Structural Design for Two-Storey Extensions & Loft Conversions
At Vanguard Engineers, we know two-storey extensions and loft conversions place extra demands on a building's existing structure. We assess what's needed, design the structural solution, and provide calculations and drawings for building control — covering Essex, East London and nationwide.
About This Service
Structural design for extra storeys and loft space
Two-storey extensions and loft conversions typically involve new floors, multiple steel beams, and significant roof alterations. We design foundations through to roof structure, including dormers and hip-to-gable changes, with drawings and specifications ready for Building Control.
The package covers how the new work interfaces with the existing building so load paths remain clear and construction can proceed with confidence.
What We Provide
Included in this service
- Site visit or remote review of architectural drawings and proposed layout
- Foundation design — strip, trench-fill, or reinforced concrete based on ground conditions
- Structural design of load-bearing walls, beams, and lintels
- Floor structure design — joists, trimmers, strengthening, and load transfer
- Roof structure design — rafters, purlins, ridge beams, dormer framing, and hip-to-gable alterations
- Structural drawings suitable for Building Control and construction
- Full written specification and Building Control-ready documentation
- Guidance on interfacing the new structure with the existing building
Project Information
When this applies & how we work
Typical situations
- Two-storey rear or side extension
- Loft conversion with dormer or hip-to-gable alteration
- Projects requiring new floors, roof structure, and multiple steel beams
- Extensions involving large openings for bi-fold or sliding doors
- Homeowners wanting the complete structural design handled in one package
Process
- 01ReviewArchitectural drawings, layout, and site conditions assessed
- 02Site visitExisting structure, foundations, and ground conditions inspected
- 03DesignFoundations, walls, beams, floor structure, and roof designed
- 04DeliveryComplete signed structural package ready for Building Control
Planning a two-storey extension or loft conversion?
Share your architectural drawings — we’ll confirm scope and deliver a complete Building Control-ready package.
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