Service calls are expensive. A plumber showing up to fix a running toilet charges $150-300 for a repair that takes twenty minutes and involves a $10 part. An electrician to replace a light switch. An HVAC technician to change a filter. A handyman to patch a small hole in drywall.
Not all of these require a professional. Many of the most common home repairs are genuinely beginner-friendly — they just look intimidating until you actually try them. The skills involved are learnable, the tools required are basic, and the saving compared to calling someone is significant every single time.
This guide covers the most common DIY home repairs that save real money, along with honest guidance on skill level and when to actually call a professional. Because knowing your limits is as important as knowing how to swing a hammer.
This fits alongside our how to save money on home insurance and how to cut your monthly bills guides — all part of the same goal of reducing what your home costs you every month.
Before You Start: The DIY Mindset
Two things worth establishing before getting into specific repairs:
YouTube is your best friend. For almost every repair in this guide, there are dozens of clear, step-by-step video tutorials available for free. Search the specific repair plus your fixture or appliance model number and you’ll almost always find someone who has done exactly what you need to do. Watch it twice before starting.
Know when to stop. DIY saves money when you do the job correctly. It costs more when a botched repair requires a professional to fix both the original problem and your attempt. The repairs in this guide are genuinely beginner-friendly — but if at any point you’re in over your head, stop and call someone. There’s no shame in it.
Plumbing Repairs
Fix a Running Toilet
Service call cost: $150 – $300 DIY cost: $5 – $20 Skill level: Beginner
A toilet that runs continuously is one of the most common — and wasteful — household problems. It can add $50-200 to your water bill every month if left unfixed.
The cause is almost always one of three things: a worn flapper, a faulty fill valve, or an incorrect water level. All three are DIY-fixable with parts from any hardware store.
How to diagnose it: Lift the tank lid and watch what happens when you flush. If water keeps running into the bowl after the tank refills, the flapper is the likely culprit. If water is running into the overflow tube (the tall tube in the center of the tank), the water level is too high. If the tank never fully fills and the fill valve keeps running, the fill valve needs replacing.
How to fix a worn flapper: Turn off the water supply valve behind the toilet. Flush to empty the tank. Unhook the old flapper from the two ears on the overflow tube and disconnect the chain from the flush handle arm. Take the old flapper to a hardware store and buy an identical replacement. Hook it on, reconnect the chain, turn the water back on, test. Done.
THRIFTY HABIT #57 Add a few drops of food coloring to your toilet tank and wait 15 minutes without flushing. If color appears in the bowl, your flapper is leaking — even if you can’t hear it. Silent toilet leaks waste thousands of gallons of water a year and are just as fixable as noisy ones.
Unclog a Drain
Service call cost: $100 – $250 DIY cost: $0 – $15 Skill level: Beginner
Most slow or clogged drains are caused by hair and soap buildup in bathroom drains or grease and food particles in kitchen drains. Before calling anyone, try these in order:
Bathroom drains: A $3 plastic drain snake (also called a Zip-It tool) pulls hair clogs out of bathroom drains in under five minutes. It’s unpleasant but effective and solves the majority of bathroom drain clogs immediately.
Kitchen drains: Boiling water poured slowly down the drain dissolves minor grease clogs. For more stubborn blockages, baking soda followed by white vinegar followed by hot water is often effective without damaging pipes the way chemical drain cleaners can.
The plunger: Works on both kitchen and bathroom drains. Use a cup plunger (flat bottom) for sinks and tubs, a flange plunger (with the rubber extension) for toilets.
Only call a plumber if these methods fail — which usually indicates a deeper blockage in the main line rather than a simple fixture clog.
Fix a Dripping Faucet
Service call cost: $150 – $300 DIY cost: $10 – $30 Skill level: Beginner to Intermediate
A faucet dripping once per second wastes over 3,000 gallons of water per year. It’s also a straightforward fix in most cases.
The repair depends on the faucet type — ball faucets, cartridge faucets, and compression faucets all have different internal mechanisms — but the process is similar: turn off the water supply under the sink, disassemble the handle, identify and replace the worn component (usually an O-ring, washer, or cartridge), reassemble.
The specific steps vary enough by faucet type that a YouTube search for your exact faucet model is the best guide. Most hardware stores sell repair kits for common faucet brands that include everything you need.
Replace a Toilet Flapper or Fill Valve
Service call cost: $150 – $250 DIY cost: $10 – $20 Skill level: Beginner
Covered partly under the running toilet section above — but worth noting separately that replacing an entire fill valve (not just the flapper) is equally beginner-friendly and takes about 20 minutes.
