Structural Calculations in London
Professional structural calculations for extensions, loft conversions and wall removals in London – beam designs and load assessments prepared for Building Control, typically within 3–5 days, for projects across all 32 London boroughs.
What are Structural Calculations?
Structural calculations are detailed reports produced by a structural engineer that specify the materials, sizes, and support types needed for a building project.
- Ensures Stability: They provide the exact specifications for beams (RSJs), foundations, and joists to ensure the building can support all loads.
- Building Control Requirement: These calculations are often required for Building Control submission in the UK.
- Technical Accuracy: Unlike general design, these are based on precise physics and engineering standards to prevent future structural failure.
- Investment Protection: They help identify structural risks early, so issues can be addressed before construction.
What to send for a quote: existing and proposed plans, sections, elevations, and photos or a description of the work.
When You Need Structural Calculations
You typically require professional engineering reports when your project involves structural modifications, such as:
- New Extensions: Designing the foundations and timber or steel frameworks for rear or side additions.
- Internal Wall Removal: Calculating the size of the steel beam (RSJ) required to support the floor or roof above.
- Loft Conversions: Determining how the existing roof and floor need to be reinforced to support the new living space.
- Chimney Breast Removal: Ensuring the remaining chimney stack is properly supported.
Our Structural Calculation Engineering Process
We provide a streamlined service that combines technical expertise with deep knowledge of construction standards.
Structural Assessment
Send your existing and proposed plans, sections, elevations and photos for review. We review your architectural plans to identify the necessary structural interventions, confirm what calculations are needed, and agree the fee and timescale.
Detailed Calculations
We produce a comprehensive report including beam sizing, load analysis, and connection details.
Technical Drawings
You receive professionally prepared structural layouts that builders can follow on-site.
Liaison with Building Control
We provide the necessary documentation to support your Building Control submission and respond to any queries raised.
Why Choose Online Architectural Services
Navigate London’s planning regulations with confidence. Our experienced team handles all aspects of planning applications.
London Borough Experience
Deep knowledge of all 32 London boroughs and their specific planning requirements.
Structural Experience
Engineer-prepared calculations for extensions, loft conversions and structural alterations across London.
Council-Compliant Drawings
Professional architectural drawings prepared to meet local authority requirements.
Clear Pricing
Quote-based pricing, confirmed before work starts, with the scope agreed in advance
Fast Turnaround
Calculations prepared within 3–5 days, planned to meet your project timelines.
Related Services
Building Regulation Drawings
Compliant technical drawings for building control approval.
Frequently Asked Questions - Structural Calculations
Are they the same as architectural drawings?
No. Architectural drawings show layout and appearance; structural calculations show sizes, loads and support needed to make that design stand up safely.
Why do I need them for an internal wall removal?
If the wall is load-bearing, calculations are usually needed to size the replacement beam and confirm the remaining structure can support it.
Does Building Control need to see them?
In most cases, yes. They are usually submitted with a Building Regulations application.
How long does the process take?
Typically 3–5 days, depending on the complexity of the project and whether architectural drawings are already available.
Can you work from my architect’s drawings?
Yes, in most cases. Send existing and proposed plans, sections and elevations.
What’s included in a calculations package?
Beam sizing and load analysis, connection details and structural drawings where required, and responses to Building Control queries. Padstone and bearing design and goalpost frames where needed.
Are structural calculations needed for planning permission?
No, in most cases. Calculations are for Building Regulations; the exception is a basement, where engineering can form part of the planning case.