Core Cutting · Karachi
Core Cutting Services in Karachi
Core cutting is how a professional opening is made in concrete. A hollow diamond bit grinds a circle out of the wall, slab or beam and the concrete inside it is lifted out as a core — instead of the concrete being broken away. The result is a straight, round opening of the exact diameter your services require, with the concrete around it left sound. If you are searching for a dependable core cutting contractor in Karachi, this page explains what we cut, how we work and what changes the price.
Service specifications
Typical diameters
25 mm to 500 mm
Surfaces cut
Walls, floor slabs, beams, columns (with approval)
Method
Diamond core drilling, water-cooled
Materials
Reinforced concrete, plain concrete, block and masonry
Coverage
Karachi — availability confirmed per project
What concrete core cutting is
Concrete core cutting uses a tubular bit with diamond segments bonded to its cutting edge. The bit rotates against the concrete and grinds through it, while water is fed through the centre to cool the segment and to keep dust out of the air. A pilot bit or an anchor fixes the machine to the surface so the cut starts in exactly the position you marked.
Because the bit cuts a circle rather than breaking the concrete, the surrounding material stays intact. The concrete cylinder left inside the hole is freed at the end of the cut and removed. When the hole has to pass through a steel bar, diamond tooling will cut through it — but reinforcement is never cut as a shortcut. If a structural bar is in the way, we raise it with you and the project engineer before work continues.
Holes can be cut dry in some situations, but water-cooled cutting is the reliable method for reinforced concrete: it controls the dust, protects the diamond segments from overheating and keeps the finish of the hole consistent through the full depth. For concrete core cutting in Karachi, that combination of water control and correct tooling is what keeps the site usable while the work is going on.
Where core cutting is used on Karachi projects
Most core cutting work is tied to a service that has to pass through concrete. Typical enquiries we receive include:
- Plumbing, drainage and waste-pipe openings through floor slabs, shafts and walls
- Electrical routes — conduit, cable and busbar penetrations through slabs and risers
- HVAC, exhaust and fresh-air openings, including chilled-water pipe routes
- Water tank, pump room, firefighting and sump connections through concrete walls
- Anchor, bolt and equipment base holes in concrete floors, plinths and foundations
- Service shafts, lift and staircase related openings where the work is covered by an approved drawing
- Concrete test cores and sample extraction for consultants and testing laboratories
- Ventilation and duct openings for plant rooms, basements and utility areas
Project types we are called out for
Core cutting fits projects of very different sizes, and the planning changes with each one. On new construction, openings are usually set out from the services drawing before the finishes go on. On fit-outs and interior works, the holes are often needed where a drawing is not available, so the position is agreed on site.
On live sites — banks, clinics, warehouses, factories, offices and apartment buildings — the work is planned around the people already using the building: cutting times are agreed in advance, the work area is protected and the slurry is managed so the cutting can be done without shutting the floor down for days.
We regularly work directly for contractors, for builders and developers, for renovation and interior companies, and for property owners and facility managers who need one or two holes cut properly. If you need a core cutting contractor in Karachi for concrete openings, the estimate tool on this site is the quickest way to get a starting figure before you call.
How the service works
We keep the process simple and predictable so you can plan the trades behind us:
You send the requirement — hole diameter, number of holes, slab or wall thickness, and the project location in Karachi.
We review the position on site or from your drawing, confirm access, power and water, and check for embedded services and reinforcement.
You receive a written scope and quotation covering diameters, quantity, method and timing.
We set out and mark each hole, confirm the markings with you, then cut with the machine anchored in position.
Cores are removed, the holes are cleared of slurry and debris, and the area is handed back ready for the next trade.
Factors affecting the cost
There is no single rate for core cutting, because two holes of the same size can take very different amounts of work. The figure we quote depends on:
- Hole diameter — larger bits cut more concrete, take longer and cost more to run
- Depth or thickness — a 300 mm raft does not behave like a 125 mm slab
- Reinforcement — heavily reinforced concrete slows the cut and wears tooling faster
- Number of holes — a larger quantity brings the rate per hole down
- Access and working height — restricted spaces, upper floors and scaffolding add time
- Number of visits and travel distance within Karachi
- Availability of power and water at the cutting position
- Site timing — working outside normal hours or in an occupied area needs extra planning
Working around reinforcement and services
Two things decide whether a core cut is straightforward or becomes a problem: the reinforcement inside the concrete and the services already buried in it. Before cutting, we agree the hole positions against whatever information is available — a structural drawing, an as-built drawing or a site discussion — so conduit, water lines, drainage and post-tensioning are considered before the bit goes in.
Where a wall or slab is load-bearing, we do not decide on the opening ourselves. The structural consultant or the engineer responsible for the building approves the position and the diameter of the opening, and we carry out the cut to that approved specification. That is not red tape — a core through the wrong part of a shear wall or a beam cannot be undone.
Core Cutting FAQs
Core Cutting — common questions
If your question is not answered here, call us — the answer usually takes less than a minute.
What is the difference between core cutting and ordinary breaking?
Breaking removes concrete with impact, leaving a rough, unpredictable edge and often damaging the concrete around the opening. Core cutting grinds a precise circle with a diamond bit, so the hole comes out round and to size, and the concrete surrounding it stays sound.
Can you cut through reinforced concrete?
Yes. Diamond core bits cut through steel reinforcement when a hole has to pass a bar. We only do this where the hole position has been agreed, and we raise any conflict with reinforcement before cutting rather than cutting around it on our own decision.
What is the largest hole you can cut?
Diameter depends on the machine, the wall or slab thickness and the access to the position. Practically we handle large openings by cutting a ring of overlapping cores, which is standard practice for big penetrations. Send us the diameter and we will confirm the method.
Do you need power and water at the site?
Water-cooled diamond cutting needs a water supply at the machine and a single-phase power point. If neither is available, tell us in advance and we will plan an alternative arrangement — a generator and a water tank can be brought in, which affects the quotation.
Can you cut the opening in a load-bearing wall?
Only where the opening has been approved by the engineer responsible for the structure. We carry out the cut to that approved position and diameter. We do not decide structural openings ourselves, because the reinforcement layout and load path have to be checked first.
Will core cutting make a mess on a finished floor?
Cutting always produces water and concrete slurry, so we work with a controlled water feed, sheet the surrounding area and clean the holes and the work zone at the end. On finished floors we agree the protection and cleaning requirement before we start.
Related services
Other work we carry out
Most projects need more than one type of opening. These are the services that usually go with this one.
Vertical holes through floor slabs for drainage, plumbing, conduits and services — cut accurately and cleaned out ready for the pipe.
Horizontal and angled openings through concrete, block and masonry walls for pipes, cables and ventilation — cut with the correct tooling.
Holes for fixings, anchors, pipes, conduits and ventilation — drilled to the right diameter and depth in concrete, block and masonry.
Request a quotation
Need core cutting priced for your site?
Send the diameter, the quantity, the thickness and the project area in Karachi, Sindh. You will get a written scope and a firm quotation.