Planning Permission Guides for Knowsley
Free guides for 15 types of home improvement project. Learn about permitted development rules, typical costs, and which professionals you need — all based on real GPDO regulations.
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Rear extension
Class A£18,000–£38,000
Loft conversion
Class B£25,000–£48,000
Side extension
Class A£20,000–£42,000
Wraparound extension
Class A£32,000–£65,000
Dormer
Class B
Outbuilding / garden building
Class E£7,000–£22,000
Porch
Class D£3,500–£11,000
Garage
Class E£10,000–£25,000
Roof alteration
Class C£3,500–£11,000
Fence, wall or gate
Class A (Part 2)£700–£3,500
Basement
Planning required£75,000–£190,000
Windows & doors
Usually permitted£2,200–£11,000
Driveway
May need permission
Solar panels
Usually permitted£4,000–£9,500
Satellite dish
Usually permitted