Residential Build on Landfill Site

I’m ready to move ahead with a new-build home on a plot that was once an uncontrolled landfill and produces methane gas. All the usual residential items—slab, walls, roof—now have an extra layer of complexity because of ground-gas migration, variable fill and possible differential settlement, so I need a structural engineer who is comfortable marrying everyday house design with contaminated-land constraints.

You’ll be working from the site investigation I already have, which confirms both methane and CO₂ exceedances. I need you to translate those readings into a robust structural solution: foundation type, ground-gas protection, and any venting or membrane specifications that keep Building Control satisfied and the future occupants safe. Expect to coordinate briefly with my geo-environmental consultant to ensure your structural details dovetail with their remediation plan.

Deliverables I must walk away with:
• Full structural calculations and drawings (PDF + DWG) suitable for Building Control submission
• A foundation and ground-gas mitigation plan that references BRE/BS standards for methane protection
• A concise construction-phase method statement highlighting any special sequencing or monitoring
• A schedule of materials and loadings my contractor can price directly
need to say how preferential gas pathways to be sealed

If you’ve designed residential structures on brownfield or landfill sites before and can point to a project where methane barriers, venting layers or piled foundations were required, we should be a perfect fit. I’m aiming to appoint quickly so please include a brief note on relevant experience and the software you’ll be using (ETABS, Tekla, Robot, etc.).