7 Hidden Ground-Up Construction Costs Developers Need to Budget For

Ground-up construction could offer experienced developers a level of control over product, spec, and margin that renovation projects may not match, but that control may often come with a wider range of cost variables to underwrite. According to data from NAHB's Cost of Construction Survey, site work for a typical new single-family home came out to $32,719 in 2024. This figure represents nearly a twofold increase from the 2019 average of $18,323, and persistent input cost pressures suggest that these expenses are likely even higher for developments getting underway in 2026. Developers who understand where these variables tend to concentrate are often better positioned to build accurate pro formas and protect their margins from the start.

Key Takeaways

Site work averaged $32,719 per home in 2024, the most recent benchmark available, per NAHB's Cost of Construction Survey, and input cost pressures may push that figure higher for 2026 builds.
Impact fees are typically front-loaded onto new builds and may be due before vertical construction begins, per NAHB's Impact Fee Primer.
Builders estimated an average of $10,900 in tariff-related cost increases per home in 2025, per NAHB's Housing Market Index survey.
A 15-20% contingency reserve is a widely recommended baseline for ground-up construction budgets, per NAHB guidance.

What Ground-Up Developers Know That First-Timers Often Learn Later

Building from the ground up may offer something many renovation projects may not: total control over the layout, the systems, the materials, and the spec level. When the budget is built accurately, that control could translate directly into margin.

The gap between a strong pro forma and a scrambled one often comes down to a specific category of costs. Hard costs, such as lumber, labor, and fixtures, tend to be relatively straightforward to estimate. The costs that may catch developers off guard are typically the ones that live outside the standard construction budget: in pre-construction requirements, utility paperwork, regulatory timelines, and carry. This guide covers seven of them, along with how to account for each before breaking ground.

How Does Site Preparation Affect Your Construction Budget?

Site prep is one of the first line items where construction budgets may diverge from initial estimates. Purchasing the land is one transaction; physically preparing that land to support a residential structure is a separate financial undertaking. NAHB's Cost of Construction Survey put the average site work cost at $32,719 in 2024, the most recent year tracked, and that figure may be running higher for projects breaking ground in 2026 given continued input cost inflation.

Soil stability may be among one of the most significant variables. Sandy or clay-heavy soil may require specialized excavation or imported fill to achieve the compaction a foundation needs. Rocky terrain could require heavy machinery to reach footing depth. Neither condition is reliably visible on a site walk alone.

Environmental conditions may add another layer of pre-construction due diligence. Buried debris, old underground storage tanks, or contaminated fill material are all conditions that may require remediation before construction can begin. Local code typically mandates remediation before a permit is issued, and costs vary widely based on scope and jurisdiction.

Beyond soil and environmental factors, site prep commonly includes:

Temporary perimeter fencing to meet code requirements and secure the site
Erosion control measures to prevent runoff into city drainage systems
Temporary gravel access roads for heavy delivery equipment
Site grading and clearing, which on challenging terrain could run well above standard estimates

Kiavi Tip: Commissioning a geotechnical survey before purchase, rather than after closing, may surface soil conditions early enough to factor them into your offer price rather than your contingency fund.

What Are Impact Fees and How Much Do They Cost?

Impact fees are charges levied by local governments to offset the infrastructure strain a new home may place on public systems: schools, roads, parks, and emergency services. Because new construction adds a household to the local grid, the jurisdiction typically charges the builder for that anticipated burden, often as a condition of permit issuance.

Unlike property taxes, which are distributed across all households in a community, impact fees are generally front-loaded onto the builder of new construction, according to NAHB's impact fee analysis. That upfront obligation may arrive before vertical construction begins, not after the property sells.

NAHB's Cost of Construction Survey reported a national average impact fee of $6,367 for new single-family homes in 2024, the most recent year tracked, and fees in high-growth markets could run meaningfully above that figure. Jurisdictions with infrastructure running near capacity tend to carry higher fees, and those averages may have shifted upward in the time since.

Beyond the impact fee itself, the full permitting and inspection cycle may include:

Building permit fees (averaging $7,640 in 2024, per the NAHB Cost of Construction Survey, with increases likely in many jurisdictions since)
Water and sewer inspection fees (averaging $6,260 in the same 2024 survey)
Architecture and engineering review costs before permit issuance
Inspection fees at multiple construction milestones: footings, framing, rough-in mechanicals, insulation, and final occupancy

Each of these costs varies by jurisdiction, and differences between adjacent markets may be significant. Developers who benchmark permit-related fees against regional averages rather than verified local figures may find their pre-construction budgets short before a shovel enters the ground.

How Much Do Utility Connections Cost for New Construction?

Connecting a new build to water, sewer, gas, and electrical service is a separate cost category from the construction budget itself, and in many cases it involves more complexity than developers initially anticipate. Even when utility mains run along the lot line, physically tapping into them involves fees, permits, labor, and potentially road restoration.

