Large extension (Finchley, Barnet)
The structural calculations behind this project, prepared by our engineers for building control.
Project Overview
Location
Finchley, Barnet
Project Type
Large extension
Structural Services
Detailed Calculations
Compliance
Building Regulations
Large Home Extension – Barnet, London
Located in Finchley, Barnet, this property underwent a major transformation with a large home extension designed to create more space, a modern layout, and a seamless connection to the outdoors. The homeowners wanted to enhance their living space with a light-filled, open-plan design, featuring large structural openings and a contemporary finish.
PorthouseDean worked alongside Detailed Planning Architects, providing structural calculations to ensure stability, compliance, and efficiency throughout the build.
Expanding & Enhancing the Property
To make the most of their home, the owners focused on:
✅ A spacious rear extension to open up the ground floor
✅ Large steel-supported openings for a bright and airy living space
✅ An improved structural layout for better flow and connectivity
✅ A strong, future-proof foundation to support the additional space
What we did
Our structural input included:
✔ Steel beam & RSJ calculations – Supporting large-span openings for an open-plan design
✔ Load-bearing wall assessments – Ensuring safe wall removal and structural integrity
✔ Foundation design – Strengthening the base for the new extension
✔ Building Control compliance – Ensuring all structural elements met regulations
With expert engineering in place, this home extension has completely transformed the property, creating a modern, spacious, and highly functional home for the owners.
Thinking About a Home Extension? Let’s Make It Happen!
At PorthouseDean, we specialise in structural calculations for home extensions, open-plan renovations, RSJ installations, and wall removals.
📍 Providing structural engineering across Barnet, Finchley, 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.