Solar Feasibility Study Cost: What to Budget in 2026

A desktop solar feasibility screen generally costs several hundred to a few thousand dollars for most homes and small businesses, while a full commercial study with structural, electrical, and interconnection review usually costs a few thousand to mid five figures. Utility-scale feasibility work, which includes geotechnical surveys and grid-impact analysis, can cost tens of thousands or more depending on site complexity.

The right move depends on where you are in the decision. If you’re still asking whether solar makes sense at all, start with a desktop screen using free NREL modeling tools. If your project is large enough to need financing or a lender’s sign-off, budget for a full feasibility study that produces a bankable report.

Before you spend a dollar, take these three steps:

• Run your address through NREL’s PVWatts calculator for a free rough production estimate.
• Pull 12 months of utility bills so any consultant can model your actual load, not a guess.
• Request a desktop screen quote from at least one independent consultant before committing to a full study.

Key Takeaways

Solar feasibility study cost depends primarily on scope tier and site complexity, ranging from a few hundred dollars for a desktop screen to tens of thousands for utility-scale comprehensive studies.

Solar Feasibility Study Cost vs. Interconnection and Design Studies

A feasibility study answers one question: does this solar project make technical and financial sense before you spend real money on engineering? It combines a site assessment with an economic model to produce a go or no-go recommendation, and it’s the document lenders and boards want to see before approving a project.

Confusion creeps in because three related studies get lumped together under “feasibility,” and paying for the wrong one wastes money.

• Desktop/preliminary feasibility uses satellite imagery, utility bills, and public irradiance data to give a directional cost and savings estimate, usually within a few days.
• Full feasibility study adds a physical site visit, structural and electrical screening, shading analysis, and a detailed financial model with IRR and payback.
• Interconnection study is a separate, utility-run process that evaluates whether your local grid infrastructure can handle the proposed system. It happens after feasibility and often costs extra fees paid directly to the utility, governed in part by FERC’s interconnection final rule.
• Detailed engineering design comes last, converting an approved feasible project into stamped construction drawings.

Here’s how the deliverables map to what you actually need:

• Applying for a construction loan or PPA financing → full feasibility study with a formal report
• Getting a building permit → detailed engineering design, not a feasibility study
• Deciding whether to move forward at all → desktop screen is usually sufficient
• Connecting a commercial or utility system to the grid → interconnection study, run through the utility

Choosing the Right Feasibility Study Level

Most consultants offer three tiers, and picking the wrong one either wastes money on unnecessary detail or leaves you without the documentation a lender requires. Match the tier to what you’re actually trying to decide.

Desktop/preliminary feasibility relies on aerial imagery, historical utility data, and tools like PVWatts to produce a rough savings and cost estimate. It fits homeowners and small business owners doing initial due diligence, and it typically skips a physical site visit entirely. Turnaround is fast, and cost stays low because there’s no field labor involved.

Standard/commercial feasibility is the workhorse tier for most businesses considering rooftop or ground-mount systems above 50 kW. It includes an on-site visit, structural and electrical screening, shading analysis, and a full financial model built in NREL’s System Advisor Model (SAM). This is the level most lenders expect before approving commercial solar financing.

Utility-scale/comprehensive feasibility covers multi-megawatt ground-mount or solar farm projects and folds in geotechnical borings, environmental review, transmission-line studies, and often a formal interconnection queue analysis. Add-ons at this tier commonly include battery storage modeling, land-use permitting review under guidance like SEIA’s land-use resources, and LCOE benchmarking against installed-cost data.

One caveat worth knowing: many solar sales teams offer a “free feasibility check” as part of their pitch. That’s fine for a first look, but it’s built to justify a sale, not to give you an independent go/no-go. If the project size or dollar amount is large enough to matter, an independent paid study is worth the money precisely because it isn’t trying to close a deal.

How Much Does a Solar Feasibility Study Cost by Project Size?

Cost scales with three things: physical site visits, engineering complexity, and how many specialists need to sign off on the report. Here’s what that looks like across project sizes.

These ranges assume a single site with reasonable access. Multi-site portfolios, remote land parcels, or projects requiring wetlands or endangered-species review under EPA re-powering guidance push costs toward the top of the range or beyond it.

A sample itemized breakdown for a mid-size commercial study (roughly $6,000 total) looks something like this:

• Site visit and drone/roof survey: $800 to $1,200
• Structural and electrical assessment: $700 to $1,000
• Energy production modeling (PVWatts/SAM): $500 to $900
• Financial model and incentive analysis: $900 to $1,400
• Interconnection pre-screening: $400 to $700
• Report compilation and professional engineer stamp: $700 to $1,200
• Project management and client review calls: $300 to $500

Consultants price this work three ways. A flat fee is most common for standard commercial studies where scope is well-defined upfront. A percentage of estimated CAPEX, usually 0.5% to 2%, shows up more often on utility-scale work where the project size isn’t fixed until the study itself narrows it down. Time-and-materials billing applies when scope is genuinely uncertain, such as a site with unknown structural conditions or a complicated multi-parcel interconnection.

