Kitchen sink replacement

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Hi
I am due to replace my kitchen sink. To do this I will need to increase the existing cutout by approximately 15mm. I am working with a laminated worktop

So my problem is

The current cutout is the exact same width of the cabinet below. If I try and use a jigsaw I presume the blade will either bounce of the top of the side wall of the carcass or bend the blade.

I am after some tips of how I can achieve a neat finish. Shall I cut the side wall of the carcass? There are floor carcasses either side of sink unit

Tia
 
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Can you disconnect the carcass from its adjoining carcasses and the wall, remove any kickboards/floorplinth, and slide the carcass out? Any waste pipes may easily disconnect. They're usually only a push fit.
I assume lifting the worktop is not possible.
 
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Can you disconnect the carcass from its adjoining carcasses and the wall, remove any kickboards/floorplinth, and slide the carcass out? Any waste pipes may easily disconnect. They're usually only a push fit.
I assume lifting the worktop is not possible.

Yes it's likely that's going to be my best option. Thanks
 
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If the rim of the new sink sits on top of the newly cut edge and a slightly rough cut would be hidden by the rim then this might solve the problem.

Using a small drill drill a row of holes alongside the line of the cut and then with a chisel complete the cut. Ensure the holes will be covered by the rim. Using a smaller drill with lots of holes is better than a larger drill and fewer holes.

It will leave a rough edge which will be harder to seal against moisture ingress but it does avoid the need to take carcases out which can be very difficult dependi on how they are fitted to each other and to the underside of the work top.
 
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