"Tap fees" are charges collected by utility providers to connect a private service line to the public main. Water and sewer tap fees may range from a few thousand dollars to significantly more depending on the municipality and line capacity. If the main runs across the street, the developer may also bear the cost of boring under the road or restoring asphalt after trenching.

For projects with higher electrical demand, including those with EV charging infrastructure, dual HVAC systems, or heated pools, the existing local grid segment may not carry sufficient capacity. In that scenario, the developer may be responsible for a service upgrade, which could involve paying the utility to install a new transformer or upgrade the lines serving the property.

Location shapes both the nature of the utility cost and the dollar amount:

Scenario	Primary Cost Drivers
Urban or suburban infill lot	Tap fees, street repair after trenching, aging infrastructure premiums
Rural lot without city utilities	Well drilling, septic system design and installation, soil percolation testing

Source: Kiavi, July 2026

Rural utility costs could rival urban tap fees in some jurisdictions. A septic system alone typically involves soil testing, engineering, and installation across multiple permitted phases.

Kiavi Tip: Requesting utility connection cost estimates from the local municipality and utility provider before closing on the land, rather than after, may help developers avoid a mid-project budget reset.

How Are Material Costs and Tariffs Affecting New Construction in 2026?

Material cost volatility has become one of the more closely watched budget variables in new construction, and in 2026 that volatility is being driven by tariff policy and commodity pricing.

According to NAHB's tariff impact analysis, builders estimated an average of $10,900 in tariff-related cost increases per home in April 2025. Construction input costs overall have risen more than 40% since 2020. The PPI for inputs to new residential construction was up 6.9% year-over-year as of May 2026, per NAHB's analysis of Bureau of Labor Statistics data, with building materials excluding energy rising at their fastest pace in three years.

Copper is a particularly active exposure category for new construction budgets. The Producer Price Index for copper wire and cable climbed nearly 25% year-over-year as of April 2026, according to multiple sources. Wiring a new home may require copper throughout, from the service entrance to individual outlets, and that exposure could run across multiple trades simultaneously.

Lumber carries its own cost dynamics. Canadian softwood lumber, which accounts for roughly 85% of U.S. softwood lumber imports, now faces combined duties exceeding 45% after 2025 tariff increases, per NAHB. Developers who want to manage this exposure could have a few options worth building into their procurement strategy:

Locking in material pricing as early as the GC timeline allows
Ordering long-lead items before ground-breaking rather than waiting for framing completion
Including escalation clauses in GC contracts that specify how tariff-driven cost increases are handled
Building material cost contingency as a dedicated line item separate from general contingency

What Regulatory and Code Changes Could Affect Your Construction Budget?

Building codes can change, and unlike material price shifts, regulatory changes may become mandatory mid-project. A code update that takes effect while plans are in review or a foundation is being poured could require a scope revision and a budget adjustment.

A 2026 NAHB study found that regulations at the federal, state, and local levels now add an average of $131,734 to the cost of a new single-family home, a more than 40% increase from 2021. The construction phase alone accounts for $84,939 of that figure, driven largely by building permit fee increases and code changes over the past decade.

Energy efficiency requirements have been tightening in many jurisdictions. More municipalities are requiring third-party energy audits, advanced insulation assemblies, and verified air-tightness testing as part of the final occupancy approval process. These tend to be permit conditions rather than optional features, which means they belong in the budget from the start.

HVAC systems represent another area of active code change. The phased transition away from R-410A refrigerant, a common coolant in residential systems, may have created supply constraints on the replacement refrigerant systems now required by code in many jurisdictions. Equipment costs and lead times for compliant systems appear to have increased, and pricing locked in during the planning phase may not hold by the time HVAC rough-in arrives.

Other line items that may emerge as required scope include radon rough-in, stormwater management compliance, and fire suppression sprinkler mandates. Checking with the local building department for any code updates scheduled to take effect during the planned construction window could save a costly scope change mid-build.

What Are Soft Costs in Construction and How Much Should You Budget?

Soft costs are the administrative, professional, and carrying expenses that don't appear in the material or labor estimate but are still essential to project delivery. Treating them as a vague add-on rather than a specific budget category is one of the more reliable ways to face a shortfall late in a project.

The most significant ongoing soft cost is typically interest carry. Every month that construction financing is outstanding, interest may accrue. A two-month permit delay may not just set back the timeline. It could add two months of financing costs to the total project expense. On a larger ground-up build, that carry could represent tens of thousands of dollars.

Other soft cost categories that may be worth budgeting include:

Builder's risk insurance, which covers the structure against theft, fire, or damage during construction and may be required by most lenders
General liability insurance for the active job site
Third-party engineering and plan review fees
Portable restrooms over a 9-12 month build period
Dumpster rental and associated hauling fees
Temporary utility service during construction
Project management and accounting time, if self-managing

Soft costs as a percentage of total project cost typically run 10-15% for new construction, per industry benchmarks. Developers who model them as a specific line item rather than a rough add-on tend to have fewer surprises near the finish line.