A complete fill valve kit from a hardware store costs $10-15 and comes with clear instructions. The process: turn off water, flush to empty tank, disconnect the supply line, unscrew the old fill valve, install the new one, reconnect supply line, turn water back on, adjust the water level per the instructions.
Electrical Repairs
Note: Basic electrical repairs like the ones below are safe DIY territory. Anything involving your main electrical panel, rewiring, or adding new circuits should be done by a licensed electrician.
Replace a Light Switch or Outlet
Service call cost: $100 – $200 DIY cost: $5 – $15 Skill level: Beginner
Replacing a standard light switch or electrical outlet is one of the most beginner-friendly electrical repairs — and one that people pay electricians to do constantly when it’s genuinely unnecessary.
The critical first step: Turn off the circuit breaker for the room you’re working in. Use a non-contact voltage tester ($15 at any hardware store) to confirm the power is actually off before touching any wires. This is non-negotiable.
The process: Remove the cover plate, unscrew the switch or outlet from the electrical box, take a photo of how the wires are connected before disconnecting anything, connect the wires to the new switch or outlet in the same configuration, screw it back into the box, replace the cover plate, restore power, test.
The photo step is important — it means you don’t have to memorize or guess the wiring configuration.
THRIFTY HABIT #58 A non-contact voltage tester is a $15 tool that every household should own. It confirms whether power is flowing through a wire without touching it — essential for any electrical work and useful for diagnosing electrical problems throughout your home. Buy one before you need it.
Replace a Light Fixture
Service call cost: $100 – $200 DIY cost: $20 – $100 (cost of new fixture) Skill level: Beginner
Swapping out a ceiling light fixture — replacing an old one with a new one — is a beginner electrical job that follows the same basic process as replacing a switch: turn off the breaker, verify power is off, disconnect the old fixture, connect the new one following the included instructions, secure it to the ceiling box, restore power.
Most new fixtures come with clear wiring instructions. The wiring itself is usually simple: black to black (or labeled wire), white to white, green or bare copper to the ground.
Install a Smart Thermostat
Service call cost: $100 – $150 (installation only) DIY cost: $0 (if you buy the thermostat separately) Skill level: Beginner
Smart thermostat manufacturers like Nest and Ecobee design their products specifically for DIY installation — the apps walk you through every step, including labeling your existing wires before disconnecting them so you know exactly where each one goes on the new thermostat.
Most installations take 30-45 minutes. The saving on the installation fee alone pays for a significant portion of the thermostat’s cost — and as we covered in our save money on your electric bill guide, the ongoing energy savings more than cover the rest.
Walls, Floors, and General Repairs
Patch Small Holes in Drywall
Service call cost: $100 – $200 DIY cost: $5 – $20 Skill level: Beginner
Small holes from nails, anchors, or minor damage are some of the most common and most easily fixed home repairs — and among the most frequently paid to professionals unnecessarily.
For holes under ½ inch: Spackle or lightweight joint compound, applied with a putty knife, allowed to dry, sanded smooth, painted. Done in an afternoon for the cost of a small tub of spackle.
For holes up to 4 inches: A drywall patch kit (available at any hardware store for $10-15) provides a self-adhesive mesh patch that covers the hole. Apply joint compound over and around the patch in thin coats, let each coat dry completely before applying the next, sand smooth, paint to match.
The painting to match is often the hardest part — bring a paint chip from your wall to the hardware store to get a match mixed.
Fix a Squeaky Floor
Service call cost: $100 – $250 DIY cost: $0 – $10 Skill level: Beginner
Squeaky floors are caused by wood rubbing against wood — usually subfloor against joists — as the wood expands, contracts, and moves with seasonal changes and normal use.
From above (no basement access): Sprinkle talcum powder or powdered graphite into the seam where the squeak occurs and work it in with a cloth. This lubricates the wood and often eliminates the squeak immediately. For more persistent squeaks, drive screws through the subfloor into the joist (locating the joist with a stud finder first) to secure the movement.
From below (with basement or crawl space access): Have someone walk on the squeaky area while you identify which joist is moving. Apply construction adhesive between the subfloor and joist where the movement is occurring.
Re-Caulk a Tub or Shower
Service call cost: $100 – $200 DIY cost: $10 – $20 Skill level: Beginner
Old, cracked, or moldy caulk around a tub or shower is both an aesthetic problem and a water damage risk — water that gets behind caulk reaches the wall, causing mold and structural damage over time.
