you don't necessarily need the door casing in before plasterboarding, but you do need them fitting before skimming.
for a standard 30" door and casing, the studs need to be set at 813mm (32") apart. this will allow a little leeway as the actual size of a standard moulded casing is 805mm.
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local