Improved land is any parcel that has been permanently altered from its natural state through human additions such as utility connections, grading, drainage, roads, or structures. The change does not require a building. Once permanent infrastructure exists on the parcel, the land is treated as improved for tax, financing, and regulatory purposes, and federal regulations classify these inherently permanent structures and their components as real property.1eCFR. 26 CFR 1.856-10 – Definition of Real Property
Where the Line Falls Between Raw and Improved
Raw land sits in its natural condition: no utility access, no graded surface, sometimes no road reaching it. The moment someone clears vegetation and grades the surface, installs a drainage system, or extends a water line to the property boundary, the parcel has been improved.
A structure is not required. A vacant lot with sewer connections, an electrical hookup, and a paved access road qualifies as improved even with nothing built on it. Agricultural land that has been leveled and irrigated for farming qualifies for the same reason. The test is whether permanent work has been done that changes the land from its original state.
Federal regulations name specific permanently affixed assets that count: parking facilities, fences, bridges, tunnels, roadbeds, pipelines, transmission lines, storage structures like silos and tanks, and stationary wharves and docks.1eCFR. 26 CFR 1.856-10 – Definition of Real Property Each serves a passive function such as containing, supporting, sheltering, covering, or providing a route, and each is expected to stay in place indefinitely.
Common Types of Improvements
Improvements generally fall into three groups, and which type you have affects tax treatment, permitting, and resale.
Utility Infrastructure
Connecting a parcel to water, electricity, natural gas, and sewer is often the first step in making raw land usable. Where municipal sewer is unavailable, a septic system fills the same role. Extending utility service lines to the property increases the land’s basis for tax purposes.2Internal Revenue Service. Publication 551 (12/2025), Basis of Assets In rural areas, a water well is a common improvement, generally running from roughly $1,800 to $24,500 depending on depth and geology. Most jurisdictions require a percolation test before septic installation to confirm the soil can absorb wastewater, typically costing $300 to $3,000.
Site Preparation and Access
Grading to create a level building surface, installing drainage to prevent water pooling, and clearing vegetation all count as improvements. So do paving roads, constructing driveways, and laying sidewalks. The IRS specifically lists paving a driveway, adding water connections, building sidewalks, and constructing roads as items that increase property basis.2Internal Revenue Service. Publication 551 (12/2025), Basis of Assets A professional land survey to mark boundaries before construction typically costs $200 to $25,000, depending on parcel size and terrain.
Structures
Buildings are the obvious form, but the category runs wider. Fences, retaining walls, parking lots, in-ground swimming pools, storage tanks, bridges, and permanent landscaping all qualify. When the parcel sells, these fixtures transfer with the title unless the sale agreement excludes them.
How Improvements Change Your Property Tax Bill
Most local assessors value land and improvements separately, then add the two figures to reach total assessed value. Raw land carries only its base land value. Add utility connections, grading, or a structure, and the assessed value climbs. Annual property tax rises with it.
Any project that requires a building permit will typically trigger a reassessment. The assessor values the new work at market and folds it into your existing assessment. Even modest projects like paving a driveway, installing a fence, or adding a drainage system can raise the assessment enough to noticeably increase your bill. Site preparation catches people out for this reason: they assume no building means no tax hit.
Some local governments create special assessment districts to fund shared infrastructure such as sewer extensions, road paving, or drainage systems that benefit a defined group of parcels. If your land falls inside one of these districts, you may owe an additional tax earmarked for that project, usually running for a set number of years until the project is paid off. The IRS treats assessments for local improvements like paving and water connections as additions to your property’s basis rather than deductible taxes.2Internal Revenue Service. Publication 551 (12/2025), Basis of Assets
Depreciation and Cost Basis
The split between land and improvements matters most for anyone using the property in a business or as an investment. Land itself is never depreciable because it does not wear out. Improvements are.
