mfw2010 writes:

We built a rear extension and once this was all completed, the garden is
now a disaster. No grass and rubble all over. I am clueless about
gardening, but very interested. I would like to clear this up myself and
regenerate grass.

Can someone advise how I do it (sorry for being daft).

1. What tools do you recommend
2. Is it is a good time to start in April? With planting the grass seeds
etc.

Since you're using gardenbanter, I'll guess it's spring where you are.
That's the second best time to plant grass seed.
Fall is the best.

Go for it. Rake up the rubble, scratch up the ground and plant the
seed. Refer to youtube or one of the thousands of sites for techniques.

There are lots of other details. Some of them aren't 100% necessary.

Minimum tools:

Lawnmower
Rake
Bag of seed


--
Dan Espen