COUNCILLORS overturned the advice of their officers and deferred a decision on outline plans for residential development at Broughton Park.
Flintshire County Council's planning and development control committee had been recommended to approve the preliminary application subject to a legal agreement.
But Cllr Chris Bithell argued the application, which could see 260 new homes, should be deferred to enable highway issues to be fully discussed and to consider how the proposed agreement would benefit Broughton Infant and Junior schools and St David's High School.
Officers said they believed the issue could be decided at the meeting but councillors agreed to defer a decision.
A design brief for the triangular shaped site adjacent to Broughton Park envisages a modern residential neighbourhood with a strong local identity which encourages a sense of community, according to a report.
A figure of 260 new homes, including flats and houses, is mentioned with 78 affordable properties
The development would include a large area of public open space, a play area and a multi use games area.
Transport and highway measures could see cycling facilities, a pedestrian link to Broughton Hall Road and pedestrian and cycle crossings.
A possible £500,000 could be paid for improvements to local education facilities.
The council says it also wants to see provision for a health centre.
Broughton and Bretton Community Council believes the development, together with other proposed new build in and around Broughton Park, should be considered as part of a comprehensive plan.
Planning officers say they have had 124 objections.
These raise traffic related issues and the effect on residential, visual and general amenities.
County planners point out the Green Barrier site is allocated for residential in the emerging Flintshire unitary development plan.
Consultants brought in by the council have confirmed there would be no major highway issues.