18V vs 12V Cordless Drills: What You Actually Need

What does 18V actually mean?

The voltage on the box is the rating of the battery pack, not the power the drill constantly delivers. An 18V pack runs at 18 volts when fully charged and sags as it drains, so the real figure you care about is how much torque the motor can produce. Higher voltage gives the motor more headroom, which means more torque and less stalling on hard materials.

UK brands mostly sell 12V and 18V cordless tools, with 18V being the standard for anything serious. You will also see 20V MAX on some US-imported tools, but that is an 18V battery with marketing applied. Same cells, same voltage, flashier sticker. Ignore it and compare on torque, weight and battery ecosystem instead.

12V vs 18V: the real difference

Here is the honest breakdown of what each voltage actually buys you:

• 12V drills weigh around 1kg, fit in a drawer, and will happily screw together flat-pack furniture, fit curtain rails into timber, and drive the odd screw into plasterboard. They stall on brick, struggle with long screws in hardwood, and their batteries drain fast under load.
• 18V drills weigh 1.5-2kg and cost a bit more, but they drill into brick, breeze block, metal and thick timber without complaining. They also run bigger accessories like hole saws, and their batteries power an entire ecosystem of other tools.

For most people reading a UK maker site, the answer is 18V. The only exception is if you live in a flat, own zero tools, and your entire DIY list is IKEA furniture and picture hooks. Then a 12V drill is genuinely the lighter, cheaper, easier answer.

Brushed vs brushless motors: what's the difference?

A brushed motor uses carbon brushes to transfer power to the spinning armature. They work fine, but the brushes wear out over time and they waste energy as heat. A brushless motor swaps those physical brushes for an electronic controller, which means less friction, less heat, and more of the battery's energy turned into actual turning force.

In practical terms, brushless drills deliver roughly 30-50% more runtime per charge and noticeably more torque at the same voltage. They also last longer because there is nothing mechanical to wear down. The catch is price: brushless tools cost more, which is why budget kits are still brushed.

My rule: if the drill is going to earn its keep more than a few times a year, pay the extra for brushless. The Ryobi RPD18BL2-0 is the cheapest brushless 18V combi drill in the UK right now, and it has the widest tool ecosystem behind it. If you only build flat-pack twice a year, the brushed Black & Decker BCD700S1K-GB with its included bit set is a perfectly sensible budget buy.

Hammer drill vs combi drill vs impact driver

This is where shops lose people, so let's keep it simple:

• Combi drill - drills holes and drives screws, with a keyless chuck that accepts any round-shank bit. This is the do-everything first drill.
• Hammer drill - a combi drill with an extra hammer action that pounds the bit back and forth as it spins, chewing through brick and block. Needed for wall plugs, TV brackets, and anything going into masonry.
• Impact driver - uses a hexagonal collet instead of a chuck, and delivers rapid rotational hammering. It drives long screws into dense timber like nothing else, but it cannot drill holes. You buy one later, after the combi.

Most 18V combi drills sold in the UK, including the Bosch Professional GSB 18V-55 and the Milwaukee M18, include the hammer function anyway. So for your first drill, buy an 18V combi drill with hammer built in. You cover every job you will face in the first couple of years.

What to look for before you buy

Once you have settled on 18V brushless with hammer, three things separate a good buy from a regret:

• Battery platform. This is the biggest decision you will make. DeWalt XR, Makita LXT, Bosch Professional, Milwaukee M18 and Ryobi ONE+ all have huge ecosystems, but you are locked in once you own two batteries. Ryobi ONE+ is the widest and cheapest to grow; DeWalt and Makita are the trades' favourites.
• Chuck quality matters here - a 13mm metal keyless chuck is the standard, and cheap plastic chucks slip under load and eat drill bits.
• Kit versus bare tool is the final decision. A kit with two batteries and a charger costs more upfront but saves you money versus buying a bare tool and batteries separately. The DeWalt DCD778S2T kit is the best value complete package on the UK market right now.

Products mentioned in this guide

• DeWalt DCD778S2T 18V XR Brushless Hammer Drill - best complete kit, two batteries plus charger in TSTAK
• Makita DHP486Z 18V LXT Brushless Combi Drill - best body-only buy for existing Makita owners
• Bosch Professional GSB 18V-55 Combi Drill - 55Nm of torque, pro build quality
• Milwaukee M18 Hammer Drill - the bare-tool pick for serious makers
• Ryobi RPD18BL2-0 ONE+ Brushless Combi Drill - best value brushless, 95Nm torque
• Black & Decker BCD700S1K-GB 18V Hammer Drill - best budget kit with 50-piece bit set included

Also read: Best Cordless Drills UK 2026 and Mitre Saw vs Circular Saw

Frequently Asked Questions

Final Verdict

For the vast majority of UK makers and DIYers, the answer is the same: an 18V brushless combi drill with a hammer function. It covers drilling into timber, brick, metal and plasterboard, drives every screw you will own, and plugs into a battery ecosystem you can build on for years.

The DeWalt DCD778S2T is the best all-round first buy because the kit comes complete with two batteries and a charger. If budget is the priority, the Ryobi RPD18BL2-0 gets you brushless power and the widest ecosystem at the lowest price. And if you only build flat-pack twice a year, the Black & Decker BCD700S1K-GB will do you proud for under fifty quid. Skip the 12V aisle unless your entire DIY life is IKEA.