Rear Extension Structural Design £650.00 + VAT Loft Conversion Structural Design £750.00 + VAT Loft Conversion With outrigger structural design £950.00 + VAT Loft conversion and rear extension structural design £1,400.00 + VAT New basement reinforced concrete design £2,200.00 + VAT underpinned basement design£2,900.00 + VAT