Cordless Drill vs Impact Driver: Which Do You Actually Need?

A cordless drill accepts both round-shank and hex-shank bits. That means standard drill bits for wood, metal, masonry, and tiles — plus all screwdriving bits. One tool handles the full range of home DIY. The adjustable clutch protects delicate fixings, chipboard that strips easily, and hinge screws that need precision.

An impact driver accepts hex-shank bits only. Standard drill bits will not fit. It drives screws excellently but cannot drill holes. Buying an impact driver without a drill means you will need a second tool the first time you need to hang a shelf or fit a lock.

When resistance builds up — a long screw halfway into hardwood — the impact driver's internal hammer mechanism fires rapid concussive rotational impacts, typically 2,000–3,000 per minute. It sinks a 100mm screw into hardwood without cam-out or stripped heads. A drill requires a steady hand and careful control to avoid the same result.

For high-volume screwdriving — decking boards, timber frames, garden structures — an impact driver gets through the work in roughly half the time with far less physical effort. It also drives more screws per battery charge because the impact mechanism is more efficient than continuous rotational torque.

Impact drivers are almost always lighter and more compact than equivalent drills. No clutch collar, no keyless chuck — the mechanism is simpler. For overhead work, driving screws into joists, or working in confined spaces, the smaller head and lighter body make a noticeable difference over a full day.

Cordless drills are bulkier by design. The chuck and clutch mechanism add both length and weight. For occasional use this is irrelevant. For a full day of screwdriving on a building project, the weight difference accumulates — particularly if you are working above shoulder height.

If you own no power tools, buy the drill. It handles every screwdriving task an impact driver can (just slightly slower on very long screws) and also drills holes — which you will need to do. A drill without an impact driver covers about 90% of home DIY. An impact driver without a drill covers about 60%.

If you already own a drill and do significant screwdriving work — timber projects, decking, assembling garden structures — buy the impact driver next. It will immediately change how quickly you work. If you can stretch to a twin-pack on the same battery platform, most manufacturers sell drill-plus-impact-driver bundles for significantly less than two separate purchases.