Im after some advice regarding a lawn issue.
A customer had spoken to me regarding their front lawn that really struggled to put on any growth at all even during spring time.
I suggested that because the house is a new build, although built a number of years ago now that it probably has rubbish under the soil. The customer explained that they had the garden dug up and tonnes of fresh top soil put down by a landscaping company.
I suggested that the lawn may be compacted as the soil was put down in layers.
So we aerated and scarified the lawn and put down some grass seed (supplied by the customer from a friend who works on the golf course). We topdressed the lawn and after a couple of weeks the grass had taken and looked good. (This was all done last May).
However the lawn now looks like it does in the pictures. Customer said it started to go down hill in the autumn and has got worse and worse.
There are peck marks in the lawn but no other evidence of chafer grubs and some of the areas I dug up still seemed to have roots.
The customers wife also told me that her husband had put down a 3 in 1 lawn weed and feed in the autumn but I suspect this was done when the lawn started to turn.
The back garden is only a few feet away from the front and is absolutely fine.
Any advice on what may be the issue would be vert helpful.

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"we only topdressed with compost when the seed went down.".
Is that the compost that is sold as soil improver at the household waste recycling centres and green waste disposal sites that is made from shredded garden waste?
https://www.severnwaste.com/composting/applications-and-availability/
Hi James, it's difficult to give you an answer to this without being there and having a good look for myself.
You could try sending a soil sample off for analysis. Personally, I would go for the full monty and include soil texture, CEC, micronutrients etc. This will give you a better idea of what you're working with.
Once you are out of frost season; scarify it well, seed it again and topdress it with a really good lawn top dressing from a top dressing supplier (Field Compost are great). Once established, give it 2-3 applications of organic feed or seaweed liquid. Make sure they water it well in the lead up to summer. Assuming there's nothing wrong with the soil analysis, I suspect it just needs some nurturing.
It's probably a combo of crappy topsoil to start with then the 3 in 1 treatment finishing it off. Maybe try killing off the remnants of lawn, rotavating in soil improver and reseeding.