Top 5 Home Repairs You Should Never Do Yourself

One thing can be said about water -- if there's a way out, water will find it. The very smallest leak can lead to thousands of dollars worth of damage if it's not caught in time. If you're a capable do-it-yourselfer and there's existing plumbing in place, you can probably manage some minor repairs like changing a shower head or replacing a faucet. Even installing a new toilet is within the realm of a capable DIY-er (just make sure you have a tight seal). Where you can get into trouble is if you try to modify your plumbing system -- extending hot water lines or re-routing your sewer pipes. Working with hot water means copper pipes, and that requires a blow torch. Unless you have some serious welding experience, it's best to leave the torch jobs to the professionals. While this isn't as dangerous as electric work, plumbing problems can get out of hand fast and lead to an expensive and wet future.

­Any projects involving electricity should be approached with extreme caution. Like plumbing, you may be able to pull off minor repairs like changing a light switch or installing a ceiling fan -- as long as you make sure that your power is turned off before you start. You can test the switch against the breaker so you're positive that there isn't a current, or you can just turn off your master switch to be super sure. You should also invest in a decent volt meter so you can test wires for power. But if the repair goes beyond a simple fixture, it's best to call a professional electrician. In some instances, you have to have a permit to get the work done, and a professional will be your only option. Extending or replacing circuits is dangerous business if you don't know what you're doing. One wrong move could burn your house down, and a shock could result in injury or death. There are also building codes that are mandated for safety purposes; not being up to code may not affect you now, but it will if you ever try to sell your home.

Asbestos is a naturally occurring mineral and has been used for years in older homes and businesses for its insulating properties. It's resistant to heat and electricity and is a good acoustic barrier as well. Unfortunately, asbestos was found to be toxic, and most of its uses were banned in the United States in 1989 by the Environmental Protection Agency (EPA). The ban was overturned in 1991, allowing trace amounts of asbestos in certain products, but the days of using it in large amounts as an insulator were over. While this stopped the mass use of asbestos, there were no provisions for the homes and businesses that already contained it.

Asbestos abatement teams are typically hired to rid commercial properties of the toxic insulation. While it's possible to perform a DIY asbestos removal, it's not recommended. Aside from the inherent dangers of toxicity, there are many laws that govern the removal of asbestos because it can pose a danger to those in close proximity -- like your neighbors. So what's a homeowner to do? Hire a professional.

R­epairing a roof isn't recommended for a do-it-yourselfer for one reason -- it's easy to fall off of. Repairing a roof shingle or two isn't the toughest job in the world, but it's getting up and down and carrying your tools with you that pose the risk of injury or death. It's also very tiring work, and when you're tired, you're more prone to make a mistake. Just a quick slip is all it takes to send you over the edge of a second-story roof.

If you live in a one-story ranch and your slope is less than 20 degrees, you can probably get away with gutter work and minor shingle repair. Your roof may even be low enough to do it from the ladder. But these minor fixes still can be dangerous, and you should never attempt any of them when you're home alone. At the very least, you should have a spotter in place to hold the ladder and be there in case of an accident. Aside from the danger involved, roofing work also requires experience to get it right. If you bite off more than you can chew, you may end up with a leaky roof and expensive water damage.

A typical home may have several different appliances that run on gas. Your clothes dryer, oven and hot water heater are a few. It isn't always a repair that leads people down the path of danger when dealing with gas. Sometimes, it may just be necessary to move the stove because of a floor tiling project or to move a dryer away from a wall that needs painting. Some homeowners feel like a hot water heater replacement is within the realm of their capabilities, and this is when accidents happen. Like water, gas will always find a leak. So while you may have done a good job in cutting off the gas supply line and moving the stove, you may not have been as careful when hooking it back up. The end result of what you thought was a simple fix could lead to accidental carbon monoxide poisoning -- something that kills more than 400 people per year in the United States alone [source: Medscape.com].

For other difficult DIY jobs you should stay away from, see some links on the next page.