A great many Northampton back gardens were never gardens at all, and that is the single most useful thing to know before designing one.
In the boot and shoe streets the space behind a terrace was a working yard. It was surfaced, built on, used for storage and materials, and in many cases had a workshop at the far end. When somebody turns that into a garden, the topsoil is usually imported and shallow, and underneath it there is frequently old hardstanding, brick rubble from a demolished outbuilding, or the foundations of something that is no longer there.
That matters practically rather than historically. Planting into ninety millimetres of imported soil over a concrete yard will disappoint whatever you spend on the plants. A lawn over buried rubble will dry out and yellow every summer in the same patches. And a base for a garden room may find a redundant foundation that is either a bonus or an obstruction depending on where it sits. We dig a trial hole before designing rather than after.
The rear entries that served those yards are a genuine advantage, since they let a machine and materials reach the garden without going through the house, which is rare in a terraced street.
Front hard surfacing over five square metres needs a permeable material or drainage to a soft area within your boundary, or planning permission. Our landscaping page shows the range of the work.