Sefton Central Labour MP Bill Esterson said he was delighted for Aintree and Melling residents who led a successful campaign against plans to build houses on greenbelt land between the two villages.
Sefton Planning Committee rejected an application on Wednesday evening to build up to 100 houses on land off Spencer's Lane.
The site earmarked for the development is greenbelt.
Bill Esterson formally submitted his own written opposition to the plans in the weeks before the application went before the planning committee.
In his objection, Bill Esterson stated: "According to the current local plan, the site is in green belt. Green belt land should not be released for development except in exceptional circumstances. Residents have raised concerns about increased traffic, flood management and the impact on school places, availability of places at doctor surgeries and the ability of other services to look after the proposed increase in population. If consent is given, then some of the housing should be allocated to people living in the local community.
"I would therefore ask that the above points are considered in any decision that is taken."
Speaking after the decision to reject the application, Bill said he was delighted his concerns and the concerns of local people were listened to.
Bill said: "A large number of residents contacted me with concerns about this application. When I looked at the detail of the application itself, I shared their concerns. That is why I formally submitted my own written opposition to the proposal.
"Firstly the site for this proposed development is greenbelt land. Sefton Council currently has a clear policy that states greenbelt land should not be built upon unless there are 'exceptional ciurumstances'. There were no such circumstances in this case.
"Next, there are the considerations of a development of this size on the infrastructure of both Melling and Aintree.
"I don't believe the roads here would be able to cope with such a large increase in traffic that 100 new homes would generate. That goes for the sewage and flood management.
"The impact on existing schools places and other local facilities would have been hugely detrimental to these communities too.
"We are already seeing in Melling the problems residents are having at their one local surgery which has gone down to part time hours. More residents would have made it even more difficult to get to see a GP in the village.
"So I applaud the residents for their successful campaign in getting this application rejected."