Loft boarding vs full conversion — know which you need
Simple boarding over existing insulation for storage is a small, quick job. A full conversion into a bedroom or office is a structural building project needing Building Regulations, new floor joists, insulation, staircase and fire safety measures — a completely different scale of work and cost from boarding.
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.
How long does a loft conversion take?
Simple boarding and insulation can be done in a day or two. A full loft conversion, including structural work, staircase, and fitting out, commonly takes 6-10 weeks depending on conversion type and complexity — dormer and mansard conversions typically take longer than a rooflight-only conversion.
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.
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.
Overlooking and privacy considerations for dormers
A dormer window, particularly on a side elevation close to a neighbouring property, can raise overlooking concerns that affect planning permission even within otherwise permitted development limits — obscure glazing or careful window positioning sometimes resolves this without needing a design change.
The structural engineer's role in a loft conversion
A structural engineer calculates the new floor joist sizing and any additional support needed, and their calculations are submitted as part of the Building Regulations application — this is a distinct professional role from the loft specialist doing the physical building work, sometimes provided in-house, sometimes brought in separately.
Do you need planning permission for a loft conversion?
Many loft conversions fall under permitted development and don't need full planning permission, but there are volume limits (typically 40-50 cubic metres depending on house type) and rules around dormers facing the road, roof height increases, and materials matching the existing house. Listed buildings and conservation areas have tighter restrictions.