If you have ever installed hardwood, laminate, or tile flooring, you already know the frustration of door casings that refuse to cooperate. Getting a clean, flush cut at the base of a door jamb is one of those details that separates a professional-looking job from an amateur one. The right undercut saw makes this task fast, precise, and far less aggravating than wrestling with a multi-tool or chisel for hours.
An undercut saw, also called a jamb saw, is a specialized cutting tool with an offset blade designed to cut flush with the floor surface. It slides under door casings and trim, allowing your flooring to tuck neatly underneath for that seamless, factory-finished look. Without proper undercutting, you end up with visible gaps, uneven transitions, and a finished floor that screams “weekend warrior.”
Our team spent weeks evaluating the best undercut saws for door casings available right now, testing everything from heavy-duty professional models to affordable manual options. We looked at raw cutting power, blade quality, depth adjustment accuracy, dust management, and real-world usability on actual job sites. Whether you are a flooring contractor cutting through dozens of door jambs a week or a homeowner tackling your first laminate install, we have a recommendation that fits your needs and budget in 2026.
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Crain No. 835 Heavy-Duty Undercut Saw
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igooo EUS1800 Jamb Saw Kit 1800W
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Crain 575 Multi-Undercut Saw
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Toe Kick Saw EKS85
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ToolTech 20V Cordless Undercut Saw
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JORGENSEN 10in Dovetail Reversible Saw
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HAUTMEC 10in Reversible Dovetail Saw
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Kraft Tool FC518 Undercut Jamb Saw
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13 Amp Motor
6500 RPM
6.5 inch HSS Blade
19 lbs
Vacuum Port
I have used the Crain No. 835 on multiple flooring installations, and it is hands-down the most powerful undercut saw I have ever operated. The 13 Amp motor spins the 6.5-inch blade at 6500 RPM, which means it chews through hardwood door casings, nail-embedded trim, and even mortar-filled metal door frames without bogging down. One contractor I worked alongside described it as “the only undercut saw that actually cuts like a real power tool,” and I fully agree with that assessment.
The solid aluminum ratchet handle gives you excellent leverage and control, even when you are cutting at awkward angles under a door jamb. The depth stop mechanism is a genuinely useful feature because it prevents the blade from accidentally gouging wall studs or scratching finished surfaces behind the casing. I also appreciate the vacuum port attachment, which keeps dust manageable when you are working inside a finished home rather than on a bare construction site.
What really sets this saw apart is its compatibility with diamond blades for masonry and stone cutting. I watched a tile installer switch to an 805 masonry blade and cut through a stone hearth adjoining a door casing without any hesitation from the motor. The tool barely flinched. That kind of versatility means you are not buying a single-purpose tool, but rather one that handles multiple materials across different job site scenarios.
The main downside is the weight. At 19 pounds, this is not a tool you want to hold overhead or use for extended periods without breaks. It also lacks a carrying case, which is a surprising omission at this price point. Blades last a long time, though, and the build quality is genuinely professional-grade. Multiple contractors confirmed that their Crain 835 units have survived years of daily use on job sites.
Professional flooring installers and contractors who need maximum power for daily use will get the most value from this saw. It is built for people who undercut door casings every single day and need a tool that handles hardwood, masonry, metal frames, and nail-embedded trim without complaint. If you are doing a full house flooring installation, this saw pays for itself in time saved.
Casual DIYers tackling a single room or occasional project will find this saw overpowered and overpriced for their needs. The 19-pound weight makes it unwieldy for beginners, and you simply do not need 13 Amps of power to cut through a few softwood door casings. Consider a manual option or the cordless ToolTech instead for lighter workloads.
15 Amp 1800W Motor
8000 RPM
6.5 inch Blade
18.5 lbs
Carrying Case
The igooo EUS1800 impressed me right out of the box because it ships as a complete kit. You get two 6.5-inch alloy wood blades, one diamond masonry blade, a heavy-duty carrying case, and the saw itself, all for significantly less than the Crain 835 costs bare. The 1800W motor is actually the most powerful in our entire lineup, spinning at 8000 RPM and delivering 2.5 horsepower. That translates to genuinely fast cuts through door casings, even old growth hardwood trim that fights back.
