The company has just won a contact with Taylor Wimpey to look after a site where the housebuilder is building 3,000 homes on a former airbase near Bracknell, Berkshire.
The site has approximately 1,000 trees.
The housebuilder has another site near Tunbridge Wells which Longmor is also hoping to work on.
Longmor Valley was also engaged by Hever Castle before Christmas to carry out emergency work on its trees where it currently has a team engaged.
It is also picking up work as one of two approved contractors in the South East region for housing association Amicus Horizon.
Owner Dan Morris said: "We're making the trees safe and making them nice and manageable. There's trees falling over everywhere. There's a huge amount of work. I just need more fully qualified climbers."
The company is also taking on an arb apprentice and is open to training up more.
Morris runs the business in partnership with the managing director of Westland Estates James Kelly. The two entities share business space and work together on contracts.
Kelly said they were both picking up work from housing associations which were impressed by their strong health and safety credentials.
In November Westland achieved the OHSAS 18001 accreditation which added to the ISO 9001 and ISO 14001 credits it previously held.