Coventry gardens split the same way the houses do. On the interwar and post-war estates there is usually room to work, side access and a reasonable plot. On the Victorian terraces the garden is narrow, walled on both sides, and reachable only through the house or over a fence.
That second case is the one that decides the price. Every tonne of aggregate and every slab is carried, not barrowed round the side, and a job that would take four days on an estate house takes considerably longer on a terrace. We would rather explain that with a quotation in hand than have it appear later as a variation.
On front gardens there is a national rule that catches people constantly. Laying more than five square metres of hard surfacing to the front of a house needs either a permeable material or a way of draining the run off to a soft area inside your own boundary. Do neither and it needs planning permission. It is easy to design around when it is known about at the start and awkward to unpick afterwards. Where the frontage is in a conservation area or under an Article 4 direction there may be further control on top of that, including on the boundary wall.
Retaining walls are structure, not decoration. Anything holding back a real change in level gets designed and drained rather than stacked. Our landscaping page shows the range of the work.