Extension & loft conversion (Putney, Southwest London)
The structural calculations behind this project, prepared by our engineers for building control.
Project Overview
Location
Putney, Southwest London
Project Type
Extension & loft conversion
Structural Services
Detailed Calculations
Compliance
Building Regulations
Extension & Loft Conversion – Putney, Southwest London
This Putney home has undergone a complete transformation, featuring a ground floor extension and a loft conversion, designed to create open-plan living spaces while maximising natural light and functionality. The homeowners wanted to reconfigure the property layout to enhance space and modernise the home.
To ensure structural integrity, stability, and compliance with Building Control, PorthouseDean provided expert structural calculations, supporting RSJ beam installations, load-bearing wall modifications, and foundation reinforcements to ensure safety and efficiency.
Maximising Space & Light with Smart Structural Design
This project included:
✅ A single-storey rear extension – Expanding the kitchen and dining area for modern family living
✅ A loft conversion – Adding additional bedrooms and functional space
✅ Structural steelwork & RSJs – Supporting wide openings for a seamless open-plan layout
✅ Large bi-fold doors & skylights – Enhancing natural light and improving indoor-outdoor flow
What we did
Our contributions included:
✔ Structural calculations for the extension & loft conversion – Ensuring safety and compliance
✔ RSJ beam & steel design – Supporting large-span openings and load distribution
✔ Load-bearing wall assessments – Safely modifying existing structures
✔ Foundation analysis – Providing stability for the extended and converted footprint
With expert structural engineering, this Putney home now benefits from a bright, modern, and highly functional layout, perfect for family life, entertaining, and future-proofed living.
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.
📞 Call us at 0161 820 3230 or request a free consultation.
📍 Providing structural engineering across Putney, Wandsworth, and Southwest 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.