Property improvements are permanent changes to real estate that add value, extend useful life, or adapt the property to a new purpose. The IRS treats a project as an improvement, rather than a repair, if it does any one of three things: makes a betterment to the property, restores it, or adapts it to a new or different use.1Internal Revenue Service. Tangible Property Final Regulations That classification drives how you deduct the cost, how much tax you owe when you sell, whether you need a permit, and what your insurance should cover.
The Three-Part Test
A betterment is work that materially adds to the property, increases its capacity, or meaningfully boosts its output or efficiency. Installing central air conditioning in a home that never had it is a betterment. A restoration involves replacing a major component or substantial structural part of the property, such as putting on an entirely new roof after the old one fails. Adaptation means converting the property to a use different from what you originally intended, like turning a residential basement into a rental apartment.1Internal Revenue Service. Tangible Property Final Regulations
Work that fits none of those categories is generally a repair. Repairs keep property in its existing condition without adding value: patching a roof leak, fixing a few broken windowpanes, repainting a room. The IRS also offers a de minimis safe harbor. If you don’t have audited financial statements, you can deduct expenditures of $2,500 or less per item without analyzing whether they’re improvements or repairs. With audited financial statements, the threshold is $5,000 per item.1Internal Revenue Service. Tangible Property Final Regulations
What Qualifies and What Doesn’t
IRS Publication 523 lists the projects that count as improvements adding to a home’s basis.2Internal Revenue Service. Publication 523 – Selling Your Home They include:
- Additions such as a new bedroom, bathroom, deck, garage, porch, or patio
- Systems like central air conditioning, heating, duct work, security systems, wiring upgrades, or lawn sprinklers
- Lawn and grounds work including landscaping, a new driveway, fencing, retaining walls, or a swimming pool
- Exterior work such as a new roof, siding, storm windows, or storm doors
- Interior projects like kitchen modernization, new flooring, a fireplace, or built-in appliances
- Plumbing additions including a new septic system, water heater, or water filtration system
- Insulation added to the attic, walls, floors, or duct work
Several costs do not add to your basis: interior or exterior painting, fixing leaks or cracks, replacing broken hardware, or any improvement that is no longer part of the home when you sell it, such as carpeting you installed and later ripped out. Work with a useful life of less than one year at the time of installation also doesn’t count.2Internal Revenue Service. Publication 523 – Selling Your Home
Context matters more than the physical work itself. Replacing a few broken windowpanes is a repair; replacing all the windows as part of a larger renovation becomes an improvement. The IRS looks at whether repair-type work is done as part of an extensive remodeling or restoration job, and if so, the whole project gets treated as a capital improvement.2Internal Revenue Service. Publication 523 – Selling Your Home
How Improvements Raise Your Tax Basis
When you sell your home, the IRS calculates your gain by subtracting your adjusted basis from the sale price (minus selling expenses). Your adjusted basis starts with what you originally paid and increases with the documented cost of capital improvements.3Internal Revenue Service. Property (Basis, Sale of Home, etc.) 3 Publication 551 puts it directly: you increase the basis of property by the cost of any improvements with a useful life of more than one year.4Internal Revenue Service. Publication 551 – Basis of Assets
Say you bought a home for $300,000 and later spent $40,000 on a kitchen renovation. Your adjusted basis becomes $340,000. Sell for $450,000 and your taxable gain is $110,000, not $150,000.
Most homeowners won’t owe tax on that gain anyway. Under Section 121, if you owned and lived in the home as your primary residence for at least two of the five years before the sale, you can exclude up to $250,000 of gain from income, or up to $500,000 for married couples filing jointly who meet the requirements.5Office of the Law Revision Counsel. 26 USC 121 – Exclusion of Gain From Sale of Principal Residence Improvements still matter when the gain exceeds the exclusion, when you don’t qualify for the full exclusion, or when you’re selling a second home or investment property where no exclusion applies.
Keep the paper trail. The IRS advises retaining records of your purchase price and all capital improvements until at least three years after the due date for the tax return reporting the sale.2Internal Revenue Service. Publication 523 – Selling Your Home In practice, hold on to contractor invoices, material receipts, building permits, and before-and-after photos the entire time you own the property. If the IRS questions your basis adjustment, you carry the burden of proof.
