Every elevation, captured before the scaffold
A drone records every wall, balcony, window and parapet of a building in one systematic pass. Your building envelope consultant uses it to screen the building and decide where hands-on inspection is needed.
A screening tool for the people who sign off
The building envelope is everything that separates inside from outside: cladding, windows, sealant, balconies, membranes, flashings, parapets and the roof. When it fails, water gets in, and water in a wall is expensive long before anyone sees it inside.
Looking at a mid-rise or high-rise envelope properly has always meant access: swing stages, lifts, rope access or scaffold. That access is slow, disruptive for residents and costly to set up, and it is usually booked for the whole building before anyone knows where the problems are.
A drone changes the order. We fly each elevation in a planned grid, with enough overlap and resolution that the consultant can zoom into sealant joints, cracked stucco, stained brick, corroded railings and failed window perimeters. The images can also be built into an orthomosaic of each elevation or a 3D model of the building (see as-builts and digital twins). Where thermal imaging conditions are right, it adds evidence of wet materials and air leakage.
What it does not do is replace a professional's sign-off. The drone is a screening and documentation tool. A building envelope consultant, engineer or architect still examines critical areas up close, may open up assemblies, and writes and signs the report. Our job is to make their evidence complete and their access plan smaller.
Canadian and US programs, in general terms
| Where | What the rules require | Where a drone helps |
|---|---|---|
| British Columbia: strata depreciation reports | Under the Strata Property Act, strata corporations with five or more lots must get a depreciation report on a five-year cycle; the old option to waive it by vote is gone. Since July 1, 2025 only listed professionals (such as engineers, architects, technologists, appraisers, reserve planners and quantity surveyors) may prepare one, and it must be based on an on-site visual inspection. Deadlines for existing stratas are phased by region. | Complete, dated images of every elevation and the roof to support the preparer's site visit and the component inventory |
| Ontario: condominium reserve fund studies | Under the Condominium Act, 1998, a comprehensive study is required within the first year after registration, then updates at least every three years, alternating between updates with and without a site inspection. | Documentation for updates, and a record that shows change between study cycles |
| New York City: Local Law 11 (FISP) | Buildings taller than six storeys have exterior walls inspected on a five-year cycle by a Qualified Exterior Wall Inspector, with hands-on, close-up examination from scaffold or a suspended platform. Drones do not satisfy that requirement; the city has studied a pilot program for drones, and takeoff or landing in the city needs a police permit. | Pre-inspection screening and documentation, planning where close-up drops go |
| Other US cities | Chicago, Boston, Philadelphia, San Francisco and several other cities have their own facade ordinances with different height thresholds, cycles and filing rules. | Screening and documentation, subject to each city's rules and FAA Part 107 |
Why we describe rules generally
Strata, condominium and facade rules change, and each jurisdiction sets its own details. BC rewrote its depreciation report rules in 2024 and added the qualified-preparer list in 2025. New York's program grew out of fatal incidents, has been tightened over the years, and the city is still studying how new technology fits. Before you plan a program around a drone survey, confirm with your consultant and the authority that the current rules accept the evidence you intend to use. Our Canadian drone rules guide covers the aviation side.
Who needs what from whom
Building envelope consultant or engineer
- They need from you
- Systematic, overlapping images of every elevation at a resolution that shows sealant and cracks, with a way to locate each image on the building.
- You need from them
- Their capture spec: distance, resolution, which elevations, and areas they already suspect.
- On the DroneLink record
- They review in the DroneLink project and pin comments on the exact spots to examine by hand.
Strata council or condo board
- They need from you
- Evidence for owners, a defensible report, and a funding plan they can explain at the AGM.
- You need from them
- Council approval, access to the roof or a take-off area, and notices to residents about the flight days.
- On the DroneLink record
- The consultant's report and the drone images live in one project record the council can open by link. See for property managers and strata.
Residents
- They need from you
- To know when a drone will pass their windows and that images are used only for the building.
- You need from them
- Blinds closed if they prefer, and balconies clear where possible.
- On the DroneLink record
- We schedule by elevation and give the manager a simple notice to post.
Access contractor
- They need from you
- Knowing exactly which drops or areas need close-up work.
- You need from them
- Their constraints: anchor points, stage lengths, rope access limits.
- On the DroneLink record
- Marked-up images show where to go, so the access plan is sized to the problems, not the building.
Where facade surveys fail
Images without location
Hundreds of close-ups nobody can place on the building.
Treating the drone survey as the inspection
An owner skips the professional because 'the drone already looked'.
Glare and shadow
Direct sun on glass and light-coloured cladding hides detail; deep shadow hides the rest.
Questions
Can a drone be used for a depreciation report in BC?
It can support one. The rules require the qualified preparer to base the report on an on-site visual inspection, so a drone survey adds evidence, especially for high walls and roofs, but does not replace the preparer's own visit.
Can drones be used for Local Law 11 facade inspections in NYC?
Not as a replacement. FISP requires close-up, hands-on examination by a qualified inspector. Drone imagery is used for screening and documentation, and flights in the city need their own permits.
What does a building envelope consultant do with drone images?
They review each elevation for signs of failure, mark areas that need close-up inspection or testing, and use the images as documentation in their report.
How close does the drone fly to the building?
Close enough to meet the resolution the consultant needs, while keeping safe distance from the wall, balconies, and anyone not involved in the flight. The distance is set in the flight plan before the job.
Do residents need to be told about a facade drone survey?
Yes, it is good practice and often required by the strata or building's own rules. We give the manager a notice with dates, times and what the images are used for.
How often should a building envelope be inspected?
It depends on the building and the rules where it stands. BC stratas work on a five-year depreciation report cycle, Ontario condos on a reserve fund study cycle of at least every three years, and US facade ordinances set their own intervals. Many owners also add a flight after major storms.
What drives the cost of a facade drone survey?
Building height and number of elevations, the resolution required, airspace permissions, whether thermal or a 3D model is included, and how complex resident notices and access are.
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