Circular Saws: What to Buy, How to Use One Safely, and Which Blade for the Job
The UK guide to circular saws. Corded vs cordless, blade sizes and tooth counts, worktop cutting technique, and what to buy from ~£40 to £390.
Your builder's cutting roof rafters and OSB sheets with his circular saw while you watch. Then it's two months later, the kitchen fitter needs the worktops trimmed to length, and he hasn't turned up. You can either wait (and delay the whole second-fix schedule), pay someone else, or make the cuts yourself. A circular saw handles both jobs. Buying the wrong one, or using it without understanding kickback, blade selection, and cutting technique, turns a straightforward task into a damaged worktop and a trip to A&E.
What it is and when you need one
A circular saw is a handheld power tool with a toothed disc that spins at high speed to make straight cuts. You push the saw along the material (or guide it with a rail), and the spinning blade cuts as it goes. The baseplate (the flat metal sole that sits on the workpiece) keeps the saw stable. An adjustable guard covers the blade when it's not in the cut.
It's the standard tool for cutting timber and sheet materials on a building site. Anything that needs a long, straight cut: rafters to length, plywood and OSB panels to size, decking boards, structural timber, kitchen worktops. If a mitre saw is for precise short crosscuts on individual boards, a circular saw is for everything else.
On a typical extension project, you'll need one in two phases. During roof construction, the carpenter uses it to cut structural timber, joists, and roof sheathing. Later, during kitchen installation, it's how worktops get trimmed to fit the room.
Types and variants
The two decisions that matter: corded vs cordless, and blade diameter.
Corded vs cordless
Corded saws plug into a 230V socket (standard UK domestic supply). They deliver consistent power regardless of how long you've been cutting, they're lighter because there's no battery pack, and they cost far less. A competent corded circular saw starts at ~£40. The only downside: you need an extension lead, and the cable can get in the way.
Cordless saws run on 18V lithium-ion battery packs. Modern brushless motors have closed the power gap for most tasks, and working without a cable is genuinely easier on a roof or in an awkward space. But you'll pay more. A mid-range cordless body (without batteries) costs £90 – £160, and that's before you add batteries at £40-80 each.
Corded for one-off projects
If you don't already own 18V batteries from another tool brand, buy corded. The community consensus across every forum thread on this question is the same: for a homeowner doing one extension over six to twelve months, corded makes financial sense. You get equal cutting performance for half the price.
The exception: if you already own DeWalt XR, Makita LXT, or Milwaukee M18 batteries from a combi drill or impact driver, buying a body-only cordless saw on the same platform is rational. You avoid the cable and use batteries you've already paid for.
On cordless saws, fitting a thin-kerf blade (2.2mm cut width instead of the standard 3mm) reduces the load on the motor and can extend battery life by up to 30%. Most users don't know this. It makes a noticeable difference on a 4Ah battery.
Blade diameter
Blade size determines cutting depth, which determines what thickness of material you can get through. In the UK, three sizes dominate the market:
| Blade diameter | Max depth at 90° | Best for | Weight/handling |
|---|---|---|---|
| 165mm | ~54mm | Studwork, decking, 2x4 timber, sheet materials. The DIY sweet spot. | Light and manageable. Huge blade variety. |
| 184-185mm | ~64mm | Thicker timber, versatile site use. Covers nearly everything. | Slightly heavier. Good compromise. |
| 190mm | ~66mm | Professional site standard. Handles all common framing timber. | Heavier. Trade-oriented. |
165mm is the right choice for most homeowners. It cuts through standard construction timber (47mm deep CLS/C16 studwork) with room to spare, handles all common sheet materials, and the saws are lighter and easier to control. The blade selection at this diameter is enormous.
184-190mm gives you extra depth for thicker timber and worktops. If you're doing heavy structural carpentry, the extra cutting capacity is worth the trade-off in weight. The Evolution R185CCS at 185mm is a popular budget choice in this range.
Avoid smaller blades (85mm, 115mm, 136mm, 150mm) for extension work. A 150mm cordless saw maxes out at around 45mm cutting depth. That's too shallow for 75mm (3x2) timber and leaves no margin on standard 47mm studwork.
Choosing the right blade
The saw is half the purchase. The blade you fit determines the quality of the cut. Stock blades on budget saws are often poor, and fitting a proper aftermarket TCT (tungsten carbide tipped) blade transforms the saw's performance.
