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.
Reserve space for the everyday garden-to-kitchen transition in an addition.
Which trade-off matters?
A more generous back-door zone may require a smaller kitchen arrangement. Compare the clear space and storage each option provides before fixing the external wall.
What the drawing needs to explain
Draw a section with internal floor, threshold, outside level and drainage. Add a plan showing door movement, shoe storage and everyday access.
Decide this before construction
Fix levels and drainage before ordering flooring and the door. Plan a temporary rear exit if the existing kitchen remains in use.
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.