Finding the best built-in microwave for a 30-inch cabinet starts with one important check: the cabinet opening and the microwave’s trim kit must match. A microwave described as “30 inch” may be an over-the-range model or drawer, while a built-in model may need a separate 30-inch trim kit. Compare the appliance’s cutout requirements with your cabinet measurements before you buy.
Quick Comparison
| Product | Type | Capacity | Key fit detail | Best for |
|---|---|---|---|---|
| Frigidaire Gallery GMBS3068BF Stainless Steel | Built-in microwave; trim kit sold separately | 2.2 cu. ft. | 30-inch trim kit available; cutout is 24 3/4" W x 20" D x 16 3/4" H | Most built-in installations |
| GE 30-inch Over-the-Range Microwave | Over-the-range microwave and vent | 1.6 cu. ft. | 29.87" W; designed to mount above a stove | Replacing an over-the-range unit |
| GE Profile PCHK11S1WBB Countertop Microwave | Countertop; optional under-cabinet hanging kit | 1.1 cu. ft. | 24" W; requires open space for airflow | Flexible countertop or hanging-kit use |
| Frigidaire Gallery GMBS3068BF Black Stainless | Built-in microwave; trim kit sold separately | 2.2 cu. ft. | 30-inch trim kit available; confirm cutout dimensions | A built-in look in a darker finish |
| COSMO Haven Collection Microwave Drawer | Built-in microwave drawer | 1.2 cu. ft. | 29.9" W x 23.2" D x 16" H; verify cabinet cutout separately | Drawer-style access and an uncluttered counter |
Our Picks: Best Built In Microwave For 30 Inch Cabinet reviews
Best Overall: Frigidaire Gallery 2.2-Cubic-Foot Built-In Microwave
The Frigidaire Gallery GMBS3068BF is the clearest match here for a built-in cabinet installation. It has a 2.2-cubic-foot interior, sensor cooking, sensor reheating, auto defrost, and 11 power levels. The stainless steel finish gives it a coordinated look, while the listed 30-inch trim kit is designed to frame the appliance in a wider cabinet opening.
Check the actual opening before ordering: the microwave itself measures about 24 7/16 inches wide, and its stated cutout is 24 3/4 inches wide by 20 inches deep by 16 3/4 inches high. The 30-inch trim kit is sold separately, so include that extra part in your installation plan. A 30-inch cabinet label alone does not confirm that the opening or depth is suitable.
Its roomy interior is useful for larger plates and casserole dishes. Some owners find the sensor features convenient for everyday reheating and cooking, and the controls include quick-start options. One practical caveat is that the door-release button may feel firm to some users. This is the strongest all-around choice if you want a conventional built-in microwave rather than a countertop or over-the-range unit.
Pros:
- Generous 2.2-cubic-foot capacity
- Sensor cooking and sensor reheating
- 30-inch trim kit is available separately
- 11 power levels and auto defrost
Cons:
- Trim kit is an additional purchase
- Requires a specific cutout, so measure before buying
Verdict: Choose this Frigidaire if you want a full-size, standard built-in microwave and your cabinet can meet its cutout requirements.
Best for Replacing an Over-the-Range Microwave: GE 30-Inch Model
This GE is a 30-inch over-the-range microwave, not a built-in cabinet model. It combines a 1.6-cubic-foot microwave with a two-speed, 300-CFM ventilation system, so it is meant to mount above a cooktop or range. Its listed dimensions are about 29.87 inches wide, 15.56 inches deep, and 16.12 inches high.
Features include 1,000 watts of cooking power, 10 power levels, one-touch controls, a turntable on/off option, and a replaceable charcoal filter. The vent function makes it a useful option when you want cooking and ventilation in one appliance. It is a poor fit, however, if you are trying to install a microwave inside a cabinet opening away from a range.
Installation depends on the mounting surface and hardware, so do not assume that an existing bracket or old screw holes will line up. Owners have had different experiences when replacing an earlier model, which makes checking the installation instructions and mounting requirements especially important. Compared with the Frigidaire built-in, this GE offers ventilation but less interior capacity and a different installation style.
Pros:
- Combines microwave cooking with a two-speed vent
- 30-inch class width suits many over-the-range spaces
- Turntable can be switched off for certain dishes
- Includes one-touch cooking controls and a child lock
Cons:
- Not designed as a cabinet built-in microwave
- Mounting hardware and existing holes may not match during replacement
Verdict: Pick this GE only if you need an over-the-range microwave and vent; for a cabinet built-in, choose one of the Frigidaire models or consider the drawer.