Tooth count is what matters. Fewer teeth cut faster but rougher. More teeth cut slower but cleaner.
| Tooth count | Cut quality | Use case |
|---|---|---|
| 24T | Fast, rough | Rip-cutting structural timber along the grain. Speed matters, finish doesn't. |
| 40T | General purpose | Crosscutting timber and joists. Good for most site work on softwood. |
| 48-60T | Clean finish | Plywood, OSB, and sheet goods. Reduces splintering on the exit side. |
| 60-80T (TCG grind) | Very fine | Laminate worktops, melamine, MDF. Essential for chip-free worktop cuts. |
ATB (Alternate Top Bevel) teeth alternate in angle like tiny knives. They're the standard for crosscutting wood and sheet materials. Most general-purpose blades (24T to 48T) use ATB geometry.
TCG (Triple Chip Grind) alternates between a chamfered tooth and a flat raker tooth. It's slower but much more durable on abrasive materials. Use TCG for laminate worktops, MDF, and anything with hard surface layers that would quickly dull an ATB blade.
For an extension project, buy two blades: a 24T or 40T for general timber work, and a 60T+ TCG for worktop cutting. Total outlay for decent aftermarket blades: £15-30 for the pair. DeWalt Extreme thin-kerf blades and Saxton Pro blades both get strong recommendations from UK forums.
Never enlarge a blade's bore hole (the centre hole that fits over the spindle). If your saw takes a 20mm bore and the blade has a 30mm bore, use a bore reduction ring, a small metal adapter that sits inside the hole. These typically cost £2-3 as a standalone item, and many aftermarket blades include one in the pack. Running a blade with a sloppy bore fit causes wobble, poor cuts, and is a safety risk.
How to use it properly
Circular saws demand more respect than a combi drill or a jigsaw. The exposed blade spins at 3,900 to 5,200 rpm. Technique is the difference between clean, safe cuts and damaged material.
Setting up
Blade depth. Adjust the blade so it protrudes only 5-6mm below the underside of the material you're cutting. No more. Setting the blade too deep increases the contact area between teeth and material, generates more friction, and dramatically increases kickback risk. Most saws have a lever on the side that releases the baseplate to slide up and down, exposing more or less blade.
Bevel. The baseplate tilts to make angled cuts (most saws go to 45 degrees, some to 60). For straight cuts, lock the bevel at 0 degrees and check it's actually at zero, not a degree or two off. A baseplate that looks level but isn't will produce cuts that lean, and you won't notice until you try to join two pieces.
Support. This is where most beginners go wrong. Support the workpiece on the "keep" side (the piece you're keeping) and let the offcut fall free. Do not bridge both sides of the cut across two sawhorses. That sounds like it would stabilise the work, but it causes the cut to close and pinch the blade. A pinched blade means kickback, where the saw kicks back towards you at speed.
Making the cut
Mark your cut line with a pencil. For critical cuts, run masking tape along both sides of the line first. The tape holds wood fibres together and reduces splintering.
Line up the notch or guide mark on the front of the baseplate with your pencil line. Different saws put the guide mark in different places. Before cutting anything important, make a test cut on scrap and check the mark is accurate on your specific saw.
Use both hands. One on the main handle (trigger hand), one on the front auxiliary grip. Start the blade spinning before it contacts the material, then push the saw steadily forward. Let the blade do the cutting. Forcing the saw through faster than it wants to go creates rough cuts, overheats the blade, and increases kickback risk.
Stand to the side of the cut line, not directly behind it. If the saw kicks back, it travels straight back along the cut path. Standing offset means you're not in its trajectory. This is the single most important safety habit with a circular saw.
Cutting a worktop
Worktop cutting is the task most homeowners encounter during kitchen installation, and it's the one where technique matters most. A chipped laminate worktop is visible for years.
Face down. When using a circular saw, place the worktop with the decorative face pointing downward. The blade teeth rotate upward through the material and exit at the top, and that exit side is where splintering happens. With the face down, all the tearout occurs on the underside where nobody sees it.
Blade choice. Fit a 60-tooth or higher TCG blade. A general-purpose 24T blade will rip through the laminate and chip it badly.