The 15-Year Recovery Period
Under the Modified Accelerated Cost Recovery System, land improvements such as shrubbery, fences, roads, sidewalks, and bridges are classified as 15-year property.3Internal Revenue Service. Publication 946 (2025), How To Depreciate Property A business owner who spends $150,000 paving a parking lot can recover that cost through depreciation deductions spread across 15 years. The statute also classifies qualified improvement property placed in service after 2017 as 15-year property.4Office of the Law Revision Counsel. 26 U.S. Code 168 – Accelerated Cost Recovery System Land improvements used in a business may also qualify for bonus depreciation, which can pull the deduction into fewer years. The applicable percentage depends on when the property is placed in service and current tax legislation, so check IRS Publication 946 for the figure that applies to your year.
Basis at Sale
Every dollar spent on permanent improvements adds to the property’s cost basis. When you sell, your taxable gain equals the sale price minus your adjusted basis. A higher basis means a smaller gain and less capital gains tax. The IRS defines improvements as additions that increase value, prolong useful life, or adapt property to new uses, and specifically lists landscaping, driveways, walkways, fences, retaining walls, and central air conditioning as improvements that increase basis.5Internal Revenue Service. Publication 523 (2025), Selling Your Home
Keep a separate record for each improvement to business property. The IRS requires you to depreciate each one under the rules that apply to the underlying property as if it were placed in service when the improvement was made.2Internal Revenue Service. Publication 551 (12/2025), Basis of Assets Without documentation of improvement costs at sale time, you cannot prove the higher basis.
Permits That Come With the Territory
Classifying land as improved often means someone had to get permits to make the changes, and future improvements will need their own. Three areas come up most.
Wetlands
Section 404 of the Clean Water Act requires a permit before you can discharge dredged or fill material into waters of the United States, including wetlands. This covers filling land for construction, building levees, constructing roads, and mining projects.6U.S. Environmental Protection Agency. Permit Program under CWA Section 404 The U.S. Army Corps of Engineers handles the permitting; the EPA sets the environmental criteria.
Endangered Species
If your improvement project could affect habitat for listed species, you may need an Incidental Take Permit under the Endangered Species Act. Non-federal entities conducting otherwise lawful activities must apply when the work is reasonably certain to cause incidental harm, and the application requires a Conservation Plan describing how impacts will be minimized and mitigated.7NOAA Fisheries. Permits for the Incidental Taking of Endangered and Threatened Species A project designed to fully avoid affecting listed species does not need the permit, but that determination requires a genuine ecological assessment.
Zoning and Building Codes
Local zoning dictates how a parcel can be used by separating residential, commercial, industrial, and agricultural zones. Building a commercial structure on residentially zoned land requires a variance or rezoning, which can take months with no guarantee of approval. All construction must also meet building codes covering structural integrity, electrical systems, plumbing, and fire safety, and you demonstrate compliance by pulling a building permit before work starts. Permit fees range from a few hundred dollars for minor work to several thousand for large projects.
Financing Improved Land Versus Raw Land
Lenders treat improved land as significantly less risky than raw land, and the terms show it. Raw land loans typically require down payments of 20% to 50% and carry higher interest rates, because the lender is betting on a parcel with no infrastructure and uncertain development potential. Improved lots with existing utility connections, road access, and grading command better terms, with lower down payments and rates closer to conventional mortgage territory.
Planning to buy raw land and improve it yourself usually means financing in stages. Most lenders will not roll speculative site work into a standard mortgage. You may need a land loan for the purchase, a separate construction loan for improvements, and eventually a permanent mortgage once a habitable structure exists. Each stage has its own underwriting, appraisal, and closing costs. Budgeting only for the purchase price is one of the more common mistakes in land development.
A Note on Opportunity Zone “Substantial Improvement”
The general meaning of “improved land” is not the same as the “substantial improvement” test under the Qualified Opportunity Zone rules. If you are investing through a Qualified Opportunity Fund, Section 1400Z-2 treats property as substantially improved only if additions to basis during any 30-month period after acquisition exceed the property’s adjusted basis at the start of that period.8Office of the Law Revision Counsel. 26 U.S. Code 1400Z-2 – Special Rules for Capital Gains Invested in Opportunity Zones In practice, you need to spend at least as much on improvements as you paid for the existing structures, and the cost of the land is excluded from the calculation. Routine maintenance and minor repairs do not count toward the required basis additions. If you are not investing through a QOF, this specialized test does not apply to you; the general definition at the top of this article does.