Seeding lawn, digging flowerbeds

We have a large area of old garden to renovate. The builders have spread topsoil over the old lawn they made a mess of. We are going to seed that soon. My partner thinks we should also grass seed the area we are going to have as a large flowerbed, next to the lawn. I think this is not sensible and we should just dig the flowerbed at the same time. Advice/arbitration please!
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You can then start planting it up with any shrubs and perennials. Once that's done, you can rake and prepare the soil for the grass seed sowing because you won't be able to walk on it for a few weeks afterwards. No point sowing grass all over a new ornamental bed as it will be a waste of money/seed and be a pain to clear for ornamentals.
I would mark out the area for flower beds, and view them from all angles including the upstairs windows (assuming you're not living in a bungalow !) . Keep tweaking it until you're happy.
Spending money on grass seed just to dig it all up seems a bit daft to me
Preparation is the key.
Enjoy your new garden !
In addition - you said the builders put down topsoil. If you've had builders trampling around, the chances are that the ground is very compacted, so I'd be wary of sowing any seed until you take a look at the condition of the ground. It'll probably need some serious attention and renovation in the way of aerating/spiking, or more.
I'm in the process of doing that, as I had builders here the year after I made a new lawn, and it's never been great since.
Coupled with some more blokes doing roughcasting a year ago, the prolonged dry spell last summer, followed by even more rain than normal, and the ground really isn't in good shape!