Extension (Barnet, North London)
The structural calculations behind this project, prepared by our engineers for building control.
Project Overview
Location
Barnet, North London
Project Type
Extension
Structural Services
Detailed Calculations
Compliance
Building Regulations
Single Rear Extension – Barnet, London
This Barnet home has been transformed with a single-storey rear extension, creating a more spacious, open, and light-filled living area. The homeowners wanted to extend their ground floor to accommodate a larger kitchen-diner while improving the connection to the garden with large glazing and open-plan design elements.
To ensure the structure was safe, stable, and fully compliant with Building Control, PorthouseDean provided expert structural calculations, supporting the extension with steel beams, load-bearing wall modifications, and foundation reinforcement.
Enhancing Space & Light with Smart Structural Design
This extension was designed to:
✅ Expand the kitchen and living space – Enhancing flow and usability
✅ Introduce large glazing and bi-fold doors – Maximising natural light and outdoor access
✅ Ensure open-plan stability – Using RSJs and structural steel for wide-span openings
✅ Improve property value – Creating a modern, functional space with long-term benefits
What we did
Our role included:
✔ Structural calculations for the rear extension – Ensuring safety and compliance
✔ RSJ & steel beam design – Supporting large-span openings for an open-plan feel
✔ Load-bearing wall assessments – Modifying the existing structure safely
✔ Foundation analysis – Ensuring stability for the extended footprint
With expert structural support in place, this Barnet home now benefits from a modern, functional, and highly practical rear extension, perfectly suited for family life and entertaining.
Planning a Home Extension? Let’s Make It Happen!
At PorthouseDean, we provide expert structural calculations for home extensions, RSJs, open-plan layouts, 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.