The ground
Langley Silt · chalk · river gravel · alluvium
Caversham’s centre is mapped on chalk covered by Langley Silt, a deposit the British Geological Survey describes as ranging from silt to clay, commonly yellow-brown. The same silt is mapped half a kilometre to the east, south-east and south-west.
Elsewhere on that half-kilometre ring the picture changes: river gravel to the north-east and north-west, alluvium (clay, silt, sand and gravel laid down by running water) to the south, and open chalk at the north and west points. The Thames is about 0.3 km south-west of the centre. With that much variety, what you find in one garden is a poor guide to the next.
Planning
Reading Borough Council · St Peter’s · Surley Row
Reading Borough Council handles planning in Caversham, which has no civil parish. The centre isn’t in a conservation area, but St Peter’s is about 0.2 km away and Surley Row about 1 km, so look up your address first if tree work or a change to a front boundary is planned. Inside a conservation area, the council needs six weeks’ notice of tree work, with an exemption for trees less than 75 mm across at a height of 1.5 m.
No National Landscape covers Caversham; the nearest, the Chilterns, has its boundary about 2 km from the centre. Away from conservation areas, fences, walls and gates up to two metres, or one metre beside a road used by vehicles, don’t normally need planning permission, and a garden building within two metres of a boundary is limited to 2.5 metres in height under permitted development.