Masking tape. Apply tape along both sides of the cut line on the decorative face. This holds the surface fibres and further reduces chipping.
Guide. Always use a guide rail or clamp a straight timber batten to the worktop as a fence. Never freehand a worktop cut. Commercial guide rails cost £20 – £80, but a straight piece of plywood with a batten screwed to it works just as well. Multiple forum users and professional joiners confirm DIY plywood guide rails produce results comparable to expensive branded tracks.
Speed. Feed slowly. Rushing through laminate causes burning and splintering. If you smell burning, you're pushing too fast or the blade is dull.
For compact laminate worktops (the very dense, thin type), don't try to cut through in one pass. Start with a 2mm scoring cut along the line, then increase in 3mm increments. This prevents the surface layer from cracking ahead of the blade.
How to check it's working properly
Before every use, three things.
Blade guard. Pull the lower guard back by hand and release it. It should snap back and fully cover the blade under its own spring tension. A sticky guard that hangs open is a serious hazard. Clean sawdust out of the guard mechanism. If the spring is weak, replace the guard assembly before using the saw.
Blade condition. Look at the teeth. Chipped or missing carbide tips mean the blade needs replacing. A dull blade (teeth still intact but not sharp) cuts slowly, requires more pressure, and increases kickback risk. If the blade needs more push than usual, swap it out.
Baseplate check. Set the bevel to 0 degrees. Place a combination square against the blade (with the saw unplugged) and check the blade is perpendicular to the baseplate. If it's off, the bevel adjustment has drifted or wasn't accurate from the factory. Budget saws are more prone to this. Adjust until the blade reads true at 90 degrees.
What to buy
Three tiers. Prices from UK retailers as of April 2026.
Budget: ~£40 to £80 (corded)
Titan TTB874CSW 165mm 1200W at Screwfix (around £34). The cheapest saw that's worth using. It cuts, it has a depth stop and bevel adjustment, and it's disposable if it breaks. The stock blade is poor. Budget another £10 for an aftermarket 40T TCT blade.
Wickes 190mm 1400W (£48). Bigger blade, deeper cut, still cheap. Adequate for a homeowner who needs to make 50 cuts over a project and doesn't need finesse.
Evolution R185CCS 185mm 1600W (around £79-80 depending on retailer). This is the budget standout. 1,600W motor, 64mm cutting depth, bevel to 60 degrees, electric blade brake (stops the blade in 0.4 seconds after trigger release), vacuum extraction port. The baseplate finish is rough (it doesn't glide as smoothly as a Makita or DeWalt), but for the price, it's hard to beat. Comes with Evolution's multi-material TCT blade, which is better than most stock blades. UK Tool Guide's top budget pick for 2026.
Mid-range: £90 – £160
This tier splits between premium corded saws and budget cordless bodies.
DeWalt DWE560 184mm 1350W corded (£120 at Toolstation). Solid build, smooth baseplate, reliable depth and bevel adjustment. A proper trade-quality corded saw at a reasonable price.
Makita HS7601J/2 190mm 1200W corded (£130-140). 5,200 rpm, 66mm cutting depth, 3.8kg. Comes in a MakPac carry case. The Expert Reviews "Best Corded" pick. This is the corded saw you buy if you want something that feels precise and will last twenty years.
DeWalt DCS391N-XJ 165mm 18V cordless (body only: £100-140 depending on retailer). The classic cordless option. Lightweight, punches above its weight for battery power. Needs a DeWalt XR 18V battery (sold separately).
Makita DSS611Z 165mm 18V cordless (body only: £120-140). Makita's LXT equivalent. Smooth operation, good ergonomics. 22-minute charge time on a fast charger.
Professional: £190 – £390
DeWalt DCS570N-XJ 184mm 18V brushless cordless (body only: £190). Brushless motor, deeper 64mm cut, premium build. The pro pick for a cordless site saw.
Makita DHS680Z 165mm 18V brushless cordless (body only: £199). 5,000 rpm, brushless, auto-speed-change technology that adjusts motor output to the load. Highly rated.
Milwaukee M18 CCS66-0 FUEL 190mm 18V brushless cordless (body only: £200). Milwaukee's brushless platform. 190mm blade, serious cutting depth. Heavy, but cuts like a corded saw.
