PorthouseDean Structural Engineers

For a typical single-story extension or loft conversion, aim for a sweet spot of £600-£900 (including VAT). Paying less raises concerns about reliability and checking. Paying more might mean you're funding unnecessary fancy BIM models. Demand clear information, full insurance, and solid aftercare. Site visits often add cost without value. Don't cut corners on structural integrity, but don't overpay either.