Negotiate with the developer first.

If the brand or material of doors and windows has changed, you should negotiate with the developer to resolve the issue. If negotiation fails, you can file a lawsuit claiming that the other party breached the contract and require the contract to be terminated and compensation for losses. If there are quality problems with the entrance doors and windows of newly delivered houses, you can ask the developer to replace or repair them, and the developer will bear the corresponding responsibilities.

The entrance door, door and windows of the finely decorated room are all made of the same material and style. In order to save decoration costs, many developers choose some thin and cheap hardware materials for doors and windows. In the later use process, they are prone to rust, breakage, deformation, and damage.