Picture of Building A Treehouse
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Step 1: Installing The Beams

Picture of Installing The Beams
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Lag two sets of beams to the tree using a 3/4 diameter x 10" lag screw. The top set of beams will be the floor height of your treehouse. Try to to drill the pilot holes as straight and level as possible. Next install the perimeter beams to the top set o beams and square them up using the 3,4,5 rule. Once the frame is square install your floor joist.

Step 2: Level The Platform

Picture of Level The Platform
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Level your platform by getting the floor somewhat level then mount a long 2x4 on one corner and go to the next corner and level that beam and install another 2x4. The longer the level the better. Now one of the four perimeter beams is level and continue to work your way around all the sides, temporarily installing the 2x4's.

Step 3: Install The Knee Braces

Picture of Install The Knee Braces
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Once the platform is level you are ready to install the permanent braces that will support the treehouse. I used two 2x6's screwed together and cut at 45 degree angles. You can pick up some "hold down" brackets to mount to the tree with another 3/4" lag.

Step 4: Install The Decking

Picture of Install The Decking
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This is the best part of the project because you will be able to stand on the platform when this step is complete. To install the deck boards start at one end and let the boards hang over the edge long ways so you can make a clean cut with a circular saw at the end. Use a carpenters pencil for spacing your boards. When you get to the tree, use a compass with a pencil spaced about two inches out so to give room for the tree to grow and move in the wind.
First off... Fantastic work!

I'm curious what the dimensions (thickness/width/length) are of the lumber you used, specifically for the beams and the platform. We'd like to build an exact replica of your treehouse as it seems to be an ideal size.

Thank you for sharing!

I absolutely love tree houses! Whether it is real solid wood in real life, or virtual wood in a game. If I ever get a tree big/strong enough to build a tree house such as this, I would! Thanks for the tutorial!


bloomie972 (author) 1 year ago
Thanks for all the feedback and compliments.
Victor8o51 year ago
It looks incredible, great job!
Niiiiiiiiiiiiiiiiiiiiiiiiiice !!!…

You make me want to live on a tree !…

Thanks for posting.
Amazing job.
stevedawg2 years ago
I've been wanting a treehouse for a long time really cool thanks for sharing
bloomie972 (author) 2 years ago
@ratmax @stefwill
You could always use an old utility pole. It would be easier to work on for one thing. :-)
stefwill2 years ago
Fantastic! Now all I need is a tree!
dirtrider942 years ago
That is awesome!
rozenbaum962 years ago
ReyKay2 years ago
Best work I've seen.
coco luva2 years ago
Good job
ratmax002 years ago
Nice work! Now to get the skimpy trees outside to grow faster so I can build one.
bloomie972 (author) 2 years ago
Thank you. I got the brackets at a lumber and building supply store called Stock Lumber. I had to shave off about a 1/4 of an inch on each side of the knee brace to get it to fit and I mounted them with galvanized washers to get them straight up and down and a 4" long 3/4 lag screw.
thawk2 years ago
@bloomie972 love the tree house.. I'm in the middle of building one my self. i was wanting to know where did you get your knee brace brackets?
Lforador2 years ago
That is the coolest treehouse ever
Best first instructable
bloomie972 (author) 2 years ago
I understand where you are coming from. But there is no sheer strength in lashing. In other words, you could make your lashing as tight as possible but with all the weight of a treehouse, let alone people in it, how are you going to keep it from sliding down the tree? Believe me, when your kids and all their cousins and friends are up there, you want to know that you built the treehouse as solid and sturdy as possible. The tree will heal around the lag screws and this won't hinder the growth of the tree if done properly. If I knew this was going to damage the tree I would not have built it. This tree makes our backyard and provides invaluable shade as well.
dr.mbogo2 years ago
Looks like I have some problems replying to comments. Well, never mind that.

Rope is good. Rope of natural materials is better. Anything that has some give in it and does not puncture the tree. I would even go so far as to put some padding between the tree and the frame, something like a piece of carpet or thick piece of leather to keep the bark from rubbing off.

My point about trees being living things is that driving a nail into a tree is about the same as stabbing people, lashing with a steel wire would be analogous to strangling.
suhyun2 years ago
Cool :-)
dr.mbogo2 years ago
Please lash the treehouse onto the tree. Using nails or screws is something trees do not like, they are living things, after all.
How do you lash it? Rope?
bstanfield12 years ago
That is one epic treehouse!