What You Need to Know Before Starting
Replacing a double oven is a project you can do yourself if you have basic carpentry skills and the right tools, but it requires careful planning around electrical and gas connections. Most double ovens are either electric or gas-powered, and the installation method depends on which type you have and how your current unit is wired or piped. Before you buy a new oven, measure your existing cabinet opening, check whether your electrical panel has the capacity for a new unit, and confirm whether you need a licensed electrician or plumber to handle the connections in your area.
The actual removal and installation typically takes four to eight hours, not counting the time needed for any electrical or gas work. You will need to turn off power at the breaker or shut off the gas supply, disconnect the old unit, prepare the cabinet space, and then install and connect the new one. This guide covers the mechanical steps; for electrical or gas connections, you may need to hire a professional depending on your local building codes and your comfort level with those systems.
Key Takeaways
- Measure your cabinet opening width, height, and depth before shopping, because double ovens come in standard sizes but your cabinet may not match them exactly.
- Turn off power at the breaker (electric) or shut off the gas valve (gas) before you disconnect anything, and do not restore power until the new unit is fully installed and tested.
- Most jurisdictions require a licensed electrician to connect a new electric oven and a licensed plumber to connect a new gas oven, so check your local building department before you start.
- Remove the old oven by unbolting it from the cabinet frame, then disconnect the power or gas line—do not cut wires or pipes yourself.
- Install the new oven by sliding it into the opening, bolting it to the cabinet frame, and then having a professional make the final electrical or gas connections.
Measure Your Cabinet Opening and Check Clearances
Start by measuring the width, height, and depth of your existing cabinet opening. Use a tape measure to find the inside dimensions of the cabinet—measure from the inside left edge to the inside right edge for width, from the bottom to the top for height, and from the front face of the cabinet to the back wall for depth. Write these numbers down and bring them with you when you shop. Standard double wall ovens are typically 27 inches wide, but some are 30 inches; heights range from 45 to 51 inches, and depths vary depending on whether the oven sits flush with the cabinet face or protrudes slightly.
Check the clearance around your cabinet opening as well. You need at least 1 inch of clearance on each side of the oven for heat to circulate, and the cabinet frame itself must be sturdy enough to support the weight of the new unit—most double ovens weigh between 150 and 250 pounds. If your cabinet frame is damaged, cracked, or not square, you may need to reinforce or rebuild it before installing the new oven. Look at the back of the cabinet too: you need clear access to the electrical outlet or gas line, and enough space behind the oven for the power cord or gas line to connect without kinking.
Turn Off Power or Gas and Disconnect the Old Oven
If your oven is electric, locate your home's electrical panel and switch off the breaker that controls the oven circuit. The breaker should be labeled, but if you are not sure which one it is, switch it off and have someone test the oven to confirm the power is gone. If your oven is gas, locate the gas shut-off valve—usually a small lever on the gas line near the oven or on the main gas line entering your home—and turn it perpendicular to the pipe to shut off the gas. Leave the oven door open for a few minutes to let any remaining gas escape.
Once power or gas is off, open the oven door and look for bolts or screws that attach the oven to the cabinet frame. These are usually on the sides or top of the oven, inside the cabinet. Remove these bolts with a wrench or socket set, and have someone help you support the oven as you loosen the last bolt—a double oven is heavy and can tip forward if not supported. Carefully slide the oven out of the cabinet opening toward you, stopping when you can reach the power cord or gas line behind it. For an electric oven, unplug the power cord from the outlet. For a gas oven, use a wrench to disconnect the gas line at the fitting—turn the fitting counterclockwise until it comes free. Do not cut the gas line or power cord yourself; always disconnect at the fitting or outlet.
Prepare the Cabinet Opening and Install the New Oven
Once the old oven is out, clean the inside of the cabinet opening with a vacuum and damp cloth to remove dust and debris. Check that the cabinet frame is level using a spirit level placed on the bottom edge—if it is not level, you can shim it with thin metal or plastic shims until it is. Inspect the cabinet frame for damage; if there are cracks, splits, or areas where the wood is soft or rotted, reinforce those spots with additional framing or plywood before you install the new oven.
