What Home Repair Projects Should You Not Do Yourself?

There’s nothing wrong with doing your own home repairs. Learning how to maintain your home can save money and make it easier to deal with small problems before they become big ones. The trick is knowing where DIY should stop. You can paint walls, patch small holes, replace hardware, unclog simple drains, weatherstrip doors, caulk gaps, and tackle plenty of other projects without turning every weekend into a contractor visit.

Other projects aren’t worth the risk. Electrical work can cause shocks or fires, plumbing mistakes can flood your home, and structural changes can affect the building’s stability. Some repairs may also require permits, inspections, licenses, or specialized equipment.

Before grabbing your toolbox, consider what could happen if the repair goes wrong. If the answer includes fire, electrocution, flooding, a gas leak, structural damage, serious injury, or violating local building codes, it may be time to call a professional.

Key takeaways

• Leave potentially dangerous electrical, gas, structural, and major plumbing work to qualified professionals.
• Don’t remove or alter a wall until you know whether it’s load-bearing or contains electrical wiring, plumbing, or other systems.
• Roof repairs come with a significant fall risk and can cause water damage if they’re done incorrectly.
• HVAC and gas appliance repairs can involve electricity, fuel, refrigerants, combustion, and ventilation.
• Asbestos, lead, and significant mold problems may require specialized testing, containment, or removal procedures.
• Foundation problems can signal larger structural issues, not just cosmetic repairs.
• Some home projects require permits, inspections, or licensed contractors.
• Check local requirements before starting major renovations or repairs.
• If you’re unsure whether a project is safe to DIY, a professional assessment can help you understand what you’re dealing with before you start.

Major electrical work

Changing a lightbulb is one thing. Working inside your home’s electrical system is another. Electrical mistakes can result in shocks, burns, damaged electronics, or fires. Problems can also remain hidden behind walls until something goes wrong. Projects involving new circuits, electrical panels, service upgrades, rewiring, or other significant electrical work are generally better left to a qualified electrician.

Even something that looks simple can get more complicated once you open the wall or electrical box. You may find old wiring, damaged wires, overloaded circuits, improper previous repairs, or other issues. Electrical work may also require permits and inspections depending on the project and where you live. All in all, it’s better left to a professional.

Gas line repairs

If a repair involves a gas line, bring in a qualified professional. A leaking or incorrectly installed gas line can create a fire, explosion, or carbon monoxide hazard.

This includes work involving gas lines connected to:

• Furnaces
• Water heaters
• Stoves
• Ovens
• Dryers
• Fireplaces
• Outdoor appliances

If you smell gas, don’t start taking things apart to find the leak. Follow your gas utility’s emergency instructions and leave the area when directed.

Gas appliance installation and repair

The appliance itself may also require professional attention. Gas furnaces, water heaters, ranges, fireplaces, and other fuel-burning appliances need the correct fuel connections and ventilation. Improper combustion or venting can potentially allow carbon monoxide to build up inside the home. Follow the manufacturer’s installation and service requirements, and use a qualified professional when required.

Major plumbing repairs

Some small plumbing jobs may be manageable for an experienced DIYer. Major plumbing work is different.

A poorly installed pipe or connection can leak behind a wall, underneath a floor, or inside a ceiling without being immediately obvious. By the time you notice the problem, you could be dealing with damaged drywall, flooring, cabinets, insulation, or framing.

Consider calling a plumber for jobs involving:

• Moving water supply lines
• Moving drain lines
• Replacing major sections of pipe
• Sewer lines
• Main water lines
• Significant leaks inside walls
• Plumbing renovations
• Persistent drainage problems

Sewer line repairs

Sewer repairs can involve buried pipes, specialized cameras and equipment, excavation, and exposure to wastewater. Plus, the problem may also be somewhere you can’t see. Tree roots, collapsed pipes, broken connections, corrosion, or other issues can cause similar symptoms. A professional can determine what’s actually happening before you start tearing apart your yard or plumbing.

Removing a load-bearing wall

Opening up your floor plan may look straightforward on a home renovation show. In reality, removing the wrong wall can compromise your home’s structure. A load-bearing wall supports weight from other parts of the building. Removing or altering it may require beams, posts, footings, or other structural changes to safely transfer that weight.

