When I install bathroom vanity units the first thing I want to determine is the finished height. This is almost always governed by the unit height + plinth + the floor covering thickness. I start by putting a long spirit level on the floor to work out the lowest point of the room just in case the floor is out of level, and start from there. If you start at the highest point and the units are level, the plinth won't be tall enough where the floor falls down out of level.
You don't want to install bathroom vanity units too high, if unsure it's always better to be a little too low and have to trim the height of the plinth down a little for a tight fit than to have a gap that you can do very little with. This way, you can scribe the plinth down tight to the floor for a tight fit as well.
Once the thickness of the floor is determined (this could be as much as ply + undertile heating + adhesive + tiles) and I've measured the height of the plinth I can add that to the height of the units. This measurement is the overall height to install vanity units, and will be the bottom of the counter. Find the lowest area of the floor and measure up the wall that amount, then use a spirit level to mark a straight level line around the walls.
Most bathroom units come with plastic legs that are height adjustable. Unwrap the base units and screw the legs onto the bottom. I adjust all these to the height of the plinth before screwing them to the bottom of the cabinets. As you can see in the picture below, the front of the unit is on the left and the feet have a flat part which should face the front for the plinth to butt up against. Also, the flange should overlap the outer edge of the carcass otherwise all the weight is being loaded down onto the bottom shelf of the unit. With the overlap, the foot is also supporting the side panel of the carcass as opposed to just the bottom shelf. Sometimes I install bathroom vanity units with granite or marble counter tops so it's important to have that extra bit of strength because of the added weight on top.
When I install bathroom vanity units they rarely fit perfectly in to a space and an infill will need to be used. Mark all the unit positions on the wall and put the last one in place. Now an offcut of plinth or an end panel if they've supplied one can be marked to fill the space. Fix it through the back with a batten, if it's wider than the one in the pictures below a batten up the wall is needed too.
Like kitchens, bathroom units have french cleat style brackets that screw to the wall and clamps inside the unit that hook over them. These clamps have screws in them to finely adjust the unit for height. Simply hold each unit in position and mark where the brackets need to be on the wall then remove the units and screw the brackets back. If the wall is masonry use plugs and screws, or click here for suitable plasterboard fixings.
The units also need to be fixed to each other. I always clamp the units together to stop them moving when drilling a hole through them for the bolts. Ideally these want to be in a discreet/least visible position. Sometimes you can fit them behind hinges or where a shelf will later hide them from view, otherwise go for the top corner out of site.
Hold or clamp a scrap piece of timber on the other side when drilling to prevent annihilating it when the drill bit breaks through.
Once levelled across the back and from front to back I always use a framing square to check that the front of the units are square too. If not, it'll be impossible to get the doors to all line up nicely later on.
Hanging the doors is fairly straight forward, as long as you install bathroom vanity units perfectly square. Most off the shelf cabinets use concealed hinges. These are adjustable and can open to 110°. Part of the hinge screws to the door the other to the unit and the holes to screw into are either pre-drilled or marked with a pinhole.Once each part is screwed on, the door can be offered up to the cabinet and the hinges simply click in.
Once on, the doors can be adjusted up and down, left and right + forward/backward a little. When they all line up perfectly click the soft closers onto the hinges if supplied.
Quite often the position of the handles are marked with a pin prick inside the cabinet door, but handles come in different sizes! I always double check the positions line up with the handles and make sure the client is happy with where they are before I start drilling any holes. As in the picture below, I always hold a scrap piece of timber on the back of the door I'm drilling to prevent damaging the surface when the drill bit comes out.
When I install bathroom vanity unit counter tops I try and get the ones that have prefinished ends, like these were. So all I had to do was cut the left side (that butts the wall) off when cutting to length.
To mark the sink cut-out I put masking tape on the worktop so I can see them my markings when cutting. Because there's a slight overhang at the front, I had to allow for this and add it onto what I was cutting out of the back so the sink would slide right up to the cabinet fascia.
Once the positions are marked and I've held the sink in place to double check, I put the counter on scrap timbers and cut the shape out with a plunge saw. You can use a normal circular saw (but cut from underneath) instead or a jigsaw, with a really sharp blade. Also, fix a batten along the wall to support the back of the counter once the chunk has been cut out.
Fitting the plinths is one of the easier jobs. Cut them to length, and place them face down up against the legs. Transfer the center of the legs onto the back of the plinth and screw them on. I always stagger them slightly (high to low) to prevent the plinths rocking if they get kicked. (make sure screws are short enough not to go through).
If the plinths need to return round the side of the unit, use a piece of plinth to mark on the floor the outside egdes of where each will be. Cut the front one first, keeping the finished edge of the plinth on the outer most part and finally cut the return one up to the back of the front plinth.
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