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 (sondering), to structural calculations, technical drawings and construction support. Clear, traceable and contractor-friendly—especially for complex urban renovations 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 + 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, what risks exist, and how the scope can be optimized.
- Wall removals (load-bearing vs non-load-bearing)
- Extra floors / attic upgrades
- Extensions and “glass box” rear façades
Soil Investigation Coordination (Sondering)
Organizing cone penetration tests and interpreting results for foundation design—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 required for your municipality and contractor, reducing delays and follow-up questions.
- Permit-ready technical narrative
- Clear deliverables list and assumptions sheet
- Construction-phase checkpoints
2. Calculations (Constructieberekeningen)
Steel Beam Calculations (Staalberekening)
Exact sizing of steel beams (HEA/HEB/IPE) for wall removals, lintels, and large openings—based on load paths and supports.
- Beams, columns, padstones / bearings
- 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 / slab solutions
- Pile foundations + pile load distribution
- Settlement risk and differential movement
Roof & Floor Load Calculations
Checking if existing floors/roofs can carry new loads (bath, underfloor heating, roof terrace) and designing reinforcements.
- Timber/steel/concrete floor checks
- Strength and deflection verification
- Strengthening proposals where needed
Dormer & Loft Conversion Engineering
Engineering for dormers (“dakkapellen”) and attic upgrades, including new floor structures and stability.
- Dormer framing and load transfer
- Attic floor upgrades
- Integration with existing rafters/joists
Wind & Stability Analysis
Ensuring the building remains stable against wind loads, particularly for taller extensions or open-plan rear façades.
- Stability elements and bracing logic
- Load path continuity
- Checks for “open-plan” interventions
3. Technical Drawings (Constructietekeningen)
Formwork & Reinforcement Plans
Detailed concrete drawings (bekisting- en wapeningsplannen) showing dimensions and reinforcement placement.
- Rebar layout, laps, cover requirements
- Concrete sections, dimensions, notes
- Execution clarity for 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: steel-to-masonry, timber hangers, bearing details, and interfaces between new and existing structure.
- Bearings, plates, anchors
- Timber joist hangers and support notes
- Typical details to avoid site confusion
Building Permit Dossier (Omgevingsvergunning)
Compilation of structural documents suitable for authority review, aligned with municipality requirements.
- Calculation report + assumptions sheet
- Structural drawings set
- Support with technical questions when 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 (risk-controlled)
- Structural checks and detailing
- Interface with existing foundations
Historic Preservation Engineering
Structural advice for monuments (“monumenten”) using sympathetic materials and careful detailing.
- Compatible detailing approach
- Risk management for old masonry/timber
- Coordination for 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/purlin capacity verification
- Reinforcement concept if required
5. Construction Support (During Build)
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, permit dossier) and provide a clear quotation.
Insulindeweg 649, 1095EA Amsterdam • The Netherlands