Re-caulking is a beginner job that takes a few hours (mostly waiting for old caulk to soften and new caulk to cure):
- Remove old caulk with a caulk remover tool or utility knife
- Clean the surface thoroughly and let it dry completely — at least 24 hours
- Apply painter’s tape along both edges of the joint for clean lines
- Apply new silicone or latex caulk in a smooth, continuous bead
- Smooth with a wet finger or caulk tool
- Remove tape immediately while caulk is wet
- Allow to cure per manufacturer instructions (usually 24 hours) before using the shower
Fix a Sticking Door
Service call cost: $100 – $150 DIY cost: $0 – $10 Skill level: Beginner
Doors stick for two main reasons: hinges have come loose, or the wood has swollen with humidity.
Loose hinges: Tighten all hinge screws first. If screws spin without tightening (the hole is stripped), remove the screw, fill the hole with wood glue and toothpicks, let dry, reinsert the screw. Works reliably.
Swollen wood: Use a pencil to mark exactly where the door is sticking (rub a pencil along the edge and close the door — the pencil marks where it’s binding). Sand or plane that area slightly, test, repeat until the door swings freely. Paint or seal the sanded area to prevent moisture absorption.
THRIFTY HABIT #59 Keep a basic home repair toolkit assembled and accessible — a hammer, screwdrivers (flathead and Phillips in multiple sizes), a utility knife, a level, a tape measure, pliers, and a stud finder. Having these on hand means repairs happen immediately rather than being deferred because you’d have to go buy tools. The whole set costs $30-50 and pays for itself the first time you avoid a service call.
HVAC Maintenance
Change Your Air Filter
Service call cost: Some HVAC companies charge for filter changes during maintenance visits DIY cost: $5 – $20 Skill level: Complete beginner
This barely qualifies as a repair — it’s pure maintenance — but it’s included because it’s one of the most impactful things you can do for your HVAC system’s efficiency and longevity, and it’s often overlooked.
A clogged filter makes your system work harder, uses more electricity, and shortens the system’s lifespan. Check monthly, replace every 1-3 months. Buy filters in multi-packs to reduce cost per filter.
Clean Your Dryer Vent
Service call cost: $100 – $175 DIY cost: $20 – $30 (dryer vent cleaning kit) Skill level: Beginner
A clogged dryer vent is a genuine fire hazard — lint buildup in the vent duct is one of the leading causes of home fires — and also makes your dryer work harder and take longer to dry clothes, increasing energy costs.
A dryer vent cleaning kit (a flexible brush that attaches to a drill) costs $20-30 and cleans the duct from inside the machine. Disconnect the vent hose from the back of the dryer, run the brush kit through the duct, reconnect. Do this once a year or more if you notice clothes taking longer to dry.
When to Actually Call a Professional
DIY saves money when you do it correctly. It costs more when you don’t. Here are situations where calling a professional is the right financial decision:
Call a professional for:
- Anything involving your main electrical panel or circuit breakers
- Gas line repairs of any kind — this is a safety issue, not just a skill one
- Structural issues: cracks in foundations, load-bearing wall modifications
- Major plumbing work: replacing pipes, water heater installation (in most areas requires permits)
- Roof repairs beyond replacing a few shingles — the fall risk and complexity aren’t worth it for most people
- Any repair where you’ve started and realized you’re in over your head
The goal of DIY isn’t to do everything yourself. It’s to handle the genuinely beginner-friendly repairs that don’t require professional skills — and to recognize the difference between those and the ones that do.
The Financial Impact Over Time
Let’s look at what handling just five common repairs yourself saves over a few years:
| Repair | Pro Cost | DIY Cost | Saving |
|---|---|---|---|
| Running toilet | $200 | $15 | $185 |
| Clogged drain | $175 | $5 | $170 |
| Drywall patch (x2) | $300 | $20 | $280 |
| Re-caulk shower | $150 | $15 | $135 |
| Replace outlet (x2) | $300 | $20 | $280 |
| Total | $1,125 | $75 | $1,050 |
Over a few years of homeownership or renting, handling common repairs yourself saves amounts that add up to real money — and each repair you do builds skills that make the next one faster and easier.
Combined with the home-related savings from our save money on utilities and save money on home insurance guides, taking an active approach to home maintenance and repair is one of the most financially impactful things you can do as a homeowner or long-term renter.
What’s the most money you’ve saved doing a repair yourself instead of calling someone? Drop it in the comments — I’d love to hear the wins!