Why Are Landscaping and Hardscaping Line Items on New Builds?

Many developers reach the end of finish work with the original budget nearly exhausted, only to find that exterior site work remains before the jurisdiction will issue a Certificate of Occupancy (CO). In many municipalities, the CO may not be issued until specific landscaping and hardscaping conditions are met.

Municipal codes may frequently require minimum sod coverage, a specified number of trees, and grading that manages stormwater runoff. Those requirements function as permit conditions, not optional curb appeal upgrades.

Hardscaping could add additional required scope. Driveways, sidewalks, and retaining walls are often excluded from the primary construction budget because they're classified as exterior site work, but they're typically necessary for a property to be occupancy-ready. In many municipalities, developers are also responsible for restoring any public right-of-way damage caused by delivery and construction equipment, including curbs, sidewalk sections, and grass verges. That restoration obligation may not fall on the GC unless it's written into the contract, and it won't typically be waived to accelerate a CO timeline.

Kiavi Tip: Building landscaping, hardscaping, and right-of-way restoration as specific line items before breaking ground, rather than addressing them as post-construction afterthoughts, may help developers avoid a stalled CO and the extended carry costs that come with it.

How Should Developers Structure Their Budget to Protect Margin?

Understanding where these cost categories tend to surface is the analytical step. Building a budget structure that accounts for them before ground-breaking is the operational one.

Contingency Fund

A contingency reserve of 15-20% of total construction cost is a widely recommended baseline for ground-up construction, per broader industry benchmarks. Given current input cost volatility in 2026, the higher end of that range may be worth modeling. That reserve acts as a dedicated buffer for the soil condition that wasn't visible on a site walk, the tariff-driven cost spike mid-project, or the permit cycle that runs longer than expected. If the full amount isn't used, it becomes additional profit at close.

Line-Item Bidding

When soliciting GC bids, itemized line-item estimates typically reveal more than a per-square-foot all-in figure. A detailed bid could make it possible to evaluate each category against market research and identify gaps before construction begins, rather than discovering them mid-build.

Material Purchasing Strategy

On long-lead items, including electrical components, copper wiring, and structural steel, purchasing early or before ground-breaking may reduce exposure to mid-project cost increases. Locking in pricing when the GC places the order is one way to potentially limit that variable.

Real-Time Budget Tracking

Tracking budget versus actuals continuously, rather than reviewing at monthly milestones, tends to surface cost drift while there's still time to address it through scope adjustments rather than emergency capital calls.

Final Thoughts

Ground-up construction may deliver margins that are difficult to replicate through renovation, and the developers who see those margins consistently tend to be the ones who build accurate, complete budgets before they break ground. The seven categories above, covering site prep, permits and impact fees, utility connections, material and tariff volatility, code compliance, soft costs, and exterior finish requirements, are not edge cases. They're standard features of new construction that should belong in every pro forma from day one. If you're evaluating a ground-up project or looking at how your capital structure interacts with these variables, explore Kiavi's new construction financing options to understand how the financing side of the deal fits into the full budget picture.

Frequently Asked Questions

Frequently Asked Questions (FAQs)

Common questions about ground-up construction budgeting in 2026, covering contingency fund sizing, impact fee variability, how tariffs may be affecting material costs, what soft costs include, and landscaping requirements for a Certificate of Occupancy.

A 15-20% contingency reserve is a widely recommended baseline for ground-up construction, with the higher end of that range worth modeling given current input cost volatility. The contingency fund works best when treated as a dedicated budget line, not a general margin buffer. If the full amount isn't used, it converts to additional profit at project close. For a broader framework on structuring a ground-up build financially, the 2026 ground-up construction strategy guide covers the full project lifecycle.

Impact fees reflect local infrastructure conditions and growth rates. Jurisdictions with high demand on schools, roads, and utilities tend to charge more to offset the strain new development may place on those systems. According to NAHB, impact fees are often front-loaded onto new construction rather than distributed across the broader tax base, meaning the entire fee burden typically lands on the builder or developer at permit issuance. NAHB's Cost of Construction Survey reported a national average of $6,367 in 2024, the most recent year tracked, and fees in high-growth markets could run well above that baseline, with increases likely since that data was collected.

Tariff-related cost pressures on new construction have continued to build since 2025. NAHB's April 2025 Housing Market Index survey found builders estimated an average of $10,900 in additional costs per home from tariff actions. Copper wire and cable prices climbed nearly 25% year-over-year as of April 2026, according to multiple sources. Canadian softwood lumber, accounting for roughly 85% of U.S. imports, may now face combined duties exceeding 45%. Locking in material pricing early and including tariff escalation provisions in GC contracts may help manage this exposure.

In many jurisdictions, yes. Municipal codes frequently require minimum sod coverage, tree planting, graded stormwater drainage, and completed driveway and sidewalk work before a CO is issued. Hardscaping requirements, including responsibility for right-of-way restoration after heavy equipment use, may be a common source of final-phase surprises for developers who did not budget them explicitly upfront.