Extension & loft conversion (Finchley, London)
The structural calculations behind this project, prepared by our engineers for building control.
Project Overview
Location
Finchley, London
Project Type
Extension & loft conversion
Structural Services
Detailed Calculations
Compliance
Building Regulations
Single Storey Extension & Loft Conversion – Finchley, London
This Finchley home has undergone a major transformation, featuring a single-storey rear extension and loft conversion, effectively doubling the size of the existing property. Designed to create a modern, open-plan living space, this project required expert structural engineering to ensure stability and compliance.
To support these significant structural modifications, PorthouseDean provided expert structural calculations, designing a series of goalpost frames to maintain lateral stability while allowing for wide, unobstructed open-plan layouts.
Maximising Space & Structural Stability with Smart Engineering
This project included:
✅ A single-storey rear extension – Expanding the kitchen, dining, and living space
✅ A full loft conversion – Creating additional bedrooms and functional living areas
✅ Goalpost frame installation – Ensuring lateral stability after significant internal alterations
✅ Seamless integration with the existing structure – Designed for long-term durability and compliance
What we did
Our contributions included:
✔ Structural calculations for the extension & loft conversion – Ensuring compliance with Building Control
✔ Steel goalpost frame design – Supporting large structural openings and maintaining stability
✔ Load-bearing wall assessments – Ensuring safe modifications to the existing structure
✔ Foundation analysis – Providing strength and durability for the extended footprint
With expert structural engineering, this Finchley home now benefits from a bright, modern, and highly functional open-plan layout, perfect for family living, entertaining, and future-proofing the home.
Thinking About a Home Extension or Loft Conversion? Let’s Make It Happen!
At PorthouseDean, we provide expert structural calculations for home extensions, loft conversions, RSJs, and open-plan renovations.
📍 Providing structural engineering across Finchley, Barnet, and North 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.