What Drives the Price Up or Down

Project size is the obvious lever, but it’s rarely the biggest one. Site complexity and the number of required specialist reports usually matter more.

• Roof or terrain complexity: multiple roof planes, unusual shading from trees or adjacent buildings, or steep or uneven ground all add hours to the site visit and modeling.
• Structural uncertainty: older buildings or unknown roof framing often trigger a separate structural engineer’s report, adding $1,000 to $3,000.
• Geotechnical needs: ground-mount systems on unproven soil require borings and a geotech report, a common utility-scale line item running several thousand dollars on its own.
• Multiple interconnection points: campuses or multi-building commercial sites with more than one utility meter multiply the electrical review work.
• Environmental or land-use review: wetlands, floodplains, or protected species screening can add weeks and thousands of dollars.
• Battery storage integration: adding storage modeling to a feasibility study typically adds 15% to 25% to the base cost because it requires separate load and dispatch modeling.

These drivers compound. A utility-scale project that needs geotechnical work, environmental review, and a formal transmission study simultaneously can see its feasibility budget triple compared to a straightforward greenfield site with clean soil and a nearby substation.

Pro Tip: Before you commission a full study, ask the consultant for a 15-minute “screening call” using your utility bills and satellite imagery. A quick look at your roof orientation, shading, and available interconnection capacity often reveals a red flag, like a shaded roof or a maxed-out local transformer, that would have driven your full study cost up for nothing.

Reading a Solar Feasibility Report

A well-built report follows a predictable structure, and knowing what belongs where helps you spot a thin or padded deliverable before you pay for it. A solid checklist looks like this:

• Executive summary with a clear go/no-go recommendation
• Site maps, roof or ground layout, and shading analysis
• Structural and electrical screening results
• Annual production estimate, typically modeled in PVWatts or SAM
• Itemized CAPEX and projected OPEX
• Available incentives, including the federal solar investment tax credit and state-level programs listed on DSIRE
• Financial metrics: payback period, LCOE, and IRR
• Interconnection notes and anticipated utility requirements
• Recommended next steps and remaining open risks

When you get the report, check the production table’s assumptions first. A credible estimate cites its irradiance source, ideally NREL’s NSRDB, and states its system loss assumptions (shading, soiling, inverter efficiency) rather than defaulting to generic percentages. On the financial side, verify the discount rate used for IRR calculations and confirm incentive figures reflect current program rules rather than a stale rate carried over from a template. A report that skips its own assumptions is one of the clearest signs of a rushed or templated deliverable.

How Long a Feasibility Study Takes

Turnaround tracks scope almost exactly. A desktop screen can come back in two to five business days since it relies entirely on remote data and public tools. A standard commercial feasibility study takes one to three weeks, driven mostly by scheduling the site visit and compiling the financial model. Utility-scale comprehensive studies run anywhere from six weeks to several months once geotechnical work, environmental review, and interconnection pre-screening enter the mix.

The typical engagement moves through six steps:

1. Initial data collection (utility bills, site address, building plans)
2. Site visit or remote survey, depending on scope tier
3. Energy and financial modeling
4. Draft report delivery
5. Client review and question period
6. Final report and recommendation

Delays usually trace back to a handful of causes: slow utility data requests, wet-season access problems on ground-mount sites, additional surveys requested mid-project after an unexpected structural finding, or a long queue at the utility for interconnection pre-screening. Building two extra weeks of buffer into your timeline for any commercial or utility-scale project is a reasonable habit.

Questions to Ask Before Hiring a Feasibility Consultant

The consultant you hire matters as much as the study tier you choose. Ask these questions before signing anything:

• How many years of feasibility work in this market, and can you share an anonymized sample report?
• What tools do you use for production and financial modeling, specifically PVWatts, SAM, or NSRDB data?
• What’s your typical turnaround for this project size, and what could extend it?
• What assumptions are baked into your production estimate, and where do they come from?
• What’s explicitly excluded from this scope, and what triggers an additional fee?
• Can you provide references from a similar project size?

Watch the pricing clauses closely. Scope creep is the most common budget-buster in feasibility work, so get a written definition of what counts as “additional site visits” or “rework” before you sign. Ask whether you own the final report outright or whether it’s licensed only for use with that consultant’s recommended contractors, since that distinction matters if you shop the project to multiple installers afterward.

A few red flags should end the conversation immediately: production estimates that ignore local shading or historical irradiance data, no willingness to share a sample report, no proposed site visit for a project over 50 kW, or a refusal to name the modeling tools or data sources behind their numbers.

