Extensions and lofts · Planning to handover
Extensions and lofts in London.
Rear, side return and wraparound extensions, dormer lofts and mansards, from feasibility to handover.
01What it covers
Extensions and lofts, explained.
We take an extension or a loft from feasibility to handover. Planning, architecture, structural design and cost planning happen first. Construction follows under the same contract.
Traditional and modular routes are both assessed, then we tell you which suits. Most rear extensions also change the existing ground floor. We price the new area and the reworked rooms separately.
A dormer or a mansard changes the roof in different ways. We choose the approach through design and planning review. Headroom, stairs and light are tested before the design is fixed.
- Rear, side return and wraparound extensions
- Dormer lofts and mansards
- Feasibility, planning and structural design in one team
- New area and existing rooms priced separately
- Traditional or modular construction, assessed for your site
- Construction and interior fit-out in one contract
02Our own photograph
Seen on site.
03Built by us
Extensions and lofts, delivered.
04Part of one contract
Part of our extensions and lofts service.
06 · Planning to handover
Extensions and lofts
Rear, side return and wraparound extensions, dormer lofts and mansards.
See the whole serviceQuestionsExtensions and lofts, answered
What people ask about extensions and lofts.
Is a side-return extension right for my house?
We test the gain in usable width against daylight, circulation and garden access. Extending to the boundary is not always the right answer for every home.
Can I build a rear or double-storey extension?
The answer depends on planning context, property size, neighbour effects and structural feasibility.
We test a two-storey addition as one whole building. This includes how the new upstairs rooms connect.
Is there enough headroom for a loft conversion?
A measured section tests usable standing height, floor buildup, insulation and stair arrival. Roof height alone does not tell you how useful the finished room will be.
What is the difference between a dormer and a mansard?
They create roof accommodation in different ways and change the external form differently. We choose the roof approach through design and planning review, not just floor area.
Will a loft conversion require changes below the roof?
It may affect stairs, ceilings, service routes and the fire strategy on existing floors. We include those changes in the scope and programme from the outset.
Next step
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From the journal402 notes, free to read
Extensions and lofts, written up.
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2 min read
Loft conversion staircase and headroom explained
Where the loft staircase goes decides the floor below. Headroom, the measured section, dormer or mansard, and what a London loft conversion costs to build.
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3 min read
Planning permission for a London extension: timing and refusals
A decision date is not a start date. What sits either side of the council decision, plus pre-application advice and refusals.
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4 min read
Side return or rear extension? Cost and how to choose
Side return or rear extension for a London terrace? What each one is, what moves the cost of each, and how a design and build contractor chooses.
Extensions and lofts
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