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A do-it-yourself approach for home improvement projects may reduce your initial costs — but for certain jobs, the risks far outweigh any potential savings. If any of these projects are on your to-do list, call in the pros unless you’ve got plenty of related experience.1. Roof replacementRoofing is extremely hard and dangerous work. Any upfront savings you might get with a DIY roof replacement could easily be eclipsed by the costs of making expensive mistakes or causing dangerous accidents. Aside from having the skills and tools needed to do a decent job, you’ll also need to climb ladders, lift heavy materials and navigate a steeply pitched surface high above the ground. Risks include:Severe injury or death: Roofers face among the highest risks of work-related injuries and fatalities of any profession, according to the Bureau of Labor Statistics — and that’s for trained professionals. In addition to possible slips and falls from significant heights, there’s also risk of burns from hot bitumen (a petroleum-based roofing material) and electric shock from accidentally touching power lines.Warranty issues: Manufacturer warranties for roofing materials may cover workmanship for a limited time if the materials are installed by qualified contractors, but they generally don’t cover DIY installation.Costly damage: Improper material choice or installation may damage the roof — and if water leaks in, your home’s ceilings, walls, flooring, furnishings and wiring will suffer too.Cost of hiring a proRoofers charge about 0 to 0 per roofing square in addition to the cost of materials, which typically brings the total price of installing a new roof over your existing one to about ,400 to ,900, according to the home services company HomeAdvisor. Removing the old roof or repairing damage can add to that cost.In some cases, homeowners insurance might cover some or all of these expenses. Opting for less-expensive materials can also lower the bill. And if you’re installing an energy-efficient roof that meets certain criteria, you might qualify for a tax credit.2. Mold removalEveryone’s cleaned up a bit of mold at some point, and even the U.S. Environmental Protection Agency gives the green light on DIY mold removal for areas under 10 square feet. But once mold infestation becomes widespread, it might become necessary to open up walls, lift up carpeting or take out fixtures to fully remove it and clean and dry the space thoroughly. A DIY approach, in this case, means risking:Mold exposure: Contact with mold may cause asthmatic reactions, sore throat, skin reactions, allergic reactions, eye and nasal irritation, cough, wheezing, shortness of breath and other lung issues. This is especially a concern if you don’t have access to the proper protective gear. During the COVID-19 pandemic, N95 respirator masks — which offer protection from exposure to mold and other particles — have been largely unavailable for public purchase.Harsh chemical exposure: Chemical cleaners commonly used to kill mold are also harmful to lungs, eyes, nasal passages, throats and skin.Making the problem worse: Improper removal or sealing may release mold spores into the air. If spores get into HVAC systems, mold will blow throughout the house. DIYers may also miss mold lurking in unexpected places like crawl spaces or flooring, which could lead to further damage.Incomplete cleanup: Not properly cleaning up after the job may leave traces of mold behind that will just grow back again.Cost of hiring a proProfessional mold remediation generally costs about ,500 to ,150, or to per square foot, according to HomeGuide, a home services referral website.To make sure that money is well-spent, go with an experienced, well-reviewed mold remediation specialist who can do a thorough job.3. Toilet replacementTo install a new toilet, you’ll have to shut off the water; disconnect, drain and remove the old toilet; and seal and connect the new one. That’s a manageable task for someone with basic plumbing knowledge. But if you’re a DIY newbie, it’s trickier. Risks include:Injury: A toilet can weigh about 100 pounds and is awkward to handle. Homeowners may become injured lifting or carrying the toilet.Fumes: Sewage gasses are odorous, unhealthy and potentially flammable. Failing to stuff a rag in the exposed drain pipe after the old toilet is removed may expose you to dangerous fumes — especially in poorly ventilated spaces. (And forgetting to remove the rag before seating the new toilet will cause a very disturbing plumbing issue.)Toilet damage: Improper installation, overtightening connections or simply dropping the toilet may cause serious damage.Leaks and mold: If the base isn’t sealed properly, water can leak into the floor, damaging and weakening the area while creating just the right conditions for mold and mildew growth.Cost of hiring a proThe average labor cost for basic toilet installation runs between and 0, according to the services marketplace website Thumbtack, and that doesn’t include the price of the toilet. Underlying problems your plumber finds (such as leaky pipes, a cracked flange or leaky valves) can increase costs; disposing of your old toilet also runs about to 0, the site notes.If you’re installing a water-saving toilet, you might qualify for a rebate from your state, which could defray some of these costs.4. Window replacementReplacing drafty old windows can reduce your utility bills — but only if it’s done correctly. Installing a window is a meticulous process, and any mistakes may leave your home unexpectedly vulnerable to the elements. Other pitfalls include:Injury: Windows are heavy and fragile, bringing risk of injuries from broken glass and lifting. Falls from ladders are also a concern, along with harming passersby if a window falls out to the street.Poor energy efficiency: Improper fit or sealing can result in drafts, air leaks and higher energy bills.Water damage: A poor seal could allow water leaks that damage your home’s wood, drywall and even wiring.Home damage: You could accidentally hit a plumbing or electrical line.Warranty issues: Installing your own windows improperly may void all or part of the manufacturer’s warranty.Cost of hiring a proProfessional window installation usually runs between 5 to 0 per window, but can be much more expensive for high-end windows, according to Angie’s List, a website that provides referrals for home services pros. If the frame needs to be replaced, that’s extra.Choosing less-expensive materials reduces upfront costs. And if you’re switching to more energy-efficient windows that meet certain specifications and are professionally installed, you might qualify for rebates in some states.More From NerdWalletHome Inventory Tightened in Q3, and First-Time Buyers Felt the SqueezeMortgage Outlook: Rates Stay Low as December Deadlines LoomThe Property Line: 8 Housing and Mortgage Trends for 2021Roberta Pescow is a writer at NerdWallet. Email: USexpansion@nerdwallet.com. 7040

