STEP 01
Your plans
Tell us what you want to change and the space you want to create.
Home/House extension process
From enquiry to follow-up support
House extension process
Extra living space with a structure designed to connect to your existing home.
Key considerations for your house extension
The new foundations, roof and any opening in the rear wall form one design. Differences in movement between the existing house and extension need attention. A rooflight, green roof or roof terrace changes the design basis.
Start with the right documents
- Existing and proposed floor plans
- Section and roof build-up
- Available ground investigation and foundation information
- Plans for the external wall opening and rooflight
STEP 02
Drawings and photos
Share what you have. We identify any missing documents.
STEP 03
Assessing the information
The available documents are compared with the question to be assessed.
STEP 04
Establishing the design basis
Loads, materials, supports and the scope of the work are recorded.
STEP 05
Calculations and drawings
The agreed structural design is developed into a report and drawings.
STEP 06
Internal review
The design basis, consistency and detailed work are checked.
STEP 07
Receiving your documents
You receive the agreed project documents with a clear revision status.
STEP 08
Coordinating with your contractor
Your contractor uses the final documents and raises any discrepancies before proceeding.
STEP 09
Any permit application
Where applicable, you use the documents in the permit process.
STEP 10
Questions and follow-up support
Questions about our calculations are handled under the agreed support and guarantee terms.
What to coordinate before construction
Check that everyone is using the final revision. Arrange temporary works, the construction sequence and required permissions in advance. Discrepancies in the existing building or design changes may require reassessment.
View the full service and scopeA structural plan.
Clear answers to follow-up questions.
If the municipality requests additional structural information about our calculations within the original brief, we provide that information within the agreed scope at no additional professional fee.
The municipality makes the permit decision.