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what are the guidelines for trees? Must you have a specific number? If it's a new planting is there a caliper inch requirement?
I deal w/a ton of different HOA's all over Austin & surrounding areas.
Normally you are required to plant native or adapted trees, such as found in the City of Austin's "Grow Green" publication.
There has been a moratorium on planting Live or Red Oaks in some areas (Lakeway for example) due to the spread of Oak wilt.
The number/size of trees varies greatly, but is typically tied to lot size, two trees at 2" caliper being a usual minimum if the lot has no native trees in the front yard. HOA's will often require an extra tree on a corner lot.
For other subdivisions (like Spanish Oaks in Bee Cave) the number of trees is based upon the square footage of "building envelope" area. (Building envelope area = house footprint+driveway+pool etc.) I don't recall the exact numbers off the top of my head, but something like 1- 6" caliper tree is required for every 2K SF of building envelope area & you must round up. You must also have ornamental trees (redbud, yaupon, etc) planted in numbers according to the SF of building envelope area.
Needless to say, Spanish Oaks can require you to have 75-100K of just trees in some instances.
New homebuilders that don't do their homework & throw a 40-50K number for a landscape allowance are often in for a rude awakening. Sucks to be in those conversations.... they want to shoot the messenger.