And even a wall that isn’t load-bearing may contain:

• Electrical wiring
• Plumbing
• HVAC ducts
• Gas lines
• Communications wiring

Before removing a wall, have someone qualified determine what’s inside it and whether it has a structural role.

Structural repairs

Structural repairs aren’t a good place for trial and error. Problems involving beams, joists, rafters, columns, trusses, or other structural components can affect much more than the visibly damaged area. Call a qualified professional if you discover sagging, significant movement, damaged structural components, or other signs that the home’s structure may be compromised. The visible damage may be a symptom of a larger problem.

Foundation repairs

A crack doesn’t necessarily tell you why the foundation is having trouble. Foundation issues may be related to soil movement, drainage, water, construction, settling, or other structural conditions.

Watch for signs such as:

• Growing foundation cracks
• Large wall cracks
• Uneven or sloping floors
• Doors or windows that suddenly stick
• Gaps around windows or doors
• Walls separating from ceilings or floors
• Bowing walls

A professional assessment can help determine whether you’re looking at a cosmetic issue or something more serious. Simply filling a crack may hide the symptom without addressing the cause.

Major roof repairs

Roof work involves two major risks: falls and water damage. Even a relatively low roof can be dangerous, particularly when it’s steep, wet, icy, damaged, or difficult to access.

The repair itself can also be tricky. If roofing materials, flashing, underlayment, or other components are installed incorrectly, water may work its way into the house.

A small leak can eventually damage:

• Insulation
• Drywall
• Ceilings
• Framing
• Flooring
• Electrical components

Call a roofer for significant leaks, structural roof damage, large areas of missing material, or repairs you’re not equipped to handle safely.

HVAC repairs

Changing an HVAC filter and performing basic homeowner maintenance recommended by the manufacturer is very different from repairing internal components. Heating and cooling systems can involve high-voltage electricity, motors, capacitors, fuel, combustion, refrigerants, and pressurized components. That’s a lot happening inside one system. Call an HVAC professional when the problem involves components you aren’t trained to service.

Refrigerant work

Don’t attempt to add, remove, or handle HVAC refrigerant yourself. Refrigerant systems require specialized equipment and knowledge. There are also environmental and regulatory requirements surrounding the handling of certain refrigerants. If your air conditioner is low on refrigerant, the system may have a leak that needs to be located and repaired rather than simply refilled.

Major mold removal

Finding a tiny patch of mildew around a damp area isn’t the same thing as discovering widespread mold after a major leak. Consider professional help for extensive growth, recurring problems, contaminated HVAC systems, significant water damage, or situations where you’re unsure how far the problem extends. Large or recurring mold problems may indicate an underlying moisture problem that needs to be corrected. Simply cleaning the visible surface won’t necessarily solve the problem if moisture keeps entering the area. 

Asbestos removal

Older homes often contain asbestos-containing materials. Depending on the home’s age and construction, asbestos may be found in certain insulation, flooring, siding, roofing, textured materials, and other building products. 

Don’t start sanding, cutting, drilling, scraping, or demolishing suspected asbestos-containing materials simply to see what’s underneath. Testing and removal require trained professionals and specific procedures. Doing it yourself can cause serious health conditions.

Lead paint removal

Older homes can also contain lead-based paint. Sanding, scraping, cutting, or demolishing painted surfaces can create contaminated dust and debris. This can be especially concerning in homes with young children.

If you’re renovating an older home, find out whether lead paint may be present before creating a cloud of dust with a sander. You can get a testing kit at your hardware store. If there’s lead, bring in professionals. 

Major water damage repairs

Water can get into places you can’t see. A wet patch on the wall may be only a small part of the problem. Significant leaks, flooding, sewage backups, or long-term water intrusion can affect drywall, insulation, flooring, subflooring, framing, and electrical systems.

Major water damage may require professional water extraction, drying equipment, moisture testing, cleaning, or removal of damaged materials.

Garage door spring repairs

A garage door may look like a relatively simple system, but its springs can be under substantial tension. That stored energy helps lift a door that can weigh hundreds of pounds. Trying to adjust, remove, or replace high-tension garage door springs without the right training and equipment can cause serious injuries. If the spring breaks or the door suddenly becomes difficult to lift, call a garage door professional.

