Welcome to CF. Where in NZ are you?
There are a number of local sailmakers who can provide excellent and personal service
(I can personally recommend Dave of Calibre Sails
in Whangarei and JF of Nautilus Sails
, but there are plenty of others), several large companies that are more commercial
(Doyles, Evolution, Lidgard, North, etc) and there are online Asian-based sailmakers (Rolly Tasker, Lee Sails, etc). Google
is your friend.
Sunbrella material is pretty standard for UV strips. You can also consider getting a furler
sleeve for use when berthing, which you hoist on a separate halyard
over top of the furled sail to provide further UV protection.
For size, if your boat
has a standard L400 rig then you should be able to get the sail measurements from the sail plan, either for your boat specifically (did your boat have its yacht manual?) or for your Lagoon 400
year model generally via Google
Material is totally up to you and your budget
, but generally Dacron is most suitable for cruising sails if durability is your primary concern. A sailmaker
can advise on cloth weights and construction methods. Most sailmaker
websites have information about all of this.