How many quotes should you get?
Three is reasonable for a loft conversion. Make sure each quote covers the same conversion type and includes (or clearly excludes) Building Regulations fees and structural engineer costs, since these are sometimes quoted separately and can make quotes look more different than they actually are.
Common loft conversion myths, busted
"Any loft can be converted" — roof pitch, height and structure all affect feasibility; not every loft has enough headroom. "Planning permission is always needed" — often not, if within permitted development limits. "It's just adding a floor and a window" — the structural, fire safety and staircase requirements are far more involved than that.
How much value does a loft conversion add?
A well-executed loft conversion commonly adds meaningful value to a property, though the exact amount varies significantly by area, property type, and how the new space compares to local expectations (an added bedroom typically adds more value than an office, for example) — worth researching comparable local sales rather than assuming a fixed percentage.
What a good loft conversion quote should include
A proper quote should specify conversion type, whether Building Regulations and any planning application costs are included, staircase design, insulation spec, and what happens if the roof structure needs more work than initially assessed once it's opened up.
What affects the cost
Cost depends heavily on conversion type (rooflight/Velux conversion is cheapest, dormer adds more space and cost, a full mansard is the most involved), whether a new staircase needs significant space reconfiguration below, and whether the existing roof structure needs strengthening. A simple boarding-and-insulation job is a fraction of a full conversion's cost.
Building Regulations and loft conversions
A full loft conversion into habitable space needs Building Regulations sign-off covering structural strength (new floor joists), fire safety (escape routes, fire doors), staircase access, insulation and ventilation. This isn't optional — it's checked when you sell the property and affects insurance and mortgage validity if skipped.
Loft conversions as a home office
A loft office needs the same Building Regulations compliance as a bedroom conversion if it's a permanent habitable room, plus good natural light and ventilation for comfortable working — worth planning window/rooflight placement around where a desk will actually sit, not just standard positioning.
Common loft specialist jobs
Loft specialists cover everything from simple boarding for storage, to insulation upgrades, to full loft conversions creating a new habitable room. It's worth checking which end of that range a specific company focuses on, since boarding/insulation and full structural conversions are quite different scopes of work.