All body-only prices above exclude batteries and charger. A starter kit (saw + 2 batteries + charger) typically runs £250-400.
| Model | Power | Blade | Max depth | Price (April 2026) | Best for |
|---|---|---|---|---|---|
| Titan TTB874CSW | 1200W corded | 165mm | ~54mm | £34 | Cheapest usable option |
| Evolution R185CCS | 1600W corded | 185mm | 64mm | ~£79-80 | Best budget. Electric brake. |
| DeWalt DWE560 | 1350W corded | 184mm | ~64mm | £120 | Trade-quality corded |
| Makita HS7601J/2 | 1200W corded | 190mm | 66mm | £130-140 | Premium corded. 20-year tool. |
| DeWalt DCS391N-XJ | 18V cordless | 165mm | ~54mm | £100-140 body | Solid cordless entry |
| Makita DHS680Z | 18V cordless | 165mm | 57mm | £199 body | Top cordless mid-range |
| DeWalt DCS570N-XJ | 18V brushless | 184mm | 64mm | £190 body | Pro cordless, deep cut |
Hire vs buy
Circular saw hire runs £6 – £17 per day from tool hire companies (weekly rates around £30-35 for a 190mm saw). A budget corded saw costs from ~£40. Two to three hire days costs more than buying a saw you keep.
Hire makes sense only if you need the saw for a single afternoon, like one worktop cut. If your build involves any timber or sheet work across multiple weeks, buying is the rational choice.
Alternatives
A mitre saw is safer and more accurate for crosscutting individual boards, studs, and joists. If you're mostly cutting framing timber to length, a mitre saw is the better first purchase. A circular saw excels at sheet material (plywood, OSB, MDF) where a mitre saw can't reach, and at long rip cuts. The two tools complement each other rather than compete.
A jigsaw handles curved cuts and sink/hob cutouts in worktops, but it's slower and less accurate for long straight cuts. If you need to cut a worktop to length, a circular saw does it in one pass; a jigsaw would wander.
A reciprocating saw is for demolition, not precision. It can rough-cut timber for removal, but it's useless for anything that needs a straight edge.
A plunge saw (also called a track saw) is the professional upgrade from a circular saw for sheet materials and worktops. The blade is fully enclosed inside a guide rail, giving cleaner cuts, better dust extraction, and safer operation. But a plunge saw with a guide rail costs two to four times more than a circular saw. For a homeowner doing one extension, a circular saw with a clamped straight edge achieves the same result at a fraction of the cost.
Where you'll need this
- Roof structure - cutting structural timber rafters, joists, and plywood/OSB roof sheathing to size
- Kitchen installation - cutting worktops to length and trimming end panels, plinths, and filler pieces
These are the two main tasks where a circular saw earns its place on any extension or renovation project. If your builder handles all the timber cutting, you may only pick one up for the worktop trim, but that one cut is enough to justify having the right tool and knowing how to use it.
Safety
Circular saws are the most dangerous common power tool on a domestic building site. The exposed blade, high speed, and kickback potential demand proper precautions.
Do not wear gloves when operating a circular saw. This is counterintuitive, but it's established safety practice. Gloves reduce your tactile feedback on the trigger and handles, and loose glove material can catch on the spinning blade and pull your hand into it. Bare hands give you better grip and better control.
Hearing protection is mandatory. Circular saws produce 95-110 dB. At 95 dB, permanent hearing damage starts within seven minutes of unprotected exposure. Wear ear defenders or moulded ear plugs for every cut.
Safety glasses. Wood chips and sawdust fly unpredictably. A splinter in your eye stops the whole day.
Dust mask. FFP2 minimum. Hardwood dust is a known carcinogen (it causes nasal cancer), and softwood dust causes occupational asthma. Even for softwood, prolonged exposure without a mask is a health risk. If you're making more than a few cuts, wear the mask.
No loose clothing or jewellery. Anything dangling near the blade can catch. Roll up sleeves. Remove lanyards, watches, bracelets.
Wait for the blade to stop. After finishing a cut, keep the saw in position until the blade stops completely. Don't lift it while the blade is still spinning or set it down blade-up. Lay it on its side with the blade pointing away from you.
Electric brake. If you're choosing between two similarly priced saws and one has an electric brake, buy that one. Without it, the blade freewheels for several seconds after you release the trigger, and that coasting blade is still sharp enough to cause serious injury.