Stop Cutting Form Boards
Fix gaps, form around obstacles, and keep your job moving - no tools required
Starter Kit - Coming Soon to Home Depot
4" Starter Kit
Built from heavy-duty steel for concrete professionals, FormExtenders eliminate cutting, reduce waste, and solve layout challenges on every job. Fits over standard 2x4 lumber.
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Must-Have Tool For Concrete Contractors
Stop wasting time and money cutting boards to fit. If you're working around sprinkler heads, pavers, deck posts, or plastic edging, FormExtenders are the solution that keeps your crew moving and your schedule on track. Save time, cut material costs, and reduce hassle on every pour!
Made for Quality
- Built IN the USA
- Made from 18-gauge galvanized steel
- Designed for STRENGTH, DURABILITY, and corrosion RESISTANCE
- Patent pending tension fit DESIGN that requires NO tools, stakes, or nails
Made for Business
- Set forms FASTER and with less HASSLE
- To remove, they just SLIDE out and are READY to use again
- Get the job DONE SMARTER, not harder
- IMPRESS clients and INCREASE profitability with a tool that pays for itself FAST!
How FormExtenders Work
Quick and Easy Setup
Grab the nearest board that's shorter than your required length. Grab a FormExtender for the remaining length. Done. No cutting. No measuring. No searching for exact-fitting forms.
Effortless Precision
FormExtenders automatically produce STRAIGHTER, STONGER forms. You focus on delivering quality concrete work. Let the extender handle the gaps.
No Tools or Nails Required
The innovative tension fit design locks into place. NO need for stakes, nails, or extra tools. When it's time to strip the forms, they slide off clean and are ready for the next concrete project.
With FormExtenders, you can streamline your setup and finish jobs FASTER, with fewer materials wasted, and without sacrificing quality. It’s a SMARTER way to form concrete, SAVING you time and INCREASING your efficiency on every project.
Save Time. Cut Waste. Pour More.
FormExtenders give crews the flexibility to handle larger, more complex pours without extra setups or wasted material. For contractors watching their time and budget, it's a small addition that delivers a real difference on every job.
Check Out Our Kits
Common Questions
Frequently Asked Questions
What are concrete form extenders?
Concrete form extenders are heavy-duty steel concrete forming tools that slide over the end of a form board to fill gaps without cutting. They lock in place using a tension fit design. No stakes, nails, or extra equipment needed.
How do concrete form extenders work?
FormExtenders slide directly onto the end of your existing form board and extend the length to fill whatever gap remains. The tension fit design holds the extender firmly in place during the pour. When the job is done, they slide off and are ready to reuse on the next job site.
What are the benefits of using FormExtenders on a concrete project?
FormExtenders save time, cut material waste, and improve efficiency on every pour. Instead of cutting boards to fit, you grab the nearest short board and drop in a FormExtender for the remaining length. The result is straighter formwork, less scrap, and a faster schedule from setup to pour.
What size lumber do MudMixer FormExtenders fit?
The 4" Starter Kit is designed to fit standard 2x4 lumber. This is the most common board size used in residential concrete forming systems. They're built for flatwork construction applications like patios, sidewalks, driveways, and hardscape borders.
Can form extenders be used around obstacles on the job site?
Yes. FormExtenders are a practical solution for forming around fixed obstacles like sprinkler heads, pavers, deck posts, and plastic edging. Instead of removing the obstacle or cutting a board to fit around it, you use a FormExtender to bridge the gap and keep your layout intact. They work well alongside other concrete accessories and rebar accessories already in your workflow.