You will have to provide more info.

Agree we need more info. Are you saying you only purchased the ceramic top? If you purchased the full vanity it can be installed without being wall to wall.

I'm confused. 750 means the 750mm unit? You looked at the plan? If the builder is building to a plan and the dimension is 750mm how has the builder now decided that it's too small? I'm sorry, I think I'm even having difficulty making my question make sense.

Sorry everyone if I have confused the issue. On the plan the vanities go from wall to wall, (1800) but I only ordered vanities that are 750 wide, so the builder is saying they will look silly in the space. I was wondering if the ones I have purchased could be boxed in somehow to cover the larger area? They are wall hung vanities.

Can you post the plan and an image of the vanity. You could install with a 100 mm gap on each side and between.

No your builder can’t box them in without it looking dodgy. Sell them and start again. Or install two next to each with a small gap. But really it’s a new build and you’ll regret not doing it properly for years, long after the additional expense has been forgotten. Don’t forget it would cost extra in contact variation, materials and labour to have your builder box them in.

'Here are examples of twin vanities and boxed ln. Make the box a feature.

You said you bought all the vanities. HOW MANY vanities do you have that are 750mm wide? How many bathrooms have a 1800mm area for vanity?

It would probably help to see the spaces. In some circumstances it might work to simply centre the vanity in the larger space, or to install it on one side and add shelving or a cupboard beside it. In other circumstances it might be best to go to the trouble of getting the intended larger size.

Have they been delivered? Have you asked if you can change the order? I presume from your title you ordered some sort of customisation so they are not the regular stock?

It is better to cut your losses. If you explain your situation to the supplier they may allow you to return them if you pay for freight. If not, sell the incorrect vanities and put the money towards the correct size vanities instead. They will not look right in the space and you will lose so much storage. The extra money you spend will be forgotten when you have bathrooms that work well for you and look beautiful too.

Thanks Davincicalbourne, my husband is thinking the same thing. My son is the builder so he will be able to use the incorrect ones in future on another job. We will ask the kitchen guy to make us up some custom ones to fit the space. We built a holiday house three years ago, and I ordered similar vanities for it. They worked in the space there, but will not work in the new house. I have no idea when it comes to scale. Lesson learned.

As per my earlier question about how many spaces and how many vanities do you have? Why can’t you put two 750mm vanities that you have in one 1800mm space? If budget is tight, this would work. Unless you only have plumbing for a single vanity?

That was my original idea to put one beside the other in the master ensuite, and then one each in the other ensuite, powder room, and bathroom. The bathroom will be a guest bathroom, so no need for a large vanity or storage. I have now spoken to our kitchen guy, and he can make up new units using the sinks from the incorrect sized ones. That way we can also use the tap ware that I purchased. He can match the cabinetry and bench tops for these rooms to our kitchen cabinetry, so all good, thank you. I think the plumber plumbed in two connections for the master ensuite, but the kitchen guy can work around that.

So the existing as-new cabinetry is landfill, and why wouldn't the taps you bought be compatible with anything else?

Why do you” think the plumber plumbed in two connections for the master ensuite”. ? If it is your home then I would think you would know from the plans how many basins were being installed. If there is two connections then the kitchen cabinet person should install cabinetry for two basins.

I purchased tapware that would come out of the vanity rather than the wall, so thought they may be different. He plumbed in two connections because that is the way it was on the plan. We purchased the block of land with plans....we didn't design the house. I am sure the kitchen guy can do customised cabinets using the sinks from the original cabinets. My son will be able to use the cabinets elsewhere.

Doesn't that style come with a top, not a sink that is a separate piece to the bench, so the cabinetry will still be the same size? The taps should be fine with other sinks, as long as they are standard Australian sizes. I don't see the need to pull things apart to try to reuse bits. Better to slow down and acquaint yourselves with the plans you bought, and have a good talk to the builder about what you really want.

I am hoping he can remove the sink top from the wrong size cabinets, and customise new cabinets to fit the sink top. He said he could do it, so I can only hope he is telling the truth. He is a good guy, who we have known since he was a child. So we trust him fully.

Sorry, the sink is ceramic, but we are using Silestone Gris expo for all the benchtops in the house, and "he" is the kitchen/bathroom builder. We have used him before and he is great, so I am sure he can salvage what I purchased. I am thinking he will cut the small vanity cupboard off the ceramic sink, then build a new vanity around it. He will use the Silestone for the new benchtop. There was no benchtop with the original vanity I purchased.