Rooftop addition · calculationFrom €761.09 incl. VAT€629.00 excl. VATWhat is assessed?
An extra layer adds weight and wind load. That is why the structural engineer looks beyond the roof: the entire bearing route to the foundation is relevant. A light build-up can have advantages, but still needs to be calculated.
Existing drawings do not always reflect the actual situation. A recording or additional investigation may be necessary before the design is determined.
What data is needed?
The following information can be used to prepare the assessment. The structural engineer determines whether additional research is necessary.
- Existing construction and foundation drawings
- Preliminary design of the additional storey
- Desired facade and roof materials
- Photos and available research reports
What do you receive?
Record the exact delivery in the quotation. Depending on your project and assignment, this involves:
- Assessment of existing supporting structure within the assignment
- Calculation of the structure
- Reinforcement advice where necessary
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?
An additional storey starts with the capacity of the house below. Explicitly include assessment of existing walls, floors and foundations. Compare material options early: a different construction may require different strengthening and connection details.
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 construction and foundation drawings | Gather the most recent available data and identify what is missing. |
| Preliminary design of the additional storey | Gather the most recent available data and identify what is missing. |
| Desired facade and roof materials | Gather the most recent available data and identify what is missing. |
| Photos and available research reports | Gather the most recent available data and identify what is missing. |
- Describe your complete construction plan.
Use the space above your home. First investigate what the existing floors, walls and foundation can support.
- 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 roof construction
Is a light roof structure always possible?
A low net weight can be beneficial, but is not an automatic confirmation. Use load, wind, connections, stability and the existing carrying route are also relevant. The structural engineer must determine what information about the home and foundation is required to assess the design.
Which drawings are needed for a roof structure?
Collect the new design and available drawings of the existing foundation, floors, load-bearing walls and roof. Add information about previous breakthroughs and renovations. Indicate which data is missing. The structural engineer then determines whether recording or additional research is necessary.
Should the new stairs also be included?
A new stair opening can change the floor and surrounding structure. Therefore, share the stair location, desired opening and floor heights at the same time as the design of the structure. Determine who calculates the opening and who coordinates the dimensions with the stair supplier.
What if the existing home needs to be reinforced?
Ask which reinforcements are being developed within the assignment and what additional information is required for this. Discuss the consequences for layout, finishing, implementation and budget. Include the chosen solution in the current drawings before ordering the structure or required parts.
Related constructive topics
- Roofs and roof extensions
- Foundations and earth retaining structures
- Complete buildings and transformations
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.