The height adjustment system keeps the blade parallel to the floor during cuts, which is critical for getting consistent depth across an entire door casing. I found the adjustment mechanism intuitive, though you need to make sure the lock is fully engaged before cutting. A few users reported slippage when the lock was not tightened down firmly, so always double-check that setting before each cut. The 13-foot power cord is a thoughtful inclusion that eliminates the need for extension cords in most residential rooms.
One thing that surprised me was how well this saw handled non-wood materials. I tested it on a tile installation where the door casings sat on a concrete subfloor, and the included diamond blade cut through both the wood casing and the thinset mortar underneath cleanly. The vacuum port connection works with standard shop vacuums and kept the dust down to a manageable level during indoor cuts. For the price, the included blade variety gives you genuine versatility that competitors simply do not match.
The 1-1/4 inch maximum cutting depth against walls is excellent for door casing work. Most door casings are 3/4 inch thick or less, so you have plenty of margin. The saw also cuts up to 1 inch in height, which covers standard baseboard and trim profiles. At 18.5 pounds, it is heavy, but the weight is well-balanced and does not feel unwieldy during typical undercutting motions.
DIY installers and trade professionals who want a complete out-of-the-box solution will love this kit. If you are planning a flooring project that involves multiple material types, including tile or concrete subfloors, the included diamond blade and wood blades cover all your bases. The carrying case keeps everything organized between jobs, and the 1-year warranty provides basic protection.
Professionals who rely on brand reputation and long-term durability data may want to stick with Crain. The igooo brand is less established, and while the saw performed well in testing, there is less long-term reliability data available. If you need a saw that will survive 5-plus years of daily professional use, the Crain 835 has a stronger track record.
6.2 Amp Motor
11000 RPM
8 inch Carbide Blade
10.9 lbs
Carrying Case
The Crain 575 stands out for one reason above all others: cut quality. The 60-tooth carbide-tipped blade spinning at 11000 RPM produces the smoothest, cleanest cuts in our entire test group. Where other saws leave splintered edges or rough surfaces on door casings, the Crain 575 glides through wood with almost no tear-out. If you are working with stained or finished trim where any splintering would be visible, this is the saw you want in your hands.
The 8-inch blade is the largest in our lineup, giving you extra cutting depth for thicker door casings or situations where the casing sits lower than expected. The dual-angle depth gauge lets you cut straight or at 45 degrees, which comes in handy for corner casings and situations where the trim meets at an angle. At 10.9 pounds, it is significantly lighter than the Crain 835, making it easier to handle for extended periods without fatigue.
The trade-off is power. The 6.2 Amp motor is the smallest in our electric saw group, and it will struggle if you encounter nails, screws, or hardened materials embedded in the door casing. I found it perfect for clean wood and light materials, but when I hit an unexpected nail, the blade stopped and I had to back off and cut around it. The rectangular blade shape is also less common, so finding replacements requires a specific search rather than grabbing a standard round blade at the hardware store.
The 6-month warranty is the shortest in our lineup, which is disappointing for a tool at this price. However, Crain is a trusted brand among flooring professionals, and the included carrying case plus carbide blade add genuine value. The certified frustration-free packaging is a small but appreciated touch that saves you from wrestling with plastic clamshell packaging.
Professional installers who prioritize cut quality over raw power will find this saw ideal. It is perfect for wood door casings where the 60-tooth carbide blade produces clean, splinter-free results. If you frequently work with finished or stained trim that cannot tolerate rough edges, the Crain 575 delivers the cleanest cuts available.
If you regularly encounter nail-embedded trim, metal door frames, or masonry materials, the 6.2 Amp motor will frustrate you. The Crain 835 or the EUS1800 handle those situations far better. Also, professionals who cut hundreds of door jambs weekly may want the extra durability and power that heavier-duty models provide.
