There is an Amersham down in the valley and an Amersham up on the hill, and a job in one has very little to do with a job in the other. Old Amersham sits down in the Misbourne valley. A broad High Street of Tudor and Georgian fronts, the seventeenth-century market hall, coaching inns that still have their carriage openings. Amersham-on-the-Hill grew up around the station after the Metropolitan Railway arrived in 1892. Proper Metro-land, the Weller Estate laid out from 1930, streets of solid thirties houses on decent plots. The difference starts under your feet and works its way up to the gate.
The ground under Amersham
This is chalk country, but it isn’t the same chalk everywhere. Up on the hill and along the high ground either side of the valley, the chalk lies under a lid of clay-with-flints, a stiff flinty layer that carries winter water, shifts with the seasons and blunts whatever you send into it. Down in the valley the river has left silt and old gravel beds over the chalk, so ground near the water can be softer than it looks, with a water table worth checking before anyone prices a foundation. The Misbourne has a long history of running low. But a shy river does not mean dry ground.
The chalk itself is the good news. Clean chalk digs well and drains better. Soakaways that would sulk in clay tend to work here, which shapes how we design drainage and driveway run-off. On the clay-capped ground, footing depths get planned around the clay and the trees. Beech, oak and shrinkable clay are a pairing that deserves respect, not guesswork.
THE GROUND HERE
- Chalk bedrock throughout, with flints. Kind to soakaways, unkind to buckets
- Clay-with-flints capping the higher ground. Seasonal movement, winter water
- Softer silts and gravel beds on the valley floor near the Misbourne
Old town, hill town, two kinds of access
Old Amersham changes how a job gets planned before a machine is even chosen. Much of the old town is a conservation area, and behind those High Street fronts the way in is often an opening sized for a horse and cart, so the opening decides the machine, and spoil leaves in more loads than a modern plot would need. Anything touching a listed building or its setting deserves an early conversation with the local planning authority, because the answer shapes the groundworks.
Up on the hill the rhythm changes. Side passages between the thirties houses, established front gardens, neighbours close enough to mind about mud on the road. That gets planned for as well: boards down on the drive, the pavement swept before the van leaves, heavy deliveries kept out of the hours when the road is already full.
WORTH KNOWING
Old Amersham’s conservation area covers most of the old town, with more than 150 listed buildings on and around the High Street. External works such as walls, driveways and anything visible may need consent, so check with Buckinghamshire Council before the design gets fixed.
A rear extension behind a High Street frontage, a basement under a Metro-land gable, a new driveway on the Weller Estate. Every one of them begins in the same two places: what is under the garden, and how wide the gate is. Put the job in front of us and those are the first two things we will want to see.
We work the villages and towns around here on much the same ground.
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