We maintain the grounds for management companies around the North West. Normally costs would be a lot higher for apartment blocks rather than houses where communal indoor areas and lifts shoot up prices. Maintenance of Electric gates into the development is costly and sometimes the local council don’t take over maintenance of drains/roads for a period of time which could fall on the homeowners if there’s a problem. I can’t see the price being too high although obviously best to get a firm price and projected increases. Cheapest house based development should be a few hundred per year, top end apartments are a few thousand.