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.
Include intended interior details in the design of additional space.
Which trade-off matters?
A minimal joint or concealed fixing may need extra coordination. Compare the intended appearance with tolerances, maintenance and replaceability before treating a detail as straightforward.
What the drawing needs to explain
Draw one bespoke junction at a large scale with every adjoining finish layer. Identify who takes final dimensions and which substrate must be ready for that measurement.
Decide this before construction
Approve material combinations and the sample detail before production. Complete work affecting dimensions before ordering final bespoke components.
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.