What Is Diamond Drilling? Types, Uses, and How to Choose the Right Method

Most people think diamond drilling is only for big commercial jobs. In practice, many of the jobs we see every week are one hole in a home: for an extractor fan, cooker hood, soil pipe or boiler flue. Across more than 120 jobs in Bristol and the South West, we’ve worked through brick, block, Bath and Pennant stone, concrete and reinforced concrete, from domestic holes to commercial service penetrations. Diamond drilling is a way of cutting holes, grooves and openings in masonry or concrete using industrial diamond segments that grind through the material rather than hammering it.

What Is Diamond Drilling?

Diamond drilling is a controlled cutting method. A diamond core bit has metal segments containing industrial diamonds at its rim; as the bit rotates, the segments grind away the material and leave a round core. The tool does not rely on hammer action, which helps limit vibration and the risk of cracking or breaking out the back of a wall.

A core drill can be handheld for suitable smaller holes or fixed to a rig for greater control, larger diameters and deeper cuts. Diamond tools also include saw blades and wall chasers, so the term can cover more than round holes.

The Three Types of Diamond Drilling and Cutting

Diamond Core Drilling

A diamond core drill cuts a circular hole, commonly from around 25 mm to 300 mm in diameter, with larger diameters possible using suitable equipment. The right diameter and depth depend on the pipe or duct, wall construction and access; a cavity wall, for example, may need the inner and outer leaves considered separately.

Handheld drilling is useful for accessible holes where the material and diameter suit the tool. A rig-mounted drill is secured to the surface and is generally used for larger or deeper holes, repeated drilling, or work in concrete and reinforced concrete. Before drilling, the operator should check for services and establish whether the wall or slab has structural restrictions.

Concrete Saw Cutting

Wall saws make controlled cuts in vertical concrete or masonry, including openings for doors and windows. Floor saws cut horizontal surfaces such as concrete slabs, while ring saws can make deeper cuts than many standard handheld saws and can be useful where access limits the size of the blade.

Saw cutting can form an opening or divide a slab into sections, but it does not remove the need for structural checks. Openings in load-bearing walls or slabs need the appropriate design and support plan before cutting begins.

Wall and Floor Chasing

A wall chaser uses paired diamond blades to cut two parallel lines, then the material between them is removed to create a groove for cables or pipes. Chasing can be done in suitable brick, block and some concrete, but the permitted depth and route depend on the wall type and its structural role.

Dust-extracted chasing uses an H-class extractor to capture fine dust at the tool. Before making a chase, check for hidden electrical cables, pipes and restrictions on chasing in structural walls; routes should not be cut by guesswork.

Wet vs Dry Diamond Drilling

Wet diamond drilling feeds water to the cutting point to cool the bit and control dust, producing slurry that must be collected and managed. Dry drilling is possible with suitable equipment and effective extraction, but it should not mean allowing dust to escape into the room.

The choice depends on the material, bit, location and ability to manage water or dust. LAP uses wet core drilling with water collection and slurry control; for dry cutting, use suitable extraction and follow HSE guidance on construction dust. Read more about wet and dry diamond drilling before choosing a method.

What Diamond Drilling Is Used For

In our work, diamond core drilling, wall sawing, floor sawing, ring sawing and chasing have covered jobs from a single extractor hole to commercial M&E penetrations, including sites such as Bristol Airport and a Skanska project. Typical materials include brick, blockwork, Bath stone, Pennant stone, concrete and reinforced concrete; the tool and method need to match the material and access.

Common domestic core holes include 100–150 mm for extractor fans, 125–160 mm for cooker hood ducts, about 127 mm for a 110 mm soil pipe, and roughly 100–150 mm for boiler flues. Smaller service penetrations are often around 25–100 mm. These are starting points, not fixed specifications: measure the actual duct or pipe and allow for its required clearance.

For larger jobs, saw cutting can form door or service openings, while floor cutting can create routes for drainage or remove a defined section of slab. Chasing is used for narrower cable and pipe routes. Confirm the opening size, depth and structural requirements before work starts.

Diamond Drilling vs Other Methods

We use diamond tools every day and compare them with SDS rotary hammers fitted with TCT core bits, breakers, angle grinders and disc cutters. The differences show up in the finish, vibration, dust, noise, ability to cut steel or stone, and how much repair work remains afterwards.

