Basic Guide to Replacing Your Old Built-In Cooker Hob

Are you planning to replace your old built-in cooker hob with a new one? The good news is that replacing a hob is usually straightforward, as long as your new hob fits the existing cut-out in your countertop. This guide walks you through choosing the right hob, measuring the cut-out accurately, and replacing it safely.

If you are still deciding which type of hob to buy, read our full guide first: How to Choose a Cooker Hob in Singapore.

Step 1: Choose the type of cooker hob

The first step is deciding on the type of hob you want. Ask yourself:

• Material: do you prefer a stainless steel gas hob, a tempered glass gas hob, or a built-in induction hob?
• Burners: how many burners do you need? Would a 2-burner hob be sufficient, or do you need a 3-burner hob for more cooking space?

For the full comparison of gas, induction and vitro-ceramic, and the difference between stainless steel and tempered glass, see our cooker hob buying guide and our gas hob vs induction hob guide. Once you have decided, the next step is to make sure your new hob will fit the existing space in your kitchen.

Step 2: Measure the existing cut-out hole

The cut-out is the hole in your countertop that the hob drops into. It is smaller than the hob's overall glass or steel top, because the outer rim of the hob rests on the counter and overlaps the edges of the hole.

To confirm your new hob will fit, measure the existing cut-out accurately:

1. Remove the old hob: if you have not already, carefully remove the old cooker hob to expose the cut-out hole. For a gas hob, see Step 3 first, the gas must be disconnected by a certified gas service worker before removal.
2. Measure the cut-out: use a measuring tape to record the length and width (front to back) of the hole, and the corner radius (how rounded the corners are). If you are unsure, measure from underneath, or remove the old hob completely for a more accurate reading.

Imagine the following is your existing built-in cooker hob:

The image below shows the old built-in cooker hob removed entirely, leaving the old cut-out hole. Measure the length, the width (front to back) and the corner radius:

Step 3: Disconnect the old hob safely

Before removing the old hob, disconnect it properly:

• Gas hob: the gas supply must be disconnected by a certified gas service worker. Do not attempt to disconnect or reconnect a gas hob yourself.
• Induction or electric hob: switch off the power at the isolator or power point before the hob is removed, and have any wiring work done by a qualified electrician.

Step 4: Check the new hob's cut-out dimensions

Once you have measured the existing cut-out, compare it with the dimensions of your new built-in cooker hob. Most manufacturers provide specific cut-out requirements, which look something like this:

Does the new hob fit?

• If the existing cut-out dimensions match the required measurements for your new hob, you are good to go.
• If the existing cut-out hole is larger than required, consider a hob whose outer rim is wide enough to cover the opening, or choose a different model with a suitable size.
• If the cut-out hole is slightly smaller, your installer can enlarge it to fit, but be aware this may incur extra cutting and resizing costs.

A note on hob size for HDB and BTO kitchens

Cooker hobs come in different widths. As a practical guide, hob width should not exceed 86cm, and BTO kitchens typically use hobs around 56 to 76cm wide. When replacing, remember that it is the manufacturer's specified cut-out size that must match your countertop opening, not just the hob's overall width.

Step 5: Check the gas point or power supply

Also check that the connection for your new hob is in the right place:

• For a gas hob, confirm the gas point position and that a certified gas service worker can connect the new hob.
• For an induction hob, check the power point. Some higher-powered induction hobs need a dedicated, higher-rated electrical supply.

Step 6: Final considerations

Once you have confirmed the new hob will fit and the supply is suitable, you are ready to purchase and install it. Use a certified gas service worker for any gas connection, and a qualified electrician for electrical work.

Shop for your new cooker hob at SG Appliances

At SG Appliances we offer a wide selection of quality cooker hobs, including gas hobs, induction hobs and more, all at affordable prices. Browse our collection today and find the perfect replacement for your old cooker hob.

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FAQ

Can I replace a gas hob with an induction hob?

Often yes, but check two things: the cut-out size must suit the new induction hob, and you need a suitable electrical supply, as induction hobs need a power point rather than a gas connection. If your kitchen only has a gas point, you may need an electrician to add a suitable power supply.

What if my new hob's cut-out is different from the old one?

If the new cut-out is larger, your installer can enlarge the opening. If it is smaller, choose a hob whose rim covers the existing hole, or a model with a matching cut-out. Always compare the manufacturer's cut-out drawing with your measured hole before buying.

Do I need a professional to replace a gas hob?

Yes, for the gas connection. The old hob must be disconnected and the new one connected by a certified gas service worker. You should not carry out gas work yourself.

Key points to remember

• Choose the right type (gas stainless steel, gas tempered glass, or induction), see our cooker hob buying guide.
• Measure the cut-out hole accurately (length, width and corner radius) before purchasing.
• Disconnect a gas hob only with a certified gas service worker.
• Match the manufacturer's cut-out size to your countertop opening, not just the overall hob width.
• Check the gas point or power supply position for the new hob.

We hope this guide helps you replace your old built-in cooker hob with confidence. Happy cooking!

Related guides: How to Choose a Cooker Hob · Gas Hob vs Induction Hob · How to Choose a Cooker Hood.