Structural Survey • Calculations • Drawings • Permit Dossier • Site Support
Structural Calculations & Technical Drawings for Renovations, Extensions and Conversions
Aboss provides a municipality-ready structural package: from pre-construction assessment and soil investigation coordination, to structural calculations, technical drawings and construction support. Clear, traceable and contractor-friendly, especially for complex urban renovation projects in Amsterdam.
Typical scope: steel beams for wall removals, foundation checks for extensions, and permit-ready documentation.
1. Pre-Construction & Assessment
Structural Survey / Inspection
On-site assessment of the existing building to identify cracks, settlement indicators, moisture-related damage, or hidden structural risks before work starts.
- Visual inspection with photo documentation
- Risk signals: cracks, deflection, uneven floors, facade movement
- Practical advice for contractors and owners
Feasibility Advice
A clear engineering opinion on whether your plan is technically feasible, which risks exist, and how the scope can be optimized.
- Wall removals: load-bearing vs non-load-bearing
- Extra floors and attic upgrades
- Extensions and glazed rear facades
Soil Investigation Coordination
Organizing cone penetration tests and interpreting results for foundation design, which is critical in Dutch urban soils.
- Coordinate fieldwork and access logistics
- Interpret CPT results for bearing layers
- Input for foundation type selection
Scope Definition for Permit & Build
We define what documents are needed for municipality review and contractor execution, reducing delays and follow-up questions.
- Permit-ready technical narrative
- Clear deliverables list and assumptions sheet
- Construction-phase checkpoints
2. Structural Calculations
Steel Beam Calculations
Exact sizing of steel beams such as HEA, HEB or IPE profiles for wall removals, lintels and large openings, based on load paths and support conditions.
- Beams, columns and bearing points
- Deflection checks and serviceability
- Connection logic for contractor execution
Foundation Design
Calculations for strip foundations, slabs or piles, based on soil investigation results and project loads.
- Strip footing and slab solutions
- Pile foundations and load distribution
- Settlement risk and differential movement
Roof & Floor Load Calculations
Checking whether existing floors and roofs can carry new loads such as bathrooms, underfloor heating, roof terraces or added equipment.
- Timber, steel and concrete floor checks
- Strength and deflection verification
- Reinforcement proposals where needed
Dormer & Loft Conversion Engineering
Engineering for dormers and attic upgrades, including new floor structures and stability considerations.
- Dormer framing and load transfer
- Attic floor upgrades
- Integration with existing rafters and joists
Wind & Stability Analysis
Ensuring the building remains stable against wind loads, especially for taller extensions or open-plan rear facades.
- Stability elements and bracing logic
- Load path continuity
- Checks for open-plan interventions
3. Technical Drawings
Formwork & Reinforcement Plans
Detailed concrete drawings showing dimensions and reinforcement placement.
- Rebar layout, laps and cover requirements
- Concrete sections, dimensions and notes
- Execution clarity for the contractor
Structural Layout Drawings
Plans showing all load-bearing elements: beams, columns, walls and foundation geometry.
- Structural plans and sections
- Member tagging and dimensions
- Coordination with architectural drawings
Connection Details
Clear detail sketches for steel-to-masonry, timber supports, bearings and connections between new and existing structure.
- Bearings, plates and anchors
- Joist support notes
- Typical details to avoid site confusion
Building Permit Dossier
Compilation of structural documents suitable for authority review, aligned with municipality expectations.
- Calculation report and assumptions sheet
- Structural drawings set
- Support with technical questions where needed
4. Specialized Renovation Services
Wall Breakthrough Plans
Step-by-step technical instructions for safe temporary support and controlled removal of load-bearing walls.
- Temporary propping concept
- Sequence notes for contractor
- Beam installation and bearing details
Underpinning Design
Engineering solutions for basement deepening or stabilizing a sinking foundation, including phased execution logic.
- Phasing concept with controlled risk
- Structural checks and detailing
- Interface with existing foundations
Historic Preservation Engineering
Structural advice for monument buildings using sympathetic materials and careful detailing.
- Compatible detailing approach
- Risk management for old masonry and timber
- Coordination with permit constraints
Solar Panel Roof Checks
Verifying roof capacity for solar arrays and advising on reinforcement where needed.
- Dead load and wind uplift checks
- Rafter and purlin capacity verification
- Reinforcement concept if required
5. Construction Support
Site Inspections
On-site verification that steel, reinforcement and structural elements are installed as specified in the drawings.
- Checks for reinforcement placement
- Beam installation and bearings
- Practical feedback for contractor
Contractor Q&A
Technical support for unforeseen discoveries once the building is opened: fast, practical and solution-oriented.
- On-call engineering clarification
- Quick revisions when necessary
- Minimize delays on site
As-Built Drawings
Updating the drawing set to reflect changes made during construction, useful for future renovations and property documentation.
- Revised drawings after site changes
- Consolidated final record set
- Improved future maintainability
Contact Aboss
Send your project address, brief scope, sketches, photos and, if available, existing drawings. We will advise on the correct route: inspection, soil investigation, calculations, drawings, or permit dossier support, and provide a clear quotation.
Insulindeweg 649, 1095 EA Amsterdam • The Netherlands