When including any measurements, you must provide them in metric. There is no problem using feet and inches, provided you include the metric equivalent alongside. This is a legal requirement and not something that you can ignore.
You should also indicate how long your estimate is valid for. There is a good reason for this - your prospective client's garden will continue to grow until such time as they employ someone to do the work. Overgrown gardens became more overgrown as time goes on. This may mean that the job you initially thought would take you a half-day will now take a day. There will also be more cuttings, trimmings, weeds and so forth to take to the dump, which means increased tipping charges.
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