
Case Study: 2210mm of Ceiling Inside a 2500mm Limit
16 June 2026
Permitted development caps a garden room at 2.5m tall, and a big room needs deep joists. This customer wanted maximum headroom and refused to thin the insulation to get it. So we dug a pit, tripled up the floor timbers, reshaped the roof and hid a steel plate inside a beam.





