CornerStone United sets itself apart from the competition by covering multiple types of vehicles including RVs, powersports, and marine crafts. It also offers coverage for manufactured home structure and HVAC systems. Drivers can purchase these plans through dealerships and manufacturers, not directly from CornerStone United.

In this review, we’ll go through the extended warranty company’s strengths and weaknesses, so you’ll know what to do if you come across one of its plans at a dealership. Our team of experts has reviewed and ranked the best extended warranty companies in the industry. To find out what you’d pay for contract on your car, get free quotes from multiple reputable providers and compare coverage side by side.

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In This Review:

    About CornerStone United

    CornerStone United has been around for over 40 years, which is a long time for a warranty company. Its plans are available across all 50 states and also in Canada. As far as vehicles go, the company can cover cars that other providers wouldn’t necessarily cover. These include vehicles with many miles and modifications like lift kits or oversized tires.

    CornerStone auto programs are backed by insurers that have an industry rating of “A-” or above. CornerStone United itself has an A+ rating from the Better Business Bureau (BBB), but it has an average customer rating with a number of negative reviews. If you’re looking for a good Acura extended warranty, there may be better options. But if you want to cover a boat or motorcycle, CornerStone could be a good choice.

    CornerStone United Pros

    CornerStone United Cons

    Wide range of plans with custom options

    Limited availability

    Coverage for cars, RVs, boats, motorcycles, and more

    Negative customer reviews

    A+ BBB rating

    CornerStone United Extended Warranty Coverage

    CornerStone offers about a dozen different plans, and that doesn’t include optional add-ons or customization. Of course, not every vehicle will be eligible for every plan, but you’re certain to have a handful of options to choose from with CornerStone United.

    CornerStone Auto

    CornerStone’s standard vehicle service contract includes four coverage levels and five deductible options. Here are the facts:

    • Covers up to 200,000 miles for vehicles 19 years old or newer
    • Covers new vehicles up to 8 years/150,000 miles, with the option to add up to 4 years/50,000 miles afterward
    • Covers used vehicles up to 5 years/75,000 miles from current age and mileage
    • Options for commercial snowplows, lift kits, oversized tires, consequential damage, and mobility equipment

    The four CornerStone United plan options are Powertrain (five systems covered), Basic (13 systems), Select (18 systems), and Ultimate (all parts except specified exclusions). Deductible options are $0, $50, $100, $200, or a disappearing $100 deductible.

    Exclusions under Ultimate and other factory-like contracts include:

    CornerStone Auto plans come with the following benefits:

    • Roadside assistance of up to $100 per occurrence
    • Rental car coverage of up to $200 per occurrence (additional $200 for major system repairs)
    • Trip interruption of up to $200 for food and lodging if 100 miles away from home after a breakdown

    Xtended Auto

    CornerStone United’s Xtended Auto plan is available for any age or mileage of vehicle. Drivers can customize coverage from basic powertrain to comprehensive component coverage. It’s a good option for cars that wouldn’t qualify for plans from other companies.

    Extended Care

    CornerStone Extended Care plans are available for vehicles that have up to 200,000 miles at the time of sale or are 20 years old or newer. The four coverage options are Engine & Transmission (four systems), Powertrain Plus (seven systems), Advantage (nine systems), and Supreme (12 systems).

    The Supreme plan offers coverage on day one, while the other three require a waiting period of 30 days and 1,000 miles. Short-term contracts of three to six months also don’t have a waiting period.

    Extended Care plans come with deductible options of $100 or $250. Benefits include rental car and towing reimbursement.

    Limited Warranties

    CornerStone United’s limited warranty program can extend factory warranties or provide original warranty coverage through manufacturers, dealers, and auction partners.

    Tire And Wheel Protection

    With these plans, drivers can protect tires and wheels from road hazard and cosmetic damage. Plans come in one- to five-year terms. They don’t require a deductible, and they can apply to vehicles up to 14 years/150,000 miles.

    Road hazard damage is damage from metal, rocks, nails, potholes, screws, glass, and debris. The three plan options are:

    • Basic: Repairs or replaces damaged tires
    • Select: Repairs or replaces damaged tires and wheels
    • Ultimate: Expands coverage to include cosmetic damage and curb rash

    Guaranteed Asset Protection (GAP)

    This program covers the difference between your car’s actual value and the amount you have left on your loan if your vehicle is totaled. An upgraded option provides an additional $1,000 toward vehicle replacement.

