What this work involves
Start with the space you need in daily life. Place furniture and walking routes on the plan before deciding the external dimensions. A deeper extension is not automatically better: daylight in the existing part deserves equal attention.
- Dimensions and position of the extension
- Existing rear wall and structural changes
- Foundation, floor build-up and connection to the house
- Glazing, rooflights, shading and ventilation
- Kitchen, heating and electrical layout
Use the following design considerations when coordinating this service with a wider project. Agree which parts apply to your request.
Include an addition in a complete logistics and protection plan.
Which trade-off matters?
Running many trades simultaneously can appear to save time but increases pressure on access and working space. Compare parallel work with a deliberate sequence by building section.
What the drawing needs to explain
Combine the design plan with logistics for storage, deliveries and protected zones. Identify who approves each interface before the next stage begins.
Decide this before construction
Use release points between work sections: design complete, substrate assessed, concealed work recorded and finishes ready. The next party starts from an agreed condition.
Cost factors for this service
Size, foundation method, access, structural work and finishes determine the budget. Ask for drawings, installations, demolition and garden reinstatement to be identified separately.
Bring this to the discussion
A floor plan, photographs, approximate dimensions and a short list of requirements.
Questions about the work
Can I stay at home during the extension?
It depends on the work. Discuss when the existing wall is opened, how the house is protected from dust and rain, and which facilities become unavailable.
The design situations here illustrate choices; they are not completed projects or a diagnosis of your property.