Best Flexible Option: GE Profile Countertop Microwave
The GE Profile PCHK11S1WBB is a 1.1-cubic-foot countertop microwave with 800 watts of cooking power. It measures 24 inches wide, 12.87 inches deep, and 11.87 inches high. An optional hanging kit can let you install it beneath cabinets, but the product is still described as a countertop model rather than a standard built-in microwave with a trim kit.
Its features include sensor cooking, 10 power levels, scan-to-cook technology, and Wi-Fi connectivity with Alexa and Google Assistant. The smaller capacity may suit everyday reheating and modest kitchen spaces, but it gives you less room than the 2.2-cubic-foot Frigidaire. GE specifies airflow clearances of 3 inches on each side and above, 1 inch at the rear, and an unobstructed bottom. Those requirements matter if you are thinking about placing it in or under a cabinet.
This is the most adaptable pick if you want the option of countertop use or a compatible hanging kit and are comfortable following the clearance instructions. It is not the best choice if you need a finished built-in appearance that fills a 30-inch opening. Confirm that the hanging kit is available and compatible before planning an under-cabinet installation.
Pros:
- Compact 24-inch width
- Sensor cooking and 10 power levels
- Wi-Fi connectivity and voice assistant compatibility
- Can be used with an optional under-cabinet hanging kit
Cons:
- Not a purpose-built 30-inch cabinet microwave
- Lower capacity and cooking power than the Frigidaire built-in models
Verdict: Consider this GE if flexibility and smart features matter more than a true built-in finish, and make sure your setup allows the required airflow.
Best Dark Finish: Frigidaire Gallery Built-In Microwave in Black Stainless
This listing is a black stainless version of the Frigidaire Gallery GMBS3068BF. It has the same stated 2.2-cubic-foot capacity and built-in format as the stainless steel model, with a 30-inch trim kit available separately. The listed appliance dimensions are about 24.42 inches wide, 19.63 inches deep, and 13.63 inches high.
The product information identifies sensor cooking, a child safety lock, and 1,100 watts. The black stainless finish can be a better visual match for kitchens with darker appliances, but confirm the finish and trim kit details before ordering. As with the stainless model, the cabinet cutout—not just the cabinet’s nominal width—determines whether the unit can be installed correctly.
This is a useful alternative if you like the Frigidaire’s capacity and built-in format but prefer a dark finish. The product information is less detailed about its controls and cooking programs than the stainless listing, so check the current specifications for the exact version you plan to buy. The main trade-off is the same as with the other Frigidaire: the trim kit is separate, and installation depends on the required opening.
Pros:
- Large 2.2-cubic-foot interior
- Built-in design with a 30-inch trim kit available
- Black stainless finish for darker appliance suites
- Sensor cooking and child safety lock listed
Cons:
- Trim kit is sold separately
- Confirm finish, cutout, and trim kit compatibility before purchase
Verdict: Choose this model if you want the Frigidaire built-in format in black stainless and your cabinet meets the installation requirements.
Best Drawer Style: COSMO Haven Collection Built-In Microwave Drawer
The COSMO Haven Collection is a built-in microwave drawer with a 1.2-cubic-foot capacity and 1,000 watts of power. Its listed exterior dimensions are 29.9 inches wide, 23.2 inches deep, and 16 inches high. The drawer format gives you a different way to access the microwave than a standard door-front model and can help keep the counter clear.
Controls include 10 power levels and presets for melt, soften, popcorn, and beverages. It also offers weight- or time-based defrosting, a defrosting rack, and a child lock. The product information lists a one-year limited warranty. Since the available specifications give exterior dimensions but not a full cabinet cutout requirement, check the manufacturer’s installation instructions before you plan the opening.
Compared with the Frigidaire, this model offers less interior capacity but uses a drawer format and has an exterior width close to 30 inches. That width alone does not confirm a fit: cabinet depth, height, electrical access, and the required cutout all need to be checked. A drawer is worth considering if you prefer that style, but it is a different installation choice from a trim-kit microwave.
