
Permitted development rights let a detached house extend 8m to the rear. The real limits, the £249 prior approval, the 42-day clock and where Kent differs.

Permitted development rights let a detached house extend 8m to the rear. The real limits, the £249 prior approval, the 42-day clock and where Kent differs.

Heat pump vs gas boiler on the October 2026 cap: gas heat costs 8.86p per kWh, so a heat pump has to beat a SCOP of 3.0 to be cheaper to run.

Heat pump costs, grants and planning in 2026: £7,500 off an air source install, around £12,000 typical, and the 1.5m³ permitted development limit.

Double glazing in Kent must hit 1.4 W/m2K or Band B, and timber lost its softer allowance in 2023. What to check, and who to check it with.
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