Hello, I am a solicitor with 20 years experience. I will try to help you with this.
A restrictive covenant might well provide you with the protection you need. In order to be valid it mus be in writing and it must place a burden on the land of the covenantor that must provide a direct benefit to the land owned by the covenantee ( you in this scenario). If a future purchaser can argue convincingly that further building will not adversely affect your land then the covenant will not be enforceable but if you can show it would aversely affect your land then it would be. This is likely to turn on specific local factors like size of land, closeness and size of planned buildings etc. These are complex matters and it would be very sensible or you to instruct a solicitor in the usual face to face way to advise on this.
I don't understand why you have given me a poor rating. Is there any more information you want?