Tree removal near your home

Cutting down a small shrub isn’t the same as taking down a mature tree. Large trees can fall unpredictably, particularly when they’re dead, diseased, leaning, storm-damaged, or close to buildings. Branches may also be near electrical lines.

Call a tree professional when a tree could fall on your home, another structure, a person, a vehicle, or a utility line. And never attempt to work around power lines yourself.

Major chimney repairs

Chimneys must safely contain and vent combustion gases while also withstanding the weather. Cracked masonry, damaged flue liners, deteriorating mortar, or other problems may be difficult to assess. Working on the roof also involves fall risk. It’s best to let professionals handle it.

Major fireplace repairs

A fireplace is another area where a repair can affect fire safety and ventilation. Cracks, damaged components, venting issues, or gas fireplace problems require professional evaluation. 

Repairs that require specialized equipment

Sometimes the job itself isn’t impossibly complicated. The problem is that you don’t have the equipment needed to do it safely. Factor training and safety into your decision, not just whether the equipment is available at a rental counter.

Think twice about DIY projects that require:

• Scaffolding
• Excavation equipment
• Heavy machinery
• Welding equipment
• High-powered cutting tools
• Electrical testing equipment
• Specialized safety equipment

Repairs that require permits or inspections

Before starting a major project, check your local permit requirements. Electrical, plumbing, structural, HVAC, additions, major remodeling, and other types of work may require permits or inspections depending on where you live. 

Don’t assume you can skip a permit simply because you’re doing the work yourself. Unpermitted or incorrectly completed work can create headaches later, particularly when you sell the home or have additional work performed.

How do you know when to call a professional?

Before starting a repair, ask yourself a few questions:

• Could a mistake cause a fire?
• Could I be electrocuted?
• Could the project create a gas or carbon monoxide hazard?
• Could a mistake cause major flooding?
• Could the repair affect the home’s structure?
• Is there a serious fall risk?
• Could hazardous materials be involved?
• Does the project require specialized equipment or training?
• Do I know what’s behind the wall, ceiling, or floor I’m about to open?
• Does my area require a permit, inspection, or licensed professional?
• Do I understand how to tell whether the repair was completed correctly?

If you’re answering “yes” to the risk questions or “no” to the knowledge questions, hiring a professional may be the safer choice.

FAQ

What home repairs should you not do yourself?

Qualified professionals should handle major electrical, gas, structural, roofing, plumbing, HVAC, foundation, and hazardous-material projects. Also consider professional help when a project involves a substantial risk of falling, flooding, fire, or serious injury.

What electrical work should you not DIY?

A qualified electrician should handle work involving electrical panels, service upgrades, new circuits, significant rewiring, or electrical problems you can’t confidently diagnose. Local rules may also require permits, inspections, or a licensed electrician.

Can you remove a wall yourself?

Don’t remove a wall until you know whether it’s load-bearing and what’s inside it. Walls can contain electrical wiring, plumbing, ducts, and gas lines. Structural changes may require professional planning, permits, and inspections.

Should you repair your own roof?

Some homeowners can handle minor maintenance, but roof work carries a serious fall risk. Improper repairs can also allow water into the home. Roofing professionals should handle significant leaks, structural damage, and roof replacement.

Can you repair a gas line yourself?

Improper gas-line work can create fire, explosion, and carbon monoxide risks. Use a qualified professional for gas-line installation and repairs, and follow your utility’s emergency instructions if you suspect a gas leak.

Can homeowners do their own plumbing?

Some minor plumbing tasks may be manageable, but major work involving supply lines, drains, sewer lines, hidden leaks, or extensive renovations may require a plumber. Check local permit and licensing requirements before starting.

How do I know if a home repair requires a permit?

Permit requirements vary by location and project. Check with your local building or permitting authority before beginning major electrical, plumbing, structural, HVAC, or remodeling work.

Is DIY always cheaper than hiring a contractor?

Not necessarily. DIY can save labor costs when you have the skills and tools to complete a project correctly. A mistake that causes water, electrical, structural, or other damage can make repairs far more expensive than hiring a professional from the start.