Residential
Structural Design
Structural design for house extensions, loft conversions, internal alterations, and new dwellings.
What We Do
Frame Modus provides structural design for residential projects of all sizes. Whether you are planning a single-storey rear extension, converting a loft, altering internal layouts, or building a new dwelling, we deliver the calculations and drawings needed to obtain Building Control approval and support construction.
Our service includes load assessment, member sizing, foundation design, and the production of structural drawings coordinated with your architect's plans.
Scope of Service
Load Assessment
Analysis of existing and proposed structural loads, including dead loads, imposed loads, and wind actions in accordance with BS EN 1991.
Member Sizing
Design of steel beams, timber joists, lintels, and other structural elements sized to current Eurocodes and British Standards.
Foundation Design
Design of strip footings, trench fill, raft foundations, and piled solutions tailored to site-specific ground conditions.
Structural Drawings
Production of clear, detailed structural drawings showing beam positions, foundation layouts, and construction details for contractor use.
How It Works
Initial Consultation
We discuss your project requirements, review architectural drawings, and establish the scope of structural work needed.
Site Assessment
Where required, we visit the site to assess existing conditions, take measurements, and identify any constraints that may affect the design.
Design & Calculations
We produce full structural calculations and drawings, ready for Building Control submission and contractor use.
Construction Support
We remain available throughout the build to answer site queries, review conditions, and provide amended details where needed.
Frequently Asked
In almost all cases, yes. If your extension involves new openings in load-bearing walls, new beams, foundations, or any change to the way loads are carried through the building, Building Control will require structural calculations and drawings produced by a qualified structural engineer. Even single-storey rear extensions built under permitted development rights still need Building Regulations approval, which means structural input is required.
Fees vary depending on the size and complexity of the project, the number of structural elements involved, and whether a site visit is required. For a typical single-storey rear extension on a residential property, fees usually fall within a few hundred to around a thousand pounds plus VAT. We provide a clear, fixed quote up front once we have reviewed your architectural drawings — there are no hidden charges.
Building Control will expect a full set of structural calculations covering all load-bearing elements (beams, lintels, foundations, floor joists) along with structural drawings showing beam positions, foundation layouts, and key construction details. We provide a complete package coordinated with your architect's plans so the application can be submitted without delay.
Yes — we regularly collaborate with architects, designers, and builders across Hertfordshire and London. We can take architectural drawings directly from your architect and produce calculations and structural drawings that align with their layouts, or we can liaise with your builder on site to resolve queries as they arise.