Thinking of converting your loft? This complete guide covers types of loft conversion, planning requirements, costs, and what to expect from the build process.
A loft conversion is one of the most cost-effective ways to add living space and value to your home. For homeowners in the North West, where period terraces and semis dominate much of the housing stock, a well-executed loft conversion can transform a cramped home into a spacious one without the upheaval of moving.
Types of Loft Conversion
The type of loft conversion that's right for you depends on your property type, roof structure, and budget.
Velux/Rooflight Conversion — The simplest and most affordable option. Velux windows are installed into the existing roof slope without altering the roofline. Suitable for properties with sufficient head height (ideally 2.2m or more at the ridge).
Dormer Conversion — A structural extension projects outward from the existing roof slope, creating a box-shaped dormer with vertical walls. This dramatically increases usable floor space and head height. The most popular choice for terraced and semi-detached homes across Cheshire and Greater Manchester.
Hip-to-Gable Conversion — Suited to detached and semi-detached properties with a hipped roof. One or both hipped ends are converted to vertical gable walls, increasing internal volume significantly.
Mansard Conversion — The most extensive type, involving a near-vertical rear wall and flat or near-flat roof. Creates maximum space but requires full planning permission and is the most expensive option.
Planning Permission
Many loft conversions fall under Permitted Development rights, meaning no formal planning permission is required — provided certain conditions are met. These typically include limits on the volume of the addition (40 cubic metres for terraced houses, 50 for detached/semi-detached), restrictions on height, and materials matching the existing roof.
Conservation areas, listed buildings, and some local authority restrictions may affect what you can do. Our team has extensive experience navigating planning requirements across Cheshire, Manchester, Liverpool, and beyond.
What Does a Loft Conversion Cost?
Costs in the North West typically range from £25,000 for a basic Velux conversion to £60,000+ for a full Mansard. A dormer conversion for a typical semi-detached property usually falls in the £35,000–£50,000 range, depending on specification and finish.
The Build Process
A standard loft conversion project with OneSource follows these stages: structural survey and design, planning/building regulations application, installation of steel beams, floor joists, and structural work, roofing and waterproofing, dormer construction (if applicable), first fix electrics and plumbing, insulation, plastering, second fix, staircase installation, and final decoration.
Talk to OneSource
Our building and construction team manages loft conversions across the North West. Call us on 07708 415087 for a free consultation and quotation.
Need Help With Your Project?
OneSource Property Solutions provides expert property services across Cheshire and the North West. Get a free, no-obligation quote.