Single bowl or double bowl?

A double bowl separates washing from rinsing and suits a household that cooks daily. A single bowl gives you one large space, which is easier for big pots and trays. The cabinet width usually settles it: a double bowl in too narrow a cabinet leaves two bowls that are both too small to use.

What size sink fits my cabinet?

Work from the cabinet width and subtract enough on each side for the worktop to hold together. Then check the depth against the cabinet, and remember the trap has to fit underneath. Bring the cabinet dimensions rather than the size of the hole you are hoping to fill.

Top-mount or undermount?

Top-mount is the forgiving choice: it drops in, the rim covers the cut, and it works with almost any worktop. Undermount gives a cleaner edge to wipe crumbs into but needs a worktop material that can support it and a properly finished cut. That decision has to be made before the worktop is fabricated.

Why is my kitchen tap weak?

Usually water pressure rather than the tap. Gravity-fed supplies in older units and landed houses often cannot drive an aerated spout or a pull-out spray properly. A booster pump is the standard fix, and it is worth checking the supply before blaming the fitting.

Do I choose the sink or the tap first?

The sink. It sets the cut-out and the tap hole, and it is the piece the cabinet has to accommodate. A tap can almost always be matched to a sink; a sink cannot always be matched to a tap you have already bought.