I've raised £5000 to Help fund a garden makeover

OK so here we are asking for a bit of help. We are a complicated family of 5. There is Mum (Sarah), Dad (Martin) and three boys (Nathan, Connor and Dillan). Martin is a full time wheelchair user. Nathan is your typical moody teenager. Connor is a 13 year old boy who struggles with anxiety, emotional dysregulation and dyspraxia. Dillan is a loving 10 year old with a rare syndrome, it causes him to have learning difficulties, short stature and microcephaly amongst other things.
We were lucky enough to be able to move into a housing association 3 bedroom adapted bungalow in Oct after struggling in a teeny 2 bed one previously. We have worked hard and used all our savings to get the place decorated and carpeted but there is one area we are really struggling with which is the garden.
At the minute the garden is completely unaccessible for Martin due to the mass of grass and uneven ground. The fence is falling down, there are lots of weeds and it just isn't a usable space.
The garden is very important for both Martin and Dillan. Dillan is unable to go and play out in the street with the other children so he needs a space where he can play. Martin loves wildlife and plants but struggles to access public areas.
We aim to raise enough money to get a new fence to make the garden safely enclosed, pave over the majority of the grass to allow Martin access around the garden and let Dillan ride his little cars, plant some wildlife attracting bushes and trees, install some sensory equipment for Dillan to play with and create a relaxing den area for Connor to retreat to when he is struggling emotionally with his anxiety.
Unfortunately due to Sarah struggling to meet everyone's care needs she is unable to undertake this work alone so we are going to have to pay someone to do this work for us. That sadly is the reason we are asking for help we just can't manage this alone.