Extension & loft conversion (Richmond, Southwest London)
The structural calculations behind this project, prepared by our engineers for building control.
Project Overview
Location
Richmond, Southwest London
Project Type
Extension & loft conversion
Structural Services
Detailed Calculations
Compliance
Building Regulations
Extension & Loft Conversion – Richmond, London
This Richmond home has been transformed and expanded with a rear extension and loft conversion, creating more space, better functionality, and a seamless blend of modern and traditional design. The homeowners wanted to enhance their ground floor layout for open-plan living, while the new loft conversion added valuable extra space upstairs.
To make this possible, PorthouseDean provided expert structural calculations, ensuring that every element was safe, compliant, and structurally sound. Working alongside Fluent Architectural Design Services, we helped turn this vision into reality.
Maximising Space with Smart Structural Design
This project focused on:
✅ A rear extension – Expanding the living space and improving the ground floor layout
✅ A new loft conversion – Adding additional bedrooms and increasing property value
✅ Steel beam (RSJ) design – Supporting large structural openings for an open-plan layout
✅ Enhanced natural light – Large glazing and skylights brightening the space
What we did
Our structural contributions included:
✔ Structural calculations for the extension & loft conversion – Ensuring stability and compliance
✔ RSJ & steel beam design – Supporting large openings for a seamless open-plan feel
✔ Load-bearing wall assessments – Ensuring safe modifications to the existing structure
✔ Foundation analysis – Strengthening the base for the additional weight of the loft conversion
With our expert calculations, this home has been completely modernised, offering a spacious, stylish, and highly functional living environment.
Planning a Home Extension or Loft Conversion? Let’s Make It Happen!
At PorthouseDean, we provide expert structural calculations for home extensions, loft conversions, RSJ beams, and building control approvals.
📍 Providing structural engineering across Richmond, Twickenham, and Greater London.
Why Extend Your Home?
More Space, More Possibilities
Create an open-plan kitchen, a family hub, or a bright entertaining space.
A Date You Can Plan Around
You choose the delivery date, and the price follows the date.
More Natural Light
A wider opening to the garden needs a beam sized for the load above it. The calculations set that size.
Personalised Design
Every house is built differently. The calculations work from your drawings and the structure you already have.
How PorthouseDean Supports Your Project
Every project is different, but the need for precise, reliable structural calculations remains the same. Our engineers work with:
Homeowners
Ensuring designs are safe, cost-effective, and practical.
Architects
Providing calculations that allow for creative yet compliant designs.
Builders
Making sure construction runs smoothly with clear, reliable specifications.
Planning Your Own Project?
More than 9,000 projects since 2012 have run through the same process. You get a fixed price before you commit, and you choose the delivery date.
📩 Get a QuoteStructural Engineering Services We Offer
Structural Calculations for Loft Conversions
Calculations for the floor, beams and roof changes a loft conversion needs.
Structural Calculations for Wall Knock-Throughs
Beam and support calculations for taking out a wall.
Structural Calculations for Extensions & New Builds
Calculations for foundations, walls, beams and roofs on extensions and new builds.
Structural Calculations for Bi-Fold Doors & RSJs
Beam and padstone sizes for wide openings and bi-fold doors.
Structural Drawings & Building Control Calculations
Complete documentation to help you achieve smooth Building Control approvals.
