Best Garry's Mod Building Addons 2026 – Top Tools Builders Use (Wiremod, Precision Alignment, Advanced Duplicator & More)

Best pick for 2026 best building addons / tools that many builders use constantly. Looking for the best Garry's Mod building addons in 2026? Whether you're a beginner or a seasoned builder, these tools are essential. From Wiremod to Prop2Mesh, I've tested them all – here's my personal take.

Top tier: Wiremod It is impossible not to mention wiremod, wiremod is the basis of all, all the buttons, all the screens for debug it's all there. While it takes some time to learn, however their community is quite helpful and it's everywhere. It's almost impossible to find a sandbox server nowadays without one installed. It is also one of those addons that may be set as a requirement to other projects. Essential.

Image credit: Marcsello blog In wiremod you can find:

- Expression 2. Typescript like language. Combined with I/O controls it became essential for many builders. You can basically create your own chips to control mechanisms or do anything what you want.

- Gates. "Logic" programming language. Basically IRL schematics. Be ready to create your first motherboard with it.

- I/O controls (wire tool). Let's you connect inputs / outputs. Like imagine a wire coming from one point to another that transfers data. There's varios data types, as an example it can transfer boolean (true/false (as 1/0) ), numbers, tables, arrays & more.

- Improved hoverballs . Much better version of what we have in default gmod. While functionality is similar, the ease of use is just so much better.

- Improved wheels . More models, easier setting up, more control over the actions.

- Rangers (laser that measures distance). Along with E2 (Expression 2), you can build lots of funny stuff - claymores, AEBs and whatever else you can imagine.

- CPU & GPUs. Actual assembly. For true geeks. Expect less tutorials and most of the time knowledge is passed by certain people to another group of people. Be lucky to find those in the wiremod discord. A part of default wiremod now. Be aware of underlying potential security issues, the reputation wasn't very good and it is barely maintanable.

- & much more (click to see one of the cool examples where one of the builders managed to link wiremod to real life)

Be aware that wiremod devs quite recently (on the gmod time scale) made canary version of wiremod, which means that quick fixes or just updated in general get much faster to the user, but expect instability. Recommended for absolute geeks.

It is also quite recommended to use their official wiki that you can find on their github . Do not use outdated tutorials, while sometimes they may be helpful, they can teach you many outdated stuff and it will take extra time from you to relearn certain features.

Precision alignment (PA) What kind of building / engineering are we expecting if props you placed are misplaced and aren't perfectly set in place? This tool allows you to place props / entities extra precisely. You can mirror, rotate, dupe or even set constraints, just like in your other favorite sandbox games. While there is a learning curve, there are many tutorials up on the youtube and they practically never get old.

With this tool people make different suspensions or parts that love to move like mud flaps.
Check out this video to see what is possible with PA:

Advanced Duplicator 2 (AdvDupe 2) A modern and most supported way to dupe and paste your dupes. Forget about built in duplicator, this one let's you dupe by zone, precisely place dupes at any incremental angle you want (-45, 90 etc.). And there are expert features that some people would like. Remember, with great networking speed comes great responsibility!
Click clak

StarFall Extended Also known as SF, StarfallEx, Starfall. Another E2 like system, but lua. More versatile than E2, but doesn't provide what wiremod has (and there is no point), so they work together seamlessly. There are built in wiremod libraries within the SF. Generally considered to be mostly for people who already have coding experience in the past.

By the way you can download and check out SF in here: click

Drawing screen made in SF by Asplur Prop2Mesh This changed building industry forever. Thanks to shadowscion, we have this wonderful tool that helps with perfomance on the client side, basically getting from 5 fps to 150 fps. This tool does what it is said in the description - converts prop to mesh. Which means you can take 1000 props, convert them to mesh(single model) and hide the props (make them transparent with color tool). This significantly reduces render time, so if it is a large appartment building, complex contraption then this is a tool for you. Please note that props with complicated textures (like original half life 2 assets) won't have the textures set up, unless you change the texture to something more basic. Other props that are made for building like SPROPS or original PHX props - those work great.

Another possibility with Prop2Mesh is 3d model -> gmod. Imagine you can take some public 3d asset and get it inside the Gmod. Many people build planes, ships, tanks, cars this way.
Please note that this tool DOESN'T generate collision mesh or hitbox .

So say you don't actually need some small details prop collision, feel free to check in the settings within the tool to delete props after mesh is finished.

You can download it here (click)

Prop2Mesh example taken from workshop Fin 3 Continuation of the legenday fin 2 addon. Fin 3 is a tool intended to create a "close enough" simulation of airflow over an airfoil in Garry's Mod.

Basically a must have for the plane enjoyers or those that want to have tremendous down force on their newly built car with ACE.

Green arrows show direction of the force that acts upon a plane. Image credit: Cheezus But this is not all! There are way more addons that deserve to be in this article, but I do not want it to be extremely long. Most of the addons you can find in our collection here:
https://steamcommunity.com/sharedfiles/filedetails/?id=3282568819
This article has potential to grow – but not today 😉