Improvements to Rental Property
Improvements to a home you live in sit quietly in your basis until you sell. Improvements to rental property work differently: you must depreciate them. Capital improvements to residential rental property are depreciated over 27.5 years using the straight-line method, the same recovery period as the underlying building.6Office of the Law Revision Counsel. 26 USC 168 – Accelerated Cost Recovery System Each improvement is treated as a separate asset with its own placed-in-service date.7Internal Revenue Service. Depreciation Recapture 4
A $30,000 bathroom renovation in a rental unit deducts in small annual increments (roughly $1,091 per year) rather than all at once. Painting that’s part of a larger capital renovation also gets folded into the improvement and depreciated over the full 27.5-year period.7Internal Revenue Service. Depreciation Recapture 4
Energy Credits Tied to Specific Improvements
Some improvements qualify for federal tax credits that reduce what you owe dollar for dollar. The Residential Clean Energy Credit covers 30% of the cost of installing qualifying clean energy equipment with no annual cap. Eligible equipment includes solar electric panels, solar water heaters, wind turbines, geothermal heat pumps, fuel cells, and battery storage systems.8Internal Revenue Service. Residential Clean Energy Credit A $20,000 solar installation generates a $6,000 credit. The credit is scheduled to phase down beginning in 2033.
The Energy Efficient Home Improvement Credit applies to more conventional efficiency upgrades like heat pumps, insulation, energy-efficient windows, and exterior doors. Annual limits apply: up to $1,200 for most qualifying improvements and up to $2,000 for heat pumps, biomass stoves, and biomass boilers.9Internal Revenue Service. Energy Efficient Home Improvement Credit
Both credits apply only to your primary residence and only to new equipment, not used. Improvements must meet specific energy-efficiency standards, and beginning in 2025, qualifying items must be produced by a certified manufacturer and identified by a Qualified Manufacturer Identification Number reported on your return.9Internal Revenue Service. Energy Efficient Home Improvement Credit
Permits, HOA Approval, and Reassessment
Most improvements that alter a home’s structure, electrical system, plumbing, or mechanical systems require a building permit from your local jurisdiction. Permit fees range from under $100 for minor work to several thousand dollars for large projects. The permit process exists to confirm the work meets code, and skipping it creates real problems later.
Unpermitted improvements can complicate a future sale. Most jurisdictions require sellers to disclose known unpermitted work. Appraisers and buyers discount homes with undocumented improvements. Lenders may refuse to approve a mortgage on a property with unpermitted structural changes, shrinking your pool of potential buyers. A municipality can require you to bring the work up to current code, or in some cases remove it, before issuing a certificate of occupancy.
If you live in a community with a homeowners association, there’s often a second layer of approval. HOA architectural committees review exterior modifications, additions, landscaping changes, and sometimes interior work like flooring replacements in condominiums. HOA approval doesn’t substitute for a building permit, and vice versa. You generally need both.
Expect your property tax bill to rise after a major improvement. Local tax assessors monitor building permit applications, and a permit for a significant project is likely to trigger a reassessment. Reassessment timing varies by jurisdiction: some reassess annually, others less frequently. The new assessed value reflects enhanced market value, not just the cost of the work, so a $50,000 addition might change your assessed value by more or less than $50,000. Cosmetic upgrades that don’t require a permit, like interior painting or replacing countertops, are far less likely to attract attention.
Fixtures, Tenants, Insurance, and Liens
An improvement is the work performed. A fixture is an object that was once personal property but has been attached to real property so permanently that it’s now legally part of the building or land. Courts typically evaluate three factors to decide: whether it’s physically attached, whether it’s adapted to the property’s use, and whether the installer intended it to be permanent. Installing a new furnace is the improvement; the furnace itself becomes a fixture once it’s integrated into the ductwork.
The distinction matters most during a sale. Fixtures are generally expected to convey with the property. If you plan to take a chandelier or built-in wine cooler with you, exclude it from the sale in writing. Disputes over fixtures that weren’t addressed in the contract are a common last-minute problem in closings.
The same logic applies to rentals. Improvements a tenant installs in a rental property generally become the landlord’s property once attached. Unless the lease says otherwise, a tenant who installs new flooring, built-in shelving, or a ceiling fan cannot rip those items out when moving. Removing attached improvements and damaging the property in the process can lead to deductions from the security deposit or additional liability. If you’re a tenant planning a significant improvement, get written permission that spells out who pays for it, who owns it, and what happens when the lease ends.
After completing a major improvement, notify your insurance company. An addition or significant renovation increases replacement cost, and your existing policy limit may no longer cover what it would take to rebuild. If fire or storm destroys the home after a $100,000 renovation and you never updated the policy, you absorb the gap. For large projects, a builder’s risk policy provides more comprehensive coverage during construction than a standard homeowner’s policy, which wasn’t designed for active construction sites.
Every state has some form of mechanic’s lien law. A mechanic’s lien lets anyone who provided labor or materials for the project place a legal claim against your property if they aren’t paid. The risk applies even if you already paid your general contractor in full. If your contractor doesn’t pay a subcontractor or supplier, that unpaid party can file a lien against your home, and you can end up paying twice for the same work.
Protect yourself by requesting lien waivers with each payment. A lien waiver is a signed document in which the contractor or subcontractor acknowledges receiving payment and gives up the right to file a lien for that amount. Conditional waivers take effect once payment clears; unconditional waivers take effect immediately. Getting them signed at each payment milestone feels like paperwork until it saves you from a five-figure surprise.