Kitchen Sink and Hob Cutout Dimensions

The countertop is cut exactly once. Unlike a shutter that can be re-hung or a shelf that can be moved, a sink or hob cutout in quartz or granite is permanent — a wrong opening means a new stone slab. Yet in many kitchen drawings the sink and hob appear as rectangles with no dimensions, and the cutout is decided on site with a tape measure and a marker pen while the stone cutter waits. This article fixes the standard numbers in place: the two dominant sink sizes in Indian modular kitchens, the standard 4-burner hob opening, how both sit inside 600 mm cabinet modules, and the clearances around them that keep the kitchen working.

The context is the standard Indian modular kitchen: countertop height 900 mm, countertop depth 600 mm, base units in 600 mm modules — the metric data standard used across the industry. Ernst Neufert's Architects' Data records sink sizes as 600 × 1000 mm for a single sink with drainer and 700 × 1300 mm for twin sinks, while the Indian market has converged on two compact standards for the common 600 mm sink base: 600 × 450 mm and 780 × 430 mm. Both are designed to drop into the same 600 mm wide base cabinet, and the choice between them is a drainage and counter-space decision, not a cabinet decision.

What this article settles: which sink size for which kitchen, the exact hob opening and why the cutout is smaller than the hob, the module arithmetic that places both appliances on a standard run, and the plan clearances — from the sink to the hob to the fridge — that keep a working kitchen safe and fast. Figures from published references carry their source; market-standard figures are marked as commonly cited trade practice.

The standard sizes, in one table

The sink decision starts with the drainer question. A 600 × 450 mm single bowl is the compact standard: it fits a 600 mm base cabinet with roughly 75 mm of stone on each side of the cutout, which is enough margin for the stone to stay strong around the opening. The 780 × 430 mm variant with an integrated drainer trades bowl depth for a draining surface — the right choice in kitchens without a dishwasher, where washed vessels need a place to drip. Neufert's larger figures — 600 × 1000 mm single with drainer, 700 × 1300 mm twin — belong to bigger kitchens with 1000–1200 mm sink bases, and they remain the reference for luxury layouts where two people work the sink zone together.

The hob: overall size, cutout size, and the gap between them

A standard 4-burner built-in hob measures 600 × 520 mm overall, and it is designed — like the sink — to sit on a 600 mm base unit. The critical distinction is between the hob's overall size and the cutout: the glass or steel top overhangs the opening, so the stone cutout is always smaller than 600 × 520, typically by 20–40 mm on each side, and always to the manufacturer's template. Cutting a 600 × 520 hole for a 600 × 520 hob is the classic site error: the hob drops through. The template ships in the hob box; the stone cutter works from the template, never from the overall dimension.

Around the hob, the non-negotiable clearance is heat and splash. Keep at least 50 mm of stone between the hob cutout edge and the countertop front edge, a commonly cited minimum that keeps the stone lip from cracking under thermal cycling. Behind the hob, the splash zone rises 600 mm to the underside of the chimney or wall unit — wall units sit 300–350 mm deep and 400–700 mm high per the metric data standard, with the commonly cited 500–600 mm clearance above the counter bringing the chimney base to a safe height. And the sink-to-hob relationship matters for workflow: drafting manuals commonly cite 1.8 m as the maximum sensible distance between sink and prep, with the work triangle rule — legs of 1.2 to 2.7 m each, perimeter 4 to 7.9 m — keeping the three stations of sink, hob and fridge in one efficient loop.

The module arithmetic is the quiet hero of this drawing. With base units in 600 mm modules, the sink base and the hob base each occupy exactly one module, and the run in Fig. 2 uses five modules for 3000 mm: sink, 600 mm of prep counter, hob, and two flanking 600 mm storage modules. The 600 mm of prep between sink and hob is the minimum comfortable landing zone — chopped vegetables travel from board to kadhai without crossing the cook's body. Where the kitchen is longer, the extra modules go to prep and tall-unit storage, not to stretching the sink–hob distance: efficiency lives in keeping the triangle tight, not in spreading it across a wall.

Cutout detailing: the 10 mm that saves the stone

A cutout is not just a hole; it is a finished edge that will be seen and touched every day. The cut edge of quartz or granite must be polished, and the sink or hob must bed on silicone, not on bare stone — silicone absorbs the micro-movement of a heavy cast-iron kadhai landing on the hob and the thermal expansion of hot vessels in the sink. Undermount sinks need the cutout edge polished to a furniture finish because the edge is visible; topmount (drop-in) sinks hide the edge under their rim, which forgives a rougher cut but still needs the silicone bed. Either way, the cutout corners should be radiused, not sharp: a sharp internal corner in stone is where cracks start, a commonly cited stone-fabrication rule.

Final placement checks before the stone order goes out: confirm the sink base has no drawer or shelf in the trap zone — the bottle trap and waste pipe need the full cabinet depth, and a fixed shelf here guarantees a plumbing service nightmare. Confirm the hob base is not the sink base: water and gas share neither cabinet nor cutout. And confirm the chimney or hob hood width matches the hob — a 600 mm hob under a 600 mm chimney, centred on the same module line. These are one-line checks on the drawing; on site, each one is a day of rework and a spoiled slab.

Countertop costs in 2026

The cutout discussion is inseparable from the countertop material, because the material decides the fabrication cost and the edge behaviour. Basic 20 mm quartz at ₹250–425 per sq ft is the workhorse of Indian modular kitchens; granite at ₹100–350 per sq ft remains the budget king with the widest price spread by variety. A typical 40 sq ft kitchen platform in mid-range quartz runs about ₹14,000 in material — the reference figure that anchors most kitchen budgets.

Where standard sizes work — and when to go custom

• Straight and L kitchens on 600 mm modules: the 600 × 450 sink and 600 × 520 hob drop in with zero drawing friction — the standard case.
• Kitchens without a dishwasher: choose the 780 × 430 sink with drainer; the draining surface replaces the missing appliance.
• Two-cook households: step up to Neufert's 600 × 1000 single-with-drainer or twin 700 × 1300 on a 1000–1200 mm base, with the 1500 mm aisle the standards cite for two people passing.
• Island hobs: the same 600 × 520 hob applies, but the island needs 1200 mm clear aisles on the working sides and the chimney becomes an island hood.
• Avoid non-standard sink widths in rental or budget kitchens — replacement sinks and accessories are stocked for the two market standards.
• Avoid placing the hob cutout within 50 mm of the stone edge or the sink cutout; both are crack guarantees the fabricator will not warranty.