How the Cost Estimates in This Guide Were Built

The ranges above come from a bottom-up, task-based approach: pricing each line item, site visit hours, structural review, modeling time, report writing, separately and summing them, rather than quoting a single vague number. That’s the same method most credible consultants use, and it’s why a good proposal itemizes cost instead of handing you a flat quote with no breakdown.

Three public tools anchor the modeling side of any credible study:

• PVWatts provides the fast, free production estimate used in desktop screening and as a sanity check on more detailed models.
• SAM (System Advisor Model) handles the detailed financial and performance modeling required for bankable, lender-ready reports.
• NSRDB supplies the historical irradiance data that calibrates both tools to your actual site rather than a regional average.

A worked example: a 100 kW small commercial rooftop system might see site visit and survey costs around $900, structural and electrical review near $800, PVWatts/SAM modeling at $600, financial modeling and incentive analysis at $1,100, and report compilation with an engineer’s stamp near $900, for a total feasibility cost near $4,300. Installed-cost benchmark data from NLR helps validate that the resulting CAPEX assumptions in that report are realistic for the region.

Why the Cheapest Study Is Rarely the Best Deal

An anonymized case from the commercial side of this business sticks with me: a facility manager nearly moved forward on a 250 kW rooftop system based on an installer’s free assessment, which assumed a roof structure that couldn’t actually support the array without $40,000 in reinforcement. A paid feasibility study caught the structural gap before the equipment order went in, not after.

Clients consistently underestimate two things: how much shading from a neighboring structure can cut annual production, and how much a skipped structural report can cost later if the roof can’t actually hold the array. A paid study that costs a few thousand dollars almost always pays for itself the moment it prevents a five or six-figure mistake discovered mid-construction.

Getting a Feasibility Study Done Right in Florida

Solar Energy Management has spent more than 20 years providing independent solar consulting to homeowners and businesses across Florida, a market where solar adoption has historically lagged and where hurricane-rated structural review matters more than in most states. Because the firm doesn’t sell or install panels, its feasibility studies aren’t shaped by a sales quota.

Services relevant to the cost ranges covered in this guide include:

• Desktop screening for homeowners and small businesses weighing an initial decision
• Full commercial feasibility studies with structural, electrical, and financial modeling
• Battery storage and microgrid feasibility analysis
• Incentive and financing guidance, including the commercial 30% investment tax credit
• Permitting and interconnection support for Florida utilities

If your project is large enough that a wrong assumption could cost real money, a scoped quote is worth the conversation. Visit the energy solutions page to request a desktop screen or a full feasibility proposal tailored to your building and budget.

Sources

The cost ranges and modeling guidance in this article draw on public tools and government resources that any reader can check directly.

• NLR: Solar installed system cost and market research analysis

This article is general information, not a substitute for advice from a qualified financial advisor. Consult a qualified financial professional about your own circumstances before acting on anything here.

FAQ

How Much Should a Feasibility Study Cost?

A desktop screen generally costs several hundred to a few thousand dollars, while a full commercial feasibility study costs a few thousand to mid five figures, and utility-scale comprehensive studies can exceed tens of thousands depending on site complexity.

What Is the 20% Rule for Solar?

There’s no single universally recognized “20% rule” in solar feasibility work; the phrase is used inconsistently across sources, sometimes referring to a rough rule-of-thumb production offset target or an oversizing margin, so treat any specific version of it with caution unless your consultant defines the assumption explicitly in your report.

How Much Money Can a 100-Acre Solar Farm Make?

Utility-scale revenue depends heavily on power purchase agreement rates, local interconnection capacity, and financing structure, which is exactly why a comprehensive feasibility study, not a rule of thumb, is required to model realistic returns for a project that size.

Why Is It Difficult to Sell a House With Solar Panels?

Homes with leased solar systems or outstanding loan balances can complicate a sale because buyers must either qualify to assume the lease or the seller must pay off the system, while owned systems backed by a documented feasibility study and clear production history tend to sell more smoothly.

Does Solar Energy Management Offer Feasibility Studies?

Yes, Solar Energy Management provides independent desktop screening and full commercial feasibility studies for Florida homeowners and businesses, including financial modeling, structural review, and battery storage feasibility analysis.

Recommended

• Solar Feasibility Study Explained: Your 2026 Guide – Commercial + Residential Solar Power Florida
• Solar Energy Financial Modeling for Business: 2026 Guide – Commercial + Residential Solar Power Florida
• Switch to Solar Energy at Home: A 2026 Homeowner Guide – Commercial + Residential Solar Power Florida
• A Guide to the Solar Power Feasibility Study in Florida – Commercial + Residential Solar Power Florida