How do I repair this lawn?

wwwqi

Hi All

First timer here. Please be gentle. I recently finished renovating my home and the lawn was all dug up because they had to lay drainage, plus all the trades needed to drive on the lawn and park for about 6 months. 

Finally a landscaper gave me a quote to restore lawn and said I needed to top dress. He put on all this sand and told me to wait till it's warmer but all that's happened is that weeds keep popping up. I am wondering should I sow grass seeds? Which variety? Need I use round up first to kill off weeds?

I live in a flood zone in Epping if it helps? 

MitchellMc

Welcome to the Bunnings Workshop community @wwwqi. It's great to have you join us and many thanks for your questions.

I would start with a clean slate and apply a weed killer to the area removing all the weeds and grasses present. 

Here's a couple of helpful step-by-step videos on How to grow lawn from seed and How to lay instant turf which I trust you'll find of assistance in this process. 

You might be interested in reading this discussion How to improve your lawn this Spring which has some useful information within it.

Please let me know if you need further assistance or had any questions.

Mitchell