Structural calculationPrice on requestWhat is assessed?
An extra floor above an extension requires an assessment of the entire existing system. This concerns the roof or floor, the walls and the foundation.
The fact that an extension is still new does not indicate whether it was designed for a floor above it. Collect the original calculation and have the new plan assessed accordingly.
What data is needed?
The following information can be used to prepare the assessment. The structural engineer determines whether additional research is necessary.
- Existing extension drawings and calculations
- Foundation records
- Superstructure design
- Desired materials
What do you receive?
Record the exact delivery in the quotation. Depending on your project and assignment, this involves:
- Assessment of existing extension
- Calculation of new structure
- Possible reinforcement effect
Discuss who will take care of the architectural development, supplier details and any temporary support. In this way, the components involved are coordinated.
Materials and drawings
The choice of materials and connections follow from the design. Read more about Structural timber and the difference between a architectural drawing and a construction drawing.
How does the process proceed?
You describe your project and share the available data. The assignment, any additional information and planning are then coordinated. Check it out complete step-by-step plan for all phases.
What does your assignment cover?
First establish the loads for which the existing extension was designed. Original calculations may show assumed reserve capacity, but must be checked against the new plan. Discuss possible wall and foundation strengthening before developing the design further.
Can I already order material?
Order structural parts based on the coordinated and current design data. A preliminary estimate is not a complete basis for this.
Is a site visit necessary?
That depends on the project and the available information. Sometimes drawings and photos are sufficient for the inventory; sometimes an admission or additional examination is necessary.
What happens if my plan changes?
Report changes before they are implemented. The structural engineer assesses whether calculations and drawings need to be adjusted.
From data to a detailed plan
Checklist for your application
| Given | What you prepare |
|---|---|
| Existing extension drawings and calculations | Gather the most recent available data and identify what is missing. |
| Foundation records | Gather the most recent available data and identify what is missing. |
| Superstructure design | Gather the most recent available data and identify what is missing. |
| Desired materials | Gather the most recent available data and identify what is missing. |
- Describe your complete construction plan.
Investigate whether the existing extension is prepared for an extra floor.
- Discuss missing data.
The structural engineer determines which recording or additional information is required for the agreed assessment.
- Record order and delivery.
Agree on the calculated parts, drawings, price and planning.
- Match the effect to the implementation.
Use the current documents and have relevant changes reviewed before they are implemented.
Frequently asked questions about construction on an extension
Is an existing extension prepared for a floor?
This is not only evident from age or appearance. Find the original design and check which principles have been laid down for the foundation and superstructure. The structural engineer assesses what information is required for the new situation.
What if the old calculation is missing?
Collect the available construction drawings, details of the contractor and photos. State what remains unknown and ask what admission or investigations are necessary. An absent report cannot be replaced by an assumption that a comparable extension is the same.
Related constructive topics
Your project location
Provide the building address and share available drawings and photographs. Discuss whether a site survey is needed and which travel or investigation costs form part of the commission.