What this work involves
An extra storey changes more than the roof. The existing structure, staircase position, escape arrangements and installation routes need to be considered together. Establish what the building can support before settling the design.
- Existing structure and foundation assessment
- Stair opening and usable room layout
- Roof shape and neighbouring buildings
- Facade materials, windows and insulation
- Lifting, scaffolding and temporary weather protection
Use the following design considerations when coordinating this service with a wider project. Agree which parts apply to your request.
Relate a new room to existing doors and interior proportions.
Which trade-off matters?
Making every surface perfectly uniform can remove recognisable details. Compare local repairs with full renewal and agree where small dimensional differences may deliberately remain visible.
What the drawing needs to explain
Prepare a detail sheet for the door, frame, skirting and wall together. Identify retained elements, refinished surfaces and locations requiring bespoke work.
Decide this before construction
Dismantle retained elements only with an agreed recording and storage plan. Take final bespoke measurements after assessing the adjoining substrate.
Cost factors for this service
Include design, investigations, structural work, the new envelope and internal finishes. Additional strengthening can change the budget.
Bring this to the discussion
Existing plans, photographs of roof and facades, intended rooms and information about earlier alterations.
Questions about the work
Is every flat roof suitable for another floor?
No. The building, its foundation and the rules for the property are decisive. Structural assessment and a location-specific permit check belong in the preparation.
The design situations here illustrate choices; they are not completed projects or a diagnosis of your property.