Loft conversion • Structural engineer
Need a structural engineer for your loft conversion? We design loft RSJs, floor beams and ridge beams with Building Control-ready calculations, clear drawings and practical notes your builder can follow on site.
We work with homeowners, architects and loft companies across the UK, providing loft conversion structural design and calculations that satisfy Building Control and keep projects moving.
Typical rear dormer loft conversion
From simple rooflight lofts to full rear dormers, we focus on safe, buildable steelwork and joist layouts that work with your property.
We design steel beams to support new dormer walls, roofs and floor joists, checking loads on existing walls and foundations.
Structural design for hip-to-gable roof changes, including new gable walls, ridge support and loads into existing structure.
Where you keep the existing roof shape, we design strengthened joists and any small beams for stairs or openings.
Short guides recorded by our engineers, covering planning a loft conversion and choosing between timber, steel and flitch beams.
Walks through key structural points to think about before you start, including roof form, loads and floor joists.
Compares timber, steel and flitch beams for loft work, and explains where each option makes sense structurally.
For most standard loft conversions where we design the RSJs, floor beams and ridge beam, structural calculation packages usually fall within a clear fixed fee range. The exact figure depends on the number of beams, whether you have dormers and how complex the existing structure is.
Figures here are a guide only. We always confirm a fixed fee in writing once we have seen your plans and photos so you know the cost before we start any calculations.
Guide fee range
£450 – £750 + VAT
Typical structural calculation pack for a domestic loft conversion. Larger or more complex projects are quoted case by case.
A quick overview of timing, information needed and how Building Control uses our loft conversion packs.
Ideally we need architect plans or loft company drawings, plus the property address and some clear photos of the loft space and external roof. If you do not have drawings yet, we can often give a ballpark guide based on photos and a short description, then firm the fee up once plans are ready.
For straightforward loft conversions, we usually work on a timeframe of around five to seven working days from receiving clear information and payment. Where deadlines are tight, let us know and we will confirm if we can meet the dates before you commit.
Yes. Our calculations follow current UK design codes and are set out in a clear way Building Control officers see every day. If your officer has any queries, we can answer them directly and make minor clarifications where needed.
Often yes. Many loft specialists provide survey drawings that are fine for structural design. As long as we have accurate dimensions and sections, we can usually work from their information and your photos.
Use this form to outline your loft conversion. Your enquiry goes straight to an engineer, not a call centre.
If you are planning a loft conversion and want clear structural calculations for RSJs, joists and ridge beams, send us a few details and we will confirm the next steps and a fixed fee.
