My co. bought office chairs from ikea and they charge us 5% from total purchase price for installation services. Should be the same case for other furnitures as well but i know they also charge extra if need to drill holes on the wall.

Ikea website did mention the price, which I don't remember how much.

If you check on ikea's website, the installation is for non-drilling ones only. I guess that drilling the wall need some kind of expertise and a different tool? But their policy is like that. At least with you hiring them to do it all, any problems, can revert back to them to settle as Ikea stays by it's warranties.

Sorry i didn't mean to make it mean that way.

What i mean is that, since installation is done by their contractor, any error or mistakes done during installation can be claimed.

If for example, you are putting a screw into one of the cabinets and you accidentally screw it sideways and hence created a defect, ikea will not warranty that as the defect is done by you and not their appointed installer.

I hope you get what i mean. The usual warranty still applies.