    Other Programs

    CornerStone United offers the following plans for specialty vehicles:

    • Powersports: CornerStone can cover motorcycles, UTVs, ATVs, scooters, watercraft, snowmobiles, and jet boats. Benefits include rental units, pick-up service, and roadside assistance. GAP coverage and tire/wheel plans are also available for road motorcycles and scooters.
    • RV: Recreational vehicles up to 15 years old and with fewer than 100,000 miles are eligible for a variety of coverage plans. CornerStone covers anything from weekend campers to million-dollar motorhomes.
    • Marine: CornerStone covers new and used crafts that use either gasoline or diesel motors. Basic motors and drives are covered with optional accessory packages for anything from trailers to navigation.
    • Manufactured housing: CornerStone can cover structural items and a range of systems for manufactured homes. It’s one of the largest providers of manufactured home service contracts.

    Cost Of A CornerStone United Extended Warranty

    If your repair is covered, all you’ll have to pay is the deductible. But as for total warranty cost, that’s up to the selling dealer to decide. Dealers can price programs differently as long as they stay within a certain range, so you should be prepared to negotiate if you come across a CornerStone extended warranty.

    The cost will be affected by the mileage, make, and model of your vehicle (or the vehicle you’re looking to buy). Coverage would cost more for a vehicle with higher mileage, since the likelihood of car repairs is also higher.

    How CornerStone United Extended Warranties Work

    Since CornerStone operates through dealers, manufacturers, and auction partners, there isn’t a quote form online. When you are presented with a CornerStone plan at a dealership, your only chance to buy it is when you buy the vehicle. Our recommendation is to read the entire customer contract and ask questions about the fine print before deciding.

    CornerStone allows drivers to go to any licensed repair facility across the U.S. or Canada for coverage. The repair shop will need to be authorized before a repair can be made. You can get rental reimbursement only if the repair is covered by the contract.

    Contracts are cancellable and transferable, but exact terms depend on the dealer that sold the plan.

    CornerStone United Reviews

    CornerStone United offers many different plans, but customer service is another story. Most online reviews are negative and mention how CornerStone refuses to honor claims. There are a few positive reviews, too. Here are a few examples:

    “About four to five weeks after we left the dealer the engine blew up! Simply put, the company called it sudden failure after it was inspected. They paid the dealer and gave us a rental for five days. Her car runs perfect and all I had to do was pay a $100 deductible.”
    – T.K., BBB

    “After the inspection was done everything seemed fine until it was time for the part to be replaced. CornerStone refused to honor my warranty giving me different reasons every time.”
    – John E., BBB

    “I bought the top-of-the-line warranty. Every claim I have made was denied or reduced. So, in four years I have been reimbursed $36. That is $36 total, on a warranty I paid almost $5,000 for.”
    – Chad W., BBB

    Bottom Line On CornerStone United: 3.0 Stars

    CornerStone United offers a huge array of coverage plans for many different types of vehicles. However, many customers have had negative experiences with the company, so we rate CornerStone average compared to other extended warranty providers.

    Reputation

    3.5

    Coverage

    4.0

    Price

    3.5

    Customer Experience

    1.5

    Overall Rating

    3.0

    Top Recommendations For Extended Car Warranties

    The best way to shop for an extended warranty is to compare coverage from different providers. If you only get one quote, who’s to say whether it’s a good deal? Since prices are personalized, get quotes from multiple reputable companies to compare your options.

    Endurance: 4.6 Stars

    If you have a CornerStone plan, you’ll have to work with three different entities: the dealership, CornerStone, and the contract administrator. Endurance, on the other hand, cuts out the middlemen and administers its own plans as a direct provider. You won’t have to deal with a dealership because you can purchase an extended warranty directly from the company.

    Endurance has been in business for more than 15 years. It offers six levels of protection from basic to factory-like coverage. The company has a rating of “Excellent” from over 800 reviews on Trustpilot and offers a host of plan benefits including roadside assistance.

    Get a free quote from Endurance to see how much you would pay for coverage.

    CarShield: 4.2 Stars

    If staying under budget is important to you, you should definitely check out CarShield. When we compared quotes from multiple providers, we found that CarShield offered some of the most affordable options.

    CarShield has been in business for more than 15 years and has been featured on ESPN, CNN, and HGTV. It offers six plans that can accommodate specialty vehicles like ATVs and motorcycles. CarShield is also the most popular provider we’ve reviewed. It has over 13,000 customer reviews between Google and Trustpilot and has 4.0-star ratings from each.

    Learn more about CarShield by getting a free quote for your vehicle.