Extension (Watford, Hertforshire)
The structural calculations behind this project, prepared by our engineers for building control.
Project Overview
Location
Watford, Hertforshire
Project Type
Extension
Structural Services
Detailed Calculations
Compliance
Building Regulations
Two Storey Extension – Watford, Hertfordshire
This Watford home has been transformed with a large two-storey rear extension, creating additional living space across two floors, enhancing both functionality and property value. The project also included internal alterations and a part garage conversion, allowing the homeowners to make the most of their available space while ensuring the structure remained safe, stable, and compliant with Building Control.
To bring this ambitious project to life, PorthouseDean provided expert structural calculations, supporting the structural framework, steel beam reinforcements, and load-bearing wall modifications. The project was successfully delivered in partnership with Detailed Planning architects.
Maximising Space & Functionality with Smart Structural Design
This project included:
✅ A two-storey rear extension – Creating additional living and bedroom space
✅ Internal layout reconfiguration – Enhancing flow and usability throughout the home
✅ Garage conversion for extra functionality – Expanding the ground floor’s usable space
✅ RSJs & structural steel design – Supporting large openings for a modern, open-plan effect
What we did
Our contributions included:
✔ Structural calculations for the two-storey extension – Ensuring stability and compliance
✔ RSJ beam & steel design – Supporting large-span openings and new structural loads
✔ Load-bearing wall assessments – Ensuring a stable structure after modifications
✔ Foundation analysis – Providing stability for the extended footprint
With expert structural engineering, this Watford home now benefits from a spacious, modern, and highly functional two-storey extension, perfect for growing families and contemporary living.
Thinking About a Home Extension? Let’s Make It Happen!
At PorthouseDean, we provide expert structural calculations for home extensions, RSJs, garage conversions, and open-plan layouts.
📍 Providing structural engineering across Watford, St Albans, and Hertfordshire.
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.