Contentious plans for 100 new houses on a greenfield site in Pembrey have been rejected by Carmarthenshire councillors.
After lengthy discussions and speeches by objectors and an agent on behalf of applicant Persimmon Homes, the planning committee turned down the scheme by a large majority.
Members cited access and road safety concerns and the estate's impact on the Welsh language among other reasons.
Council officers had recommended the scheme, off Garreglwyd, for approval subject to conditions.
But the Welsh Government had received a call-in request and directed that the committee could only refuse the application or signal but not grant approval.
The development was to comprise two, three, four and five-bedroom properties, with 20% of them classed as affordable. It would have increased Pembrey's population by just under 6%.
Three open spaces would also have been created with access to the site via the A484 and from there via Garreglwyd.
Persimmon Homes was to pay for sewerage upgrades and contribute £146,000 towards education improvements. It had also been asked to contribute £50,000 to upgrade culverts.
Addressing the committee, objector Nicholas Cliffe said the proposed access via the A484 would have turned a "difficult" junction into a "dangerous" one.
He also claimed the nearby grade two-listed Court Farm "will be submerged in a sea of roofs".
Another objector, Elaine Morrisroe, said existing drainage problems meant some residents were told not to flush their toilets during heavy rain.
Agent Pete Sulley, speaking on behalf of Persimmon Homes, said the development would not affect the setting of Court Farm and that neither Dyfed Archaeological Trust or heritage body Cadw had objected.
Mr Sulley also said the creation of 100 homes could also result in a greenfield site being taken out of the county's new development plan.
Pembrey councillor Hugh Shepardson said he took issue with the proposed access, describing it as "shambolic".
He said: "It's going to be an absolute nightmare."
Persimmon Homes's revised application had prompted 162 letters of objection.
Several committee members asked or raised concerns about the access while wildlife and drainage matters were also brought up.
Cllr John James said he felt the development would be out of character with the area and proposed that the committee rejected it.
His proposal was seconded and, after further debate and responses from officers, was approved in a show of hands.
Persimmon Homes can appeal the decision.
