gizmo - will this bit of glass cover an existing wooden top or will it be the top? Cover glass will not have to be toughened or safety glass as it'll gain support from the wooden top below - a bit of thick 'plate' glass can be cut (& edges ground) locally. Quite a common added detail to furniture tops.
If not safety glass, what happens when someone drops a cup on the table and then one of the shards goes through their wrist, or flicks up into their eye?
^woody^ - I think I'd be more concerned about the shards of cup 'flying through the air'. My view is that because the glass is supported completely across and under it poses little or no risk of shattering and of lifting and flying around; it's likely only to crack. Never a risk on my 'Old Mum's' LLoyd Loom glass (plate) topped furniture.
Now, an unsupported, shelf like bit of glass, that's a different story.
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local