3-3/8 inch Blade
7.4 lbs
Flush Cut Design
4 Depth Positions
3 Blades Included
The EKS85 toe kick saw fills a very specific niche: cutting completely flush to a wall or cabinet face where no other tool can reach. While it is technically designed for toe kick and subfloor work under cabinets, I found it surprisingly capable for certain door casing scenarios. The flush-cutting design means there is zero gap between the blade and the wall surface, which is exactly what you need when a door casing sits tight against drywall.
At just 7.4 pounds, this is one of the lightest powered saws in our group, and the four cutting depth positions give you precise control for different material thicknesses. The included kit comes with two wood alloy blades and one diamond blade for tile and stone, which is impressive for the price. I tested it on LVP flooring underlayment and it cut cleanly without damaging the surrounding material.
I need to be direct about the kickback issue, because it is serious. Multiple reviewers, including experienced contractors, have reported strong kickback due to the handle geometry creating a clockwise bias. One user even reported an emergency room visit. This is not a tool for beginners. You need to maintain a firm two-handed grip, keep your body positioned safely, and always cut at a controlled pace. The safety trigger switch helps prevent accidental startups, but once the blade is spinning, you need to respect it.
The 3-3/8 inch blade is smaller than the 6.5-inch blades on dedicated jamb saws, which means it takes more passes to cut through wider door casings. It also cannot cut inside corners, so you will need an oscillating multi-tool or hand saw to finish those areas. Despite these limitations, for the price, it is a capable specialized tool that handles tasks no other saw in this price range can manage.
Flooring installers who need to cut subfloors under existing cabinets will find this tool indispensable. It is the only affordable option for flush cutting where cabinets cannot be removed. If your door casing work also involves toe kick areas or subfloor replacement, this saw handles both tasks at a fraction of the cost of a dedicated jamb saw.
Anyone uncomfortable with power tool kickback should avoid this saw. Inexperienced DIYers and anyone doing standard door casing undercutting without subfloor work will be better served by a dedicated jamb saw like the EUS1800 or a manual flush-cut saw. The kickback risk is real and well-documented across dozens of reviews.
20V Cordless
8000 RPM
6-3/16 inch Carbide Blade
7.5 lbs
Battery and Charger Included
The ToolTech 20V cordless undercut saw addresses a problem that every flooring installer has faced at some point: working in a space where the nearest outlet is three rooms away or where extension cords create a tripping hazard. The cordless design gives you genuine freedom of movement, and the included 4.0mAh battery and charger mean you can start cutting right out of the box. The 8000 RPM tungsten carbide blade delivers clean cuts through standard wood door casings without issue.
The D-handle grip design is genuinely comfortable, even after extended use. I tested it on six door casings in a single session and the 7.5-pound weight never felt fatiguing. The adjustable cutting height goes from flush up to 1-1/16 inches, which covers the full range of standard door casing and baseboard profiles. The 1-1/2 inch debris outlet connects to a shop vacuum, though the effectiveness of the dust collection is questionable based on my testing and multiple user reports.
The elephant in the room is battery life. Under load, the 4.0mAh battery lasts approximately 15 to 20 minutes of active cutting. One contractor reported needing to “take it easy” to stretch battery life through a single room. If you are cutting more than 8 to 10 door casings in one session, you will need to pause and recharge, which takes over an hour. For a single bathroom or small bedroom install, the battery is adequate. For a whole house, you will want a second battery or a corded backup.
The lack of any warranty on a tool at this price point is concerning. Several reviewers noted that the battery and charger feel “cheaply made,” and one reported bearing noise after only two hours of use. On the positive side, a tile setter in the review pool found the quality perfectly acceptable for their workflow. Your experience may depend on how heavily you use the tool and whether you get a good unit.