Slide the new oven into the opening, aligning it carefully so it sits flush with the cabinet face and is centered left to right. The oven should slide in smoothly; if it binds or sticks, stop and check that the opening is square and the oven is aligned. Once the oven is fully inserted, bolt it to the cabinet frame using the bolts that came with the new unit or the original bolts if they fit. Tighten the bolts evenly—do not fully tighten one side before the other, or the oven may sit crooked. Use a level to confirm the oven is plumb (vertical) and level (horizontal) before you fully tighten all bolts.
Connect Power or Gas (Professional Installation Recommended)
At this point, your new oven is mechanically installed but not yet connected to power or gas. Most building codes require a licensed electrician to connect a new electric oven and a licensed plumber to connect a new gas oven. Contact your local building department to find out what is required in your area before you proceed. If you are allowed to do the work yourself, the steps are different for electric and gas ovens, and mistakes can create fire or shock hazards.
For an electric oven, a licensed electrician will connect the power cord to the outlet or hardwire the oven to your electrical panel, depending on your oven model and local code. For a gas oven, a licensed plumber or gas fitter will reconnect the gas line to the oven, test the connection for leaks using soapy water, and confirm that the oven lights and heats properly. Once the connection is complete, the electrician or plumber will turn the power or gas back on and test the oven to make sure it works. Do not turn on power or gas yourself until a professional has inspected and approved the connection.
Test the New Oven and Adjust Settings
After the power or gas is restored and the oven has been tested by the electrician or plumber, run the oven empty at 350 degrees Fahrenheit for 15 to 20 minutes to burn off any manufacturing oils or residue. You may notice a slight smell or smoke during this process—this is normal and should stop after the first use. Open windows or turn on your range hood to ventilate the kitchen. Do not leave the oven unattended during this initial burn-in period.
Once the oven has cooled, check the temperature accuracy using an oven thermometer placed on the center rack. Set the oven to 350 degrees and let it preheat for 20 minutes, then check the thermometer. If the actual temperature is more than 25 degrees off from the set temperature, consult your oven manual for instructions on calibrating the thermostat. Most modern ovens have a calibration function accessible through the control panel. Read your manual to learn how to use the convection setting (if your oven has one), set the clock, and program any other features you want to use.
Common Mistakes to Avoid
The most common mistake is not measuring the cabinet opening before buying a new oven, which can result in an oven that does not fit or leaves large gaps around the edges. Always measure twice and compare your measurements to the oven specifications before you purchase. Another frequent error is failing to check local building codes—in many areas, you cannot legally install an oven yourself, and doing so can void your warranty, create liability if something goes wrong, and fail a home inspection.
Do not attempt to disconnect or reconnect electrical or gas lines yourself unless you have been trained and your local code permits it. Improper electrical connections can cause fires or electrocution, and improper gas connections can cause gas leaks or carbon monoxide hazards. Always hire a licensed professional for these connections. Finally, do not restore power or gas until the oven is fully installed and the connections have been inspected and approved by a professional. Turning on power or gas prematurely can damage the new oven or create a safety hazard.
Frequently Asked Questions
Do I need a permit to replace my oven?
Most jurisdictions require a permit for oven replacement, especially if the oven is gas or hardwired to your electrical panel. Contact your local building department before you start to find out what permits you need and whether the work must be done by a licensed contractor. Skipping the permit can result in fines and problems when you sell your home.
Can I install an oven that is a different size than my old one?
Only if the new oven fits your cabinet opening. If the new oven is smaller, you will have gaps around the edges that you can cover with trim or filler panels. If the new oven is larger, you will need to modify the cabinet opening, which may require removing or relocating adjacent cabinets. Measure carefully before you buy.
How long does it take to install a double oven?
The mechanical installation—removing the old oven and installing the new one—typically takes four to eight hours. Add time for any electrical or gas work, which a professional may need one to two hours to complete. The total project, including the initial burn-in, usually takes one full day.
What should I do if my new oven does not heat evenly?
First, confirm that the oven is level and that nothing is blocking the vents inside the oven cavity. Check your manual for the calibration procedure and adjust the thermostat if needed. If the problem persists, contact the manufacturer's customer service—the oven may have a defect and could be covered under warranty.
Can I use my old oven's power cord or gas line with the new oven?
Not always. The power cord or gas line must match the specifications of the new oven, which are listed in the manual. If the old cord or line does not match, a licensed electrician or plumber will install a new one that does. Never reuse electrical or gas connections that do not match the new equipment.