A hiker fell to his death on Monday while ascending Yosemite National Park's famous Half Dome trail, the US National Park Service said.The hiker was on the trail's Half Dome cables, the park service said in a statement. He was hiking with another person during thunderstorm activity around 4:30 p.m. when he slipped and fell.The cables take hikers up the last 400 feet to the summit of Half Dome, which rises nearly 5,000 feet above California's Yosemite Valley.Park rangers were notified and went to the scene to assist the second hiker, the NPS said. The missing hiker's body was found around 1 p.m. Tuesday.His identity will be released after his family is notified.The death is the first on the Half Dome cables since 2010 and the first visitor fatality in 2018, the park service said. 797

A gunman and three female hostages were found dead at a military veterans home in Northern California on Friday night, officials said, a grim end to a standoff that lasted nearly eight hours.Shortly before 6 p.m., officers stormed into the room where the gunman had held the hostages at the Veterans Home of California in Yountville, said Chris Childs with the California Highway Patrol.They found the gunman and the three hostages dead, he said. The coroner's office identified the victims as Christine Loeber, 48; Jennifer Golick, 42; and Jennifer Gonzales, 29.  577

A couple arrested in Mexico while pushing a baby stroller filled with human body parts may have killed up to 20 women, according to the chief investigator on the case.The man and woman were detained Thursday in the Mexico City suburb of Ecatepec on suspicion of murdering 10 female victims. However, the male suspect has since claimed that they are responsible for twice as many deaths.Police arrested the pair, identified only as "Juan Carlos N." and his wife "Patricia "N.," during an investigation into the disappearance of three women and a two-month-old baby. The man gave detailed accounts of the original 10 deaths. He also told police that he and his wife had killed a further 10 people, according to State of Mexico Prosecutor Alejandro Gomez and reported by AFP.Police found eight plastic buckets full of dismembered body parts and cement in the couple's house, Gomez revealed in a Facebook post on Sunday. More remains were found in a refrigerator, wrapped in plastic bags. Tests are now being carried out on the grisly evidence. 1048

A bodyguard for Las Vegas resident and champion boxer Floyd Mayweather Jr. was shot on Monday in Atlanta, according to multiple reports.A police spokesman told the Atlanta Journal-Constitution that it appears that Mayweather's three-vehicle convoy was targeted. Mayweather was not injured in the shooting. The bodyguard, Gregory La Rosa, was shot in the leg. He was treated at a hospital in Atlanta and released. La Rosa has worked for Mayweather since 2014.Mayweather and his group was traveling from a club to a luxury hotel around 2 a.m. Monday when another vehicle pulled alongside and opened fire.Mayweather is in Atlanta to promote his Showtime-televised triplehead in Las Vegas on Saturday night. He has not commented about the incident on any of his social media accounts.  804