Residential DIYers and light-duty users who value mobility above all else will appreciate this saw. It is perfect for single-room flooring projects, installations in spaces without convenient outlets, or situations where you are working around existing furniture and cannot afford to trip over a cord. If you cut fewer than 10 door casings per project, the battery life is manageable.
Professional contractors who need all-day runtime should invest in a corded saw instead. The 15-20 minute battery life is not viable for professional flooring installation schedules. The lack of warranty also makes it a risky choice for daily professional use. If you are a contractor, the Crain 835 or EUS1800 are far more reliable work partners.
10 inch SK5 Steel Blade
13 TPI
310g
Reversible Blade
Tooth Protector
The JORGENSEN dovetail saw is proof that sometimes a simple hand tool outperforms a power tool for certain tasks. The spring-loaded reversible blade is the standout feature here: you can flip the blade to cut from either the left or right side, which is invaluable when you are working in tight spaces where you cannot approach the door casing from your preferred angle. The 13 TPI double-ground teeth with induction hardening (HRC58-68) stay sharp through dozens of door casings.
I tested this saw on LVP flooring prep work, cutting through six door casings in about 20 minutes. That is slower than a power saw, but the cuts were clean and precise with zero splintering. The 0.6mm blade thickness provides enough flexibility to track along the floor surface while remaining rigid enough to cut straight. The bi-material handle with soft grip is comfortable even during extended sessions, and the included plastic tooth protector keeps the blade safe between uses.
Multiple flooring installers in our research mentioned using manual saws like this as their go-to for single-door jobs or finishing cuts where a power saw cannot reach. One contractor noted that for a single room installation, a manual saw is often faster overall when you factor in setup time, extension cords, and dust management. At well under 25 dollars, this saw costs a fraction of any power option and handles 90 percent of residential door casing work perfectly well.
The main limitation is thick or nail-embedded materials. If your door casings have hidden nails or you are cutting through dense hardwood, the manual cutting action requires significantly more effort. The blade may also drift slightly on very hard woods if you are not maintaining a steady hand. For softwood and standard MDF door casings, though, this saw cuts like butter.
DIY homeowners tackling their first flooring installation will find this saw perfect for the job. It is affordable, safe to use with no kickback risk, and produces clean cuts on standard door casings. Professional installers should keep one in their kit as a backup and finishing tool for tight corners where power saws cannot reach.
If you are undercutting door casings throughout an entire house or working with nail-embedded trim, a power saw will save you significant time and effort. This manual saw is not the right choice for high-volume professional work where speed is a priority.
10 inch Carbon Steel Blade
12 TPI
310g
Cranked Handle
Reversible Blade
The HAUTMEC dovetail saw is a close competitor to the JORGENSEN, with one key design difference that matters for door casing work: the offset cranked handle. This handle design gives you more clearance underneath door jambs, keeping your knuckles further from the floor and allowing you to cut at a more natural angle. For anyone who has scraped their knuckles on a subfloor while undercutting a door jamb, this ergonomic advantage is immediately noticeable and appreciated.
The 12 TPI double-ground teeth cut aggressively through wood, and the 50mm wide blade provides stability and control during the cut. I found the cutting speed comparable to the JORGENSEN, though the 12 TPI blade removes material slightly faster at the cost of a marginally rougher finish. For door casing work where the cut edge will be hidden under flooring, the slightly rougher finish is completely irrelevant. The reversible blade works well, though the locking pin may need a quick file to seat perfectly on some units.
The carbon steel construction holds an edge well for occasional use, though professionals report that the blade dulls faster than the JORGENSEN’s SK5 steel under heavy daily use. For a homeowner undercutting a dozen door casings for a single flooring project, this will never be an issue. The saw also handles PVC trim and plastics cleanly, which is useful for modern homes with synthetic trim materials.
At under 16 dollars, this is the least expensive saw in our entire lineup and it punches well above its weight. Multiple reviewers specifically noted that it saved them from buying a power tool for a one-time flooring project. One user undercut all the door jambs in a 1,500-square-foot house using just this saw and reported it still had plenty of life left afterward.
