Engineered wood not level

I had a company fit this room with engineered wood a couple of years ago. The floor wasn't level so the used levelling compound on one half but didn't bother with the other. They thought the other half was level enough to go straight onto. This is not the case as the finished job has deflection in certain areas (I've marked them in red on the diagram).

I've put together a diagram to help illustrate and also a photo of what I've got.



My main question is around putting this issue right. Is there a way to "unclick" the floor (the boards are Elka so use a their unilic system) in order to not have to take all of the skirting/architrave off for the whole room? Or is there a way to only take off some skirting in order to go to the concrete floor where it can be re levelled and then relaid once it's gone off? All does the whole lots need to come up and be relaid therefore needing the skirting to come off for the whole room too? Even if it means I need to sacrifice a board or two, that's fine.

Thanks for any help/advice you can give.

Why has it taken 2 years for you to notice or want to do something about it?

What was it like when it was first fitted?

Why didn't you complain to the company when first fitted?

Andy

Thanks Andy, all noted. Lots of reasons why - I won't go into on here but it never happen I'm afraid

When it was first fitted it was exactly the same as it is now. The good half is perfect and is very sound and stable.
The problem half is probably only a few mm's out so it didn't seem a huge problem at the time (one of the reason we didn't complain) but over the last few months and year it's started to wind me up as we're using that room more now and it's more noticeable.

I know what you mean about complaining (and we should have done) but we're nice people and don't like making a fuss/causing a problem. I know that it's not a good enough excuse not to complain but there's not really a lot I can do about it now I guess that just try to get it sorted somehow.

Thanks.

Could anyone give me some help with this please? Really appreciate any help and advice.

Yes it can be UN clicked but you will have to take some skirts off. you will need to take a lot up to check levels and try to fit it but can be done mate.

Yes always start at one side and UN click one row at a time. Use post its to label each row and piece ( first row first piece is 1a then etc)
Vacuum before and all the edges before they go back together.

If it was a square room, then you'd get away with taking the skirting board off of 2 walls, and then unclick the boards till you reach the section you want, but with your room, I reckon that you'll just need to have the courage to clear the room, take the skiriting boards off the wall by the first problem, and then work progressively till you get enough taken up to level the floor sufficiently. What underlay was used. If it was a thin underlay, then you might be better off lifting the whole room, putting down 5mm fibreboard, and then relaying everything, and that may allow you to do slightly more basic job of levelling. You're going to want a feather edge leveling compound, and you may need to sand if to get the joints flat. SLC doesn't level as much as it should, and even feather edge will leave a ridge. Do you have any boards left over in case of damage, and you've going to have to mark and stack the boards carefully, so that each row goes back down in the same manner.