Hi OP. Check the terminology you are using.
The development I bought in worked like this:
There was a “management company” for eg. Shady Pines Estate Management Company, which was a limited company that held the assets of the shady pines estate eg. All the land that wasn’t privately owned eg. Gardens, play area, private roads, and took decisions regarding the interests of the development. It was listed with companies house etc. and had appointed directors. To start with these directors were also the directors of the developer. When the developer finished building “shady pines” and wanted to be shot of it, they called and held a special general meeting to handle the resignations of the developers directors and the voting in of new directors from the property owners.
Shady Pines Estate Management Company retained the services of a property management company eg. Bordeaux Property Management. Bordeaux handled the practical management of The Shady Pines Estate eg. Managed the contract with the garden services company which cut the grass. They also did the invoicing and collection of service charge fees from residents and did things like making sure the communal areas electric bill was paid.
Shady Pines can appoint whoever they like to administer the estate, as long as the hiring and firing is done is accordance with the contract between those companies.
A HOA is something different. We did look at going down that route but it was abandoned when people lost interest/ran out of steam. (Stupid)
However, before we the HOA fizzled, we successfully set up an informal group of residents to monitor the handover. Bear in mind, just as your home needs snagging, so does the entire estate. If the developers lot are still “in charge” of the management company, they can sign off whatever they like and the management company (ie. Shady Pines) can be left carrying the can.
We created an indisputable paper trail with outstanding issues (not relating to individual properties) and pushed back HARD. We went as far as going back through the planning permission to see what conditions had to be met and made sure they were all discharged and signed off by the planning office before we would allow the developer to hand the development over. It look an additional 2 years.
I’m sorry if this is coming out garbled. Combination of late night and phone.
Regarding your issue of the service charge estimate, iirc, there is something about what can be “reasonably expected” in terms of accuracy. This is not persimmons first rodeo and it would therefore be reasonable to expect their estimate to be more accurate, them given their experience and expertise in the industry. Blah, blah, blah.