In This Guide
Separate the six cost components
A flight-only price and a completed inspection-report price answer different
questions. Ask the supplier to identify what the total includes, even if it
sells a fixed-price package rather than itemized hours.
The following is a budgeting checklist, not a claim that every provider bills
each item separately.
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For a purchased service, ask how equipment use is included in the quote. For an
in-house program, acquisition and ongoing ownership costs belong in your own
budget. Keep those two calculations separate.
Also avoid double counting. If the crew rate already includes equipment and
travel, do not add those costs again when comparing it with an itemized bidder.
Calculate a budget from the work required
Use this structure:
Initial project total = equipment allocation + field labor +
processing/reporting + mobilization + project administration + separately scoped
specialist work.
The examples below assume one building, one successful visit, accessible launch
space and no separately commissioned roof access or destructive investigation.
All rates, hours and allowances are editorial assumptions chosen to show the
arithmetic as of September 5, 2026. Replace them with the bidder's actual
figures. Taxes are excluded.
Worked visual and thermal scenarios
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The thermal column assumes more equipment expense, field time and
interpretation. It does not establish a standard thermal surcharge. Neither
column includes moisture-confirmation testing, roof repairs, a professional
engineering opinion, a measurement-accuracy commitment, recurring hosting or a
return visit.
The administration allowance is an assumed service cost, not an FAA fee.
Likewise, these hourly inputs represent assumed charge-out rates, not wage data.
Use the same calculation to test a change in scope. In the visual example, two
additional reporting hours add $150, taking the total to $800. An extra visit
needs its own labor and travel allowance. This shows why reporting detail and
revisit terms deserve as much attention as flight duration.
A square-foot rate is useful only after scope is aligned. For a hypothetical
20,000-square-foot roof, $1,500 ÷ 20,000 = $0.075 per square foot, or 7.5
cents. That is merely the thermal scenario expressed another way. It is not a
rate to extrapolate to a small house or a much larger facility: the same travel
and setup assumptions will not scale proportionally with area.
Match the deliverables to the roof decision
Visual documentation: what can be seen
For a record of visible conditions, request roof overviews, relevant detail
photographs, a location reference for each observation and a list of areas that
could not be captured. Ask for original-resolution files as well as a readable
report. Specify features that matter to the assignment, such as drains,
penetrations, flashing and previously repaired areas.
Choose this scope when someone needs to review visible conditions or compare
documented areas over time. If the decision requires hidden-moisture
confirmation or structural conclusions, arrange the additional investigation
explicitly. The guide to
six levels of drone-inspection evidence
explains how documentation differs from measurement and diagnosis.
Thermal screening: where to investigate further
Thermal images show patterns associated with temperature differences. Their
interpretation depends on the materials and heating or cooling conditions.
FLIR's technical guidance explains that moisture can alter thermal behavior and
advises using other methods to check for moisture or water damage. A colored
anomaly alone should not become a confirmed leak in the report. See
FLIR's moisture and water-damage guidance.
For a roof moisture assignment, ask for paired visible and thermal images,
mapped anomaly locations, capture conditions and a clear distinction between
suspected and verified findings. If later temperature analysis is required, have
the analyst specify the necessary file format and metadata before collection.
Confirm that the delivered files can be opened in the intended software.
ASTM C1153-23 covers nighttime infrared
methods for locating wet insulation in certain roofing assemblies, including
aerial inspections. Its scope addresses roof construction, weather, equipment,
operator practices and verification using invasive tests. It is a standard
practice, not a universal drone-service certification.
If a bidder proposes work to that standard, ask how your roof fits its scope and
who performs the verification. Price any authorized sampling, access and
restoration separately when they are outside the aerial package. Do not infer
that a thermal flight includes them.
Measured roof data: how dimensions will be checked
A stitched overhead image, called an orthomosaic, or a 3D model can be a
separate deliverable. If you need dimensions for design, quantities or another
consequential use, specify the required units, coordinate reference, file format
and how the supplier will check accuracy.
USGS guidance treats flight geometry, camera calibration, control points and
independent checks as related parts of data quality. A sharp-looking model does
not substitute for those checks. See the
USGS imagery-calibration guidance.
Ask the bidder to price collection, processing and measurement verification
together. For a simple visual condition record, do not order a measured model
unless someone will use it.
Account for the site and flight window
Give the operator the address, roof outline, known roof construction, operating
hours, access restrictions and any limits on the launch area. Ask which areas
can be captured under those conditions and how obscured or inaccessible surfaces
will be reported. A quote that assumes an empty site may need revision when the
work must fit around deliveries or occupied areas.
Thermal work needs a capture window suited to the method and roof conditions. A
deadline should therefore include a plan for unsuitable conditions. Agree
whether a weather postponement moves the booking without charge, whether an
aborted visit incurs mobilization costs, and whether missed coverage caused by a
collection error will be recollected at the provider's expense.
In the United States, FAA guidance permits qualifying Part 107 night operations
without a night waiver, while retaining applicable pilot-training, lighting and
airspace requirements. Controlled-airspace authorization remains necessary where
applicable. LAANC can provide near-real-time authorization within approved
limits; other requests require further coordination or manual processing. See
the
FAA's Part 107 airspace-authorization guidance.
Ask the operator to identify the actual scheduling constraint for your location.
Do not treat every evening thermal flight as a special-waiver job or assume
every authorization is immediate.
Budget recurring inspections and in-house ownership
For repeat inspections, calculate the annual commitment separately:
Annual service cost = completed visits × agreed per-visit price + annual
hosting/comparison charges + separately approved extra work.
Using the hypothetical $650 visual package, four visits would total $2,600
before additional services or taxes. That calculation assumes an unchanged
scope and price; it does not assume a repeat-customer discount. Ask whether the
contract includes consistent roof-area labels, comparable viewpoints, change
annotations, original-file downloads and a defined retention period.
If you are considering an in-house program, compare complete costs over the same
period. Include aircraft and sensor acquisition, training, software, batteries,
maintenance, insurance, staff time, processing and backup coverage. Allocate
equipment expense across a realistic number of completed jobs rather than every
possible calendar day.
A useful screening formula is annual fixed program cost ÷ (outsourced price
per equivalent job − internal variable cost per job). It estimates the job
count needed to recover fixed costs only when the denominator is positive. It
also assumes equal deliverables and excludes capacity constraints. Owning a
drone does not, by itself, provide the specialist interpretation or roof
investigation the assignment may require.
Send bidders a scope they can price
Request a fixed total against the same written brief. Include:
- The building address, roof area and the decision the report must support.
- Required coverage, known construction and access constraints.
- Visual, thermal and measurement outputs, with sample report expectations.
- Any field verification or specialist opinion, naming who supplies it.
- File formats, original-data access, report timing and retention terms.
- Travel, postponement, revisit, revision and recurring-service charges.
Compare the resulting totals only after resolving exclusions. Choose visual
documentation for a visible-condition record, thermal screening with an agreed
verification plan for suspected moisture, and checked measurements when
dimensions matter. The useful price is the cost of finishing that specific job,
including the report and any follow-up work needed to make the decision.
Source notes
Last checked: September 5, 2026.