Drone roof & building inspections

What you actually get

• 4K still images of every roof face, ridge, hip, valley and flashing
• Close-up captures of suspected defects (slipped tiles, cracked mortar, blocked gutters)
• A written condition report you can pass to a roofer, surveyor or insurer
• Optional thermal overlay to spot damp ingress and missing insulation
• Raw image files supplied on request — your roof, your data

What it costs

£150–£400 for a typical house; more for listed buildings, large commercial roofs or anything needing airspace permissions. You'll see exact prices in your quotes — never a teaser rate that doubles on site.

What moves the price

• Roof size and complexity — a terraced two-up-two-down is not a converted oast house
• Airspace — sites near aerodromes or in controlled airspace need permissions and planning time
• Report depth — photo pack only vs. a full annotated condition report

What a drone actually catches up there

The faults that end up as ceiling stains rarely start in the middle of a roof face. They start at the junctions — the places where two materials meet, and the places nobody can see from the ground. A drone hovers a few metres off each one and photographs it square-on.

• Chimney stacks — cracked or eroded mortar joints, spalled brickwork, a developing lean, and failed lead at the base where the stack meets the tiles. The classic source of a damp patch on a chimney breast.
• Valleys — the internal gutters where two slopes meet. Debris dams, cracked valley tiles and worn lead linings all push water sideways under the tiles instead of down to the gutter.
• Flashing and abutments — lifted or torn lead, mortar fillets that have parted from the wall, gaps around soil pipes and vents. Small defects, modest repairs, and responsible for a disproportionate share of leaks.
• The wider roofscape — slipped, cracked or delaminating tiles, broken ridge and hip mortar, sagging or blocked gutters, and moss mats holding moisture against the surface.

The scaffolding question

To inspect a roof the traditional way, someone has to get up there — and getting up there is most of the cost. Scaffolding a typical house runs from several hundred pounds well into four figures before anyone has looked at anything, and it takes days to book, erect and strike. A ladder is cheaper but shows you the eaves and not much else: valleys, rear slopes and chimney tops stay hidden, and working-at-height rules limit what any sensible tradesperson will do from one. Walking the roof itself is how tiles get broken.

Worth being honest about the other direction too: a drone is the wrong tool when the question is structural or hidden. It can't lift a slate, probe a rafter, check the underlay or test how firmly anything is fixed. If the survey finds trouble, someone may still need hands on the roof — but then you're paying for access once, to fix a known problem, rather than paying for it just to find out whether one exists.

How the survey is actually flown

There's not much for you to do. The pilot checks the airspace, weather and site beforehand, then arrives, sets up a take-off spot in the garden or street, and runs pre-flight checks. The flight itself is usually 20–40 minutes: wide passes over each roof face for context, then close hovers at the chimney, the valleys and anything that looks suspect. Most domestic surveys take 30–60 minutes on site end to end.

Wind and rain are the variables. Every drone has a wind limit, and no competent pilot flies close to a building in gusts beyond it — so expect a weather window (“Tuesday or Wednesday morning”) rather than a fixed minute, and the occasional reschedule. Light matters too: in winter, low sun leaves north-facing slopes in shadow, so pilots may time the visit around it.

How sharp the pictures are — and what gets in the way

Current camera drones resolve cracked mortar and hairline tile damage from a safe stand-off — far better detail than binoculars from the pavement, and steadier than a phone photo taken one-handed off a ladder. What degrades the result is mostly physics:

• Stand-off distance — trees, overhead lines or a tight neighbouring plot can force the drone higher or further back, which costs detail
• Wind — motion blur on close-ups; a careful pilot waits rather than delivering soft images
• Light — an even grey sky is actually good for consistent detail, while hard low sun casts shadows that hide as much as they reveal

Photos vs. measurements

A standard roof survey gives you photographic evidence, not dimensions. If you need measurements — to order materials or quantify a repair — ask for photogrammetry when you request quotes: overlapping images processed into a measurable model of the roof. It costs more, takes longer to deliver, and not every pilot offers it.

The thermal add-on for leaks

A thermal camera reads surface temperature, and water changes how a roof holds and releases heat. Flown at the right time of day — usually early morning or after sunset, when temperature contrast is sharpest — a thermal pass can show damp insulation, the track of a leak across a flat roof, or heat escaping where insulation is missing or has slumped. It's the closest thing to seeing beneath the surface without lifting it.

Two caveats, because thermal gets oversold. It shows temperature anomalies, not water: a cold patch needs interpreting, and recent rain or sun-warmed sections can create false positives. And it's flown with different equipment, priced as its own line item — so say up front that you want it, and expect an honest pilot to tell you if conditions on the day won't produce a useful image.

Using a drone survey in an insurance claim

After storm damage, the gap between “the roof was fine before” and proving it is where claims slow down. Drone imagery helps close that gap: the files carry a timestamp and GPS coordinates in their metadata, every roof face goes on record systematically, and the same survey can be repeated after repairs to document the work. That's the kind of evidence a loss adjuster can actually use.

• Survey promptly after the event, before temporary repairs change what's visible — and keep the raw files, not just the report
• Tell the pilot it's for a claim, so they capture wide context shots as well as close-ups and the damage can be located on the building
• Check your policy or speak to your insurer before commissioning — some insurers send their own surveyor, and your evidence should add to theirs, not duplicate it

The legal bit, in plain English

Drone rules in the UK come from the CAA, and for a roof survey the practical points are short. The operator must be registered — an Operator ID, displayed on the aircraft — and the pilot must hold a qualification suited to flying in a built-up area, which for most residential work means an A2 CofC or a GVC. The rules themselves are mostly about distance: how close a drone may fly to people who aren't involved in the job. A pilot quoting for your roof has already judged whether your street, garden and neighbours fit within what their qualification allows; that judgement is part of what you're paying for.

Insurance isn't optional either. Commercial drone work in the UK must carry cover that meets aviation requirements, on top of ordinary public liability. Ask to see both the qualification and the certificate — a working pilot expects the question. Every pilot quoting through Sober Pilots has had both checked, and the check is dated.

How to brief a pilot

Pilots quote better with specifics, and two minutes of detail up front saves a round of questions later. Cover:

• The address and postcode, and the roof itself — pitched or flat, rough height, anything unusual (dormers, extensions, solar panels)
• Why you want the survey — a suspected leak, a pre-purchase check, storm damage, or a roofer's quote you'd like verified; it changes what gets photographed
• Access and surroundings — parking, where a drone could take off, large trees, and the nearest airfield if you know of one
• Your deadline, and whether you need the full written report or just the photo pack

What a decent quote includes

A fixed price, and a statement of what it covers: which outputs (photos, video, report, thermal), the turnaround time for the report, the weather-reschedule policy, and the pilot's qualification and insurance. If any of those are missing, ask — and treat reluctance as information.

After the flight: files, ownership and retention

Standard outputs are geotagged JPEG stills, 4K video clips and a PDF report; photogrammetry jobs add measurable models in their own formats. Two things to agree before the flight rather than after: whether you receive the raw image files — you usually can, and it matters if the survey ever ends up in front of an insurer or in a dispute — and how long the pilot keeps a copy. Most pilots retain imagery and flight logs for their own records and insurance for a period; if you might need the files re-supplied later, say so when you book.

On privacy: a roof survey inevitably catches the edges of neighbouring property. Working pilots plan around this — tight framing, no lingering, and removing incidental footage on request — and it's a fair thing to raise if you or a neighbour are concerned.