Loft Conversions

Add valuable living space with a stylish, fully compliant loft conversion — dormer, hip-to-gable, mansard or roof-light — delivered across London.

NMSM loft conversion collage

More space, more value

Turn unused loft space into a bedroom, office, studio or ensuite. We manage structure, insulation, stairs, fire-safety and finishes — end to end.

Planning Made Simple

Guidance on permitted development and planning applications.

Smart Design

Stair placement, head height, rooflights/dormers and storage optimised.

Warm & Quiet

Modern insulation, acoustic upgrades and airtightness details.

Fast Build

Typical build window 6–8 weeks with weekly progress updates.

Popular loft types

Dormer

Rear or L-shaped dormers for extra headroom, usable floor area and large windows.

Hip-to-Gable

Extends a hipped roof into a full gable, gaining significant internal volume.

Mansard

Steeper rear roof with parapet walls — maximises space in urban terraces.

Roof-Light (Velux)

Most economical option — convert with roof windows, minimal structural change.

What’s included

  • Surveys, structural design (RSJs), party wall coordination
  • Dormer/structural carpentry, steelwork and roofing
  • Staircase design & installation, fire-safety upgrades
  • Insulation, vapour control, plasterboarding & plastering
  • First/second fix electrics & plumbing, radiators/UFH
  • Windows, roof-lights, doors and internal joinery
  • Bathrooms/ensuites, tiling, flooring & decorations
  • Sign-off: Building Control, Part P, Gas Safe (via partners)

How a loft conversion runs

1

Survey & Quote

Measure up, check head height and structure, and issue an itemised quote.

2

Design & Permissions

Architectural details, structural calcs, party wall and planning (if required).

3

Build Phase

Openings, steels, dormers/roof-lights, stairs, MEP and finishes.

4

Sign-off & Handover

Final QA, certificates, warranties and clean handover.

Typical build: 6–8 weeks on site after design approvals.

Recent Loft Projects

A snapshot of our loft conversion work across Greater London.

See all loft projects

Loft Conversion – FAQs

Do I need planning permission?

Many lofts fall under permitted development, but conservation areas or mansards may require planning. We’ll advise and handle submissions if needed.

What minimum head height do I need?

Ideally around 2.2–2.3m before construction. We’ll confirm during survey and propose solutions if marginal.

How do you ensure fire safety?

Protected staircase routes, FD30 fire doors (or mitigation), mains-linked smoke alarms and compliant escape windows as required.

Can you add an ensuite?

Yes — we’ll plan plumbing runs, ventilation and drainage falls during design to suit your layout.

Ready to convert your loft?

Tell us about your plans — we’ll provide a clear, no-obligation quote.