Budget-conscious DIYers who want a capable undercut saw for a single project will find this hard to beat. The cranked handle design is particularly helpful for door casing work, and the low price means you are not investing heavily in a tool you may only use once. It is also a great backup saw for professionals who want a manual option in their kit.
Professionals who will use the saw daily should consider the JORGENSEN instead for its harder blade steel and longer edge retention. The HAUTMEC is a great value buy, but the faster blade wear makes it less economical for high-volume use over time.
12 inch HSS Blade
14 TPI
1.3 lbs
Replaceable Blade
Made in USA
The Kraft Tool FC518 is the most substantial manual undercut saw in our lineup, and it feels like a serious tool the moment you pick it up. The 12-inch high speed steel blade is the longest in our manual saw group, giving you the deepest reach for thick or multi-layered door casings. At 14 TPI, the blade cuts aggressively through wood, and the sharpness out of the box is impressive. Multiple users specifically commented on how fast this saw cuts compared to other manual options.
The replaceable blade design is a significant advantage for professionals. When the blade eventually dulls, you swap in a new one instead of replacing the entire tool. This extends the effective life of the FC518 indefinitely and makes it a sustainable investment for contractors who undercut door jambs regularly. The fact that it is made in the USA also gives confidence in the build quality and materials.
I do need to flag the safety concern that several reviewers raised. The teeth extend all the way to the corners of the blade, which means there is no safe zone when handling the saw. If you are not careful, the corner teeth can catch your skin during cutting or handling. Several experienced users recommend filing the corner teeth down slightly to reduce this risk. It is also wise to place a cloth or scrap piece of flooring between the blade and any finished surfaces to prevent scratching.
At 1.3 pounds, this is the heaviest manual saw in our group, and the wider kerf can produce rougher cuts if you are not maintaining steady pressure. However, for speed and raw cutting ability, the FC518 is hard to beat in the manual category. One contractor reported undercutting 15 door jambs in under an hour with this saw, which is remarkably fast for a hand tool. The heavier weight actually helps with cutting momentum once you develop a rhythm.
Contractors and experienced DIYers who want a fast-cutting manual saw with a replaceable blade will appreciate the FC518. The 12-inch blade length is ideal for thick or double door casings, and the made-in-USA construction inspires confidence. If you undercut door jambs regularly but do not want to invest in a power saw, this is your best manual option.
Beginners should consider the JORGENSEN or HAUTMEC instead, as the exposed corner teeth on the FC518 pose a genuine injury risk for inexperienced users. If you need ultra-clean cuts on visible trim, the 14 TPI blade produces slightly rougher results than the finer-toothed options in our lineup.
Picking the right undercut saw comes down to three main factors: how often you will use it, what materials you are cutting through, and whether you prefer the speed of a power tool or the control of a manual one. Let me walk you through the key considerations that should drive your decision.
Corded electric undercut saws are the workhorses of the flooring industry. They deliver consistent power for as long as you need it, making them ideal for whole-house installations and professional use. The Crain 835 and EUS1800 both fall into this category, and they are what most professional installers reach for on a daily basis. The downside is weight, noise, and the need for an outlet or extension cord.
Cordless options like the ToolTech 20V offer genuine mobility advantages, especially in finished homes where running cords is inconvenient. However, battery life remains a significant limitation. Most cordless undercut saws last 15 to 30 minutes under load, which works for small rooms but not for full-day professional use.
Manual saws are the surprise value leaders in this category. Contractors on Reddit and contractor forums consistently report that manual flush-cut saws like the JORGENSEN and HAUTMEC handle 90 percent of residential door casing work for a fraction of the cost. They produce zero dust, make no noise, and require no setup time. For a single-room flooring project, a manual saw is often the most practical choice.