For many small holes in ordinary brick or block, an SDS drill is quicker and less costly to set up. A diamond core drill is often preferable for larger diameters, finished rooms, hard stone or concrete, and locations where a clean edge and low vibration matter. See diamond drilling compared with SDS drilling.

When You Don't Need Diamond Drilling

Diamond drilling is not automatically the right choice. For a hole up to around 50 mm through ordinary brick or block, an SDS drill may be quicker and cheaper, provided the finish and vibration are acceptable and you have checked for hidden services.

Diamond equipment also needs setup. Wet work requires water and slurry control; dry work needs effective extraction, and very heavily reinforced concrete can slow drilling. For one small hole, the cost of a professional visit may exceed the cost of doing the work yourself with suitable equipment, but that does not remove the need for safe dust control or checks before drilling.

Do You Need Diamond Drilling?

Use this quick guide to decide what to investigate next:

• Choose diamond drilling or sawing for concrete, reinforced concrete or hard stone; holes over about 100 mm; clean cuts in finished rooms; and openings in structural walls or slabs after the required checks.
• Consider it where vibration, cracking or dust could cause problems, such as near brittle finishes, occupied rooms or sensitive equipment.
• An SDS drill may be enough for a small hole—around 50 mm or less—in ordinary brick or block, if the location and finish allow for impact drilling.
• Pause before making an opening or chase if you do not know what is inside the wall or slab, or whether it is structural. Check drawings and services, and get the appropriate structural advice.

LAP Diamond Drilling offers free quotes from photos and can advise whether the job needs diamond equipment or a simpler method. The team is a Drilling and Sawing Association member, holds CSCS, IPAF and PASMA credentials, and has a 5.0 rating from 19 Google reviews.

How Much Does Diamond Drilling Cost?

LAP’s guide lists a £150 minimum visit, with additional holes typically costing £25–£150 each. A half-day is around £250–£300 and a full day around £450–£550, all excluding VAT; access, material, hole size, depth, setup and water or dust management affect the quote.

For a more detailed breakdown, see the diamond drilling cost guide. For a sense of how the work affects a visit, read how long it takes to drill a hole.

Diamond Drilling FAQs

Is diamond drilling the same as core drilling?

Not exactly. Diamond core drilling is one type of diamond drilling and makes round holes; diamond saws cut openings and slabs, while wall chasers make grooves for cables and pipes.

How does a diamond core drill work?

A motor rotates a core bit whose rim has diamond segments. Those segments grind away the material to form a circular cut, rather than using an SDS-style hammer action.

Can diamond drilling cut through steel?

A suitable diamond core bit can cut through reinforcing steel, or rebar, within concrete, but the steel can slow the work and affect the bit. The operator should check the reinforcement and any structural requirements before cutting; do not drill through rebar based on guesswork.

Is diamond drilling messy?

Wet drilling produces slurry, which needs to be contained and collected; it is not dust-free. Dry drilling can release respirable crystalline silica unless suitable extraction is used, so dust control and protection matter in either case.

How big a hole can you diamond drill?

Common domestic holes range from about 25 mm to 300 mm, with larger diameters possible using suitable equipment. The practical limit depends on the drill, material, depth, access and whether the hole crosses reinforcement or multiple wall leaves.

Does diamond drilling crack walls?

It creates much less impact and vibration than a breaker or hammer drilling, which reduces the chance of damage around a clean core hole. It cannot guarantee that no damage will occur: poor positioning, unsuitable setup, hidden defects or an unplanned structural cut can still cause problems.

Can I diamond drill myself?

You can hire equipment, but you need the right bit, stable setup, dust or slurry controls, and a reliable check for hidden services. Structural openings, reinforced concrete and work at height may need specialist equipment, competent operators or professional design checks.

How long does it take to drill a hole?

A straightforward hole may take only a short time to cut, but setting up, fixing the rig, checking the location and controlling water or slurry can take longer than the drilling itself. Material, diameter, depth and access all affect the visit; typical drilling times and visit lengths explains the factors in more detail.

Use diamond drilling or sawing for hard materials, larger holes, clean finishes and planned structural openings; use an SDS for suitable small holes in ordinary brick or block. Send a photo to LAP Diamond Drilling for a free quote and an honest answer on whether you need diamond drilling.