How do we find out the value of a piece of garden??

[PacificDogwood]

Our lovely neighbout is moving . She is selling her large family-sized house to down-size.
We would be keen to buy part of her garden. There is quite an obvious demarcation line between her "formal" garden/driveway around the house and the large lawn with huge trees/shrubs which is the bit we are interested in.
We have discussed this with her and she is up for it in principle. Our problem is that we have no idea at all how much to offer her. We do not even know the size of it as the EA said they are only interested in the size of the house and the size of the plot is of no interest ??
Any ideas how to go about this? Do we ask our own surveyor to come and give us an estimate? Is there such a thing as a "standard rate" for garden?? It is large enough to build a house on, but has no planning permission and I am not sure one whould get one.
Thanks for any advice.

Well it depends entirely on: location; access; legal constraints on the land and what's actually there. It's about £7k an acre on average but it does depend on whether it has building potential. Is the land abutting against yours? If so it's fairly simple, you make an offer, if she accepts your solicitor will apply to the land registry to demarcate the bit of land and transfer it's ownership to you.

Takes a few weeks that's all.

Thank, WMMC, yes it is next to our plot of land which is rather small compared to the size of house (bungalow) as the neighbour's garden used to be part of this property, IYKWIM.
A surveyor had a look at it today and will come back to us with a value tomorrow. He measured it as 20x30 meters give or take a few shrubs. How does that compare to an acre ??
It is currently laid to lawn with huge trees and shrubs around it, so is not brownfield.

You need this

You will have very few problems in this situation, it's very straightforward. Be sure you include in your calculations the price of a boundary wall or fence

600 Square Meters = 0.1482632288802992 Acres btw

Thanks for calculator, that's genius!
600 sqm = 0.15 acre (roughly) but that seems absurdly cheap at £7k/acre?? What have I got wrong there?
I'll stop pestering you soon, I promise

Well it really depends - residential land is different you see. What county are you in?

Lanarkshire in Scotland, semi-rural small town about 15 miles from Glasgow, Central Belt.

See here

Argh you didn't mention you were in Scotland - I'm not sure it's the same up there! Hang on....

www.uklanddirectory.org.uk/land-prices-scotland.asp

Thanks for that! I will have to look at it in more detail.
So there seems to be a difference in price for fields, gardens and building plots with/without planning consent, yes?
Thanks again for taking the time .
We'll wait and see what the surveyor says...

Quick update: we did not get it . Local property developer swooped in and bought the whole thing for silly loadsamoney.
Sigh.
Oh, well, I suppose we will have new neighbours when he has finished building on MY LAND!!!

Thank you for help. I suppose I have learnt a lot in the whole process .

your help, even. Oh dear.