Pros:
- Built-in drawer format with a 29.9-inch exterior width
- 1,000 watts and 10 power levels
- Preset options and weight- or time-based defrosting
- Child lock and included defrosting rack
Cons:
- Smaller capacity than the Frigidaire models
- Cabinet cutout details should be confirmed before installation
Verdict: Pick the COSMO if you specifically want a built-in drawer and can verify that its installation requirements suit your cabinet.
How to Choose a Built-In Microwave for a 30-Inch Cabinet
Measure the cabinet opening, not just the cabinet width
A cabinet described as 30 inches wide may not have a 30-inch clear opening. Measure the opening’s width, height, and depth, and compare those numbers with the microwave’s installation requirements. For the Frigidaire stainless model, the listed cutout is 24 3/4 inches wide, 20 inches deep, and 16 3/4 inches high. The outer trim kit creates the finished look; it does not mean the appliance itself is 30 inches wide.
Choose the right installation type
Built-in microwaves, countertop microwaves, over-the-range models, and microwave drawers are not interchangeable. A trim-kit microwave fits into a cabinet opening and uses a frame around the appliance. An over-the-range model mounts above a stove and includes ventilation. A countertop model may be used under a cabinet only with the proper hanging kit and required clearances. A drawer has its own cabinet and installation needs.
Check whether the trim kit is included
Both Frigidaire Gallery listings state that the trim kit is sold separately, with a 30-inch kit available. Confirm the exact kit model and compatibility with the microwave before you buy. Do not assume that an existing trim kit will fit a replacement appliance, even if the older unit came from the same product line.
Match capacity to the dishes you use
The Frigidaire models offer 2.2 cubic feet, while the GE Profile has 1.1 cubic feet and the COSMO drawer has 1.2 cubic feet. A larger interior can be useful for larger plates and dishes, but capacity alone does not tell you whether a particular dish will fit. Check the interior layout and turntable dimensions when those details are important to you.
Consider power and cooking features
Compare the stated cooking wattage, power levels, and features you will actually use. The Frigidaire listings include sensor cooking, and the stainless model also lists sensor reheating and auto defrost. The COSMO includes several presets and timed or weight-based defrosting. The GE Profile adds smart connectivity and scan-to-cook features, while the over-the-range GE combines cooking with a vent.
Plan for airflow, electrical access, and installation
Follow the installation instructions for clearances, ventilation, and electrical access. The GE Profile listing specifies open space around the unit and an unobstructed bottom, so it should not be enclosed like a conventional built-in model without the approved hanging kit and setup. For any cabinet installation, confirm the required outlet location and whether professional installation is needed for your kitchen.
Frequently Asked Questions
Can I install a built-in microwave in any 30-inch cabinet?
No. The cabinet’s stated width does not confirm that the opening has the right dimensions. Check the microwave’s cutout requirements, trim kit, depth, height, and installation instructions before purchasing.
Does the Frigidaire GMBS3068BF include a 30-inch trim kit?
No. The product information says the trim kit is sold separately. A 30-inch trim kit is available, but confirm the correct kit model and compatibility with the microwave.
Is the GE 30-inch microwave a built-in cabinet model?
No. It is an over-the-range microwave designed to mount above a stove. It also has a ventilation system, which makes it a different type of appliance from a cabinet built-in microwave.
Can the GE Profile countertop microwave go under a cabinet?
The listing says it can be installed beneath cabinets with an optional hanging kit. It also specifies airflow clearances, so use the appropriate kit and follow the installation instructions rather than enclosing it in a cabinet opening.
Is a microwave drawer a good choice for a 30-inch cabinet?
It can be, if you want the drawer format and your cabinet meets the model’s installation requirements. The COSMO’s listed exterior width is 29.9 inches, but you should confirm its required cutout and cabinet depth before deciding.
Which option is best for most built-in installations?
The Frigidaire Gallery GMBS3068BF in stainless steel is the most straightforward choice among these products for a conventional built-in installation. It has a large capacity and an available 30-inch trim kit, but you must buy the kit separately and verify the cutout.
Final Recommendation
For a standard built-in microwave in a 30-inch cabinet, the Frigidaire Gallery GMBS3068BF is the strongest overall fit, provided your cabinet meets the cutout requirements and you purchase the matching trim kit. Choose its black stainless version if you prefer a darker finish. The COSMO is the alternative for a drawer-style installation, while the GE models suit over-the-range or countertop setups rather than a conventional built-in opening. Always confirm measurements and installation details before ordering.
