fixed-fee drawing packages
Free Feasibility Study
Get your complimentary feasibility summary for your loft conversion
Extension Design Service
Fixed-fee planning drawings and building regs
Party Wall Notice Guide
Party wall requirements for loft conversions
Our Pre-Build Packages
Fixed-fee packages from £1,950 + VAT
Start your Free Feasibility Study. We'll assess your loft's suitability, advise on the best conversion type and provide a clear design fee quote.
Period roofs, conservation areas and listed buildings need careful consideration of dormer position, materials and the street scene. Check the property's planning history and any Article 4 Directions with Winchester City Council. Loft and extension design in Winchester.
For a hipped roof, compare a hip-to-gable arrangement with a rear dormer; establish headroom, stair access and structure before choosing a layout. Basingstoke and Deane Borough Council is the local planning authority; conservation areas and planning conditions can affect permitted development. Loft and extension design in Basingstoke.
Terraced properties may benefit from a rear dormer, while rooflights can suit an existing roof with usable headroom. Stair access and fire escape need coordination with the existing house. Check local restrictions with Southampton City Council. Loft and extension design in Southampton.
Hipped roofs need a property-specific comparison of hip-to-gable and dormer options. Test Valley Borough Council deals with planning applications in Andover; rural settings, conservation areas and planning history may affect the proposal. Loft and extension design in Andover.
How much will your loft conversion cost? And will you need planning?
Start your free Feasibility Check