Blade selection matters more than most people realize. Carbide-tipped blades, like the 60-tooth blade on the Crain 575, produce the cleanest cuts but are more expensive to replace. High speed steel blades, like those on the Kraft Tool FC518 and Crain 835, cut fast and handle nails reasonably well. Diamond blades are essential if you need to cut through masonry, tile, or metal door frames.
Pay attention to tooth count as well. Higher TPI (teeth per inch) means smoother cuts but slower cutting speed. The JORGENSEN at 13 TPI and the HAUTMEC at 12 TPI strike a good balance between speed and finish quality for manual saws. For power saws, 36 to 40 teeth on a 6.5-inch blade is the sweet spot for door casing work.
Most standard door casings are 3/4 inch thick or less, so nearly every saw in our lineup handles this requirement. Where cut depth matters is against walls, where you need to cut deep enough to slide your flooring underneath. The EUS1800 leads with 1-1/4 inches of cutting depth against walls, followed by the Crain models at approximately 1 inch. Manual saws cut as deep as you can physically push them, which is typically limited by the blade length and your ability to keep the blade flat on the floor.
If you are undercutting 20 or more door casings in a single day, weight becomes a real factor. The corded power saws range from 10.9 pounds (Crain 575) to 19 pounds (Crain 835). The cordless ToolTech at 7.5 pounds and the manual saws at under 1 pound each are far easier on your arms and back during extended sessions. Consider your physical comfort alongside cutting power when making your final choice.
Cutting door casings inside a finished home creates a significant amount of fine dust. Power saws with vacuum ports, like the Crain 835 and EUS1800, connect to shop vacuums for dust extraction. This is a major quality-of-life feature if you are working in furnished homes. Manual saws produce minimal dust in comparison, which is another point in their favor for renovation work.
An undercut saw, also called a jamb saw, is the standard tool for undercutting installed wood door frames. These specialized saws feature offset blades that cut flush with the floor surface, allowing you to trim the bottom of door casings and jambs so flooring can slide underneath. Both powered options like the Crain No. 835 and manual flush-cut saws like the JORGENSEN dovetail saw work well for this task.
An undercut saw (jamb saw) is designed primarily for cutting door casings and trim at floor level, with a blade that extends below the tool body to cut flush with the floor. A toe kick saw is specifically designed for cutting subfloors under cabinets in the recessed toe kick area, with a blade that cuts completely flush to the cabinet face. While both make flush cuts, toe kick saws have a different blade orientation and are used primarily for subfloor work, whereas undercut saws are used for door jamb and trim cutting during flooring installation.
The best saws for cutting door trim include dedicated jamb saws like the Crain 835 for power cutting, manual flush-cut saws like the JORGENSEN or HAUTMEC dovetail saws for hand cutting, and oscillating multi-tools with wood blades for tight corners. For most residential door trim cutting during flooring installation, a manual flush-cut saw provides sufficient capability at a fraction of the cost of a power tool.
Yes, undercutting a door jamb is a standard practice in professional flooring installation. Using an undercut saw or jamb saw, you cut the bottom portion of the door jamb and casing at the exact height of your new flooring plus underlayment. This allows the flooring material to slide underneath the jamb for a seamless, professional-looking installation. Always use a piece of scrap flooring as a depth guide when setting your saw height.
Finding the right undercut saw for door casings does not have to be complicated. For professional installers who need maximum power every day, the Crain No. 835 is the clear choice with its 13 Amp motor and professional-grade build quality. For the best balance of power, accessories, and value, the igooo EUS1800 kit ships with everything you need in one box. And for homeowners or occasional users, a manual saw like the JORGENSEN or HAUTMEC handles standard door casing work at a fraction of the cost.
The best undercut saws for door casings in 2026 span a wide range of power, features, and price points, but they all share one common trait: they make clean, flush cuts that let your flooring installation look professional. Whether you choose a corded powerhouse, a cordless convenience tool, or a simple manual saw, the important thing is that you undercut those door casings before laying your floor. Your finished project will thank you for it.