Window Cleaning Contract: Frequency, Safety, Access

Key takeaways

A window cleaning contract is mostly an access and safety document; the cleaning method is the simple part.
Frequency should follow glass type, exposure and visibility, not a flat number copied from another building.
Anything above ground level, and anything requiring roof access, anchors, ropes, cradles or lifts, is competent-contractor work — critical.
Verify certification, insurance, method statements and rescue plans before the first visit, annually after that.
Inspect from inside and outside: spotting, drips on sills, smeared frames, missed panes at mullions, and residue on glass seals.

What does a window cleaning contract actually cover?

It covers access, safety, frequency, coverage and inspection — and only then the cleaning itself. A contract that names a price per pane without naming how the contractor reaches the pane has skipped the part that generates incidents, complaints and insurance claims.

The document needs to answer four questions before price is discussed. Which glass surfaces are included, inside and out? How often? How does the contractor reach each surface safely and legally? And how will both parties agree that the work is done? Everything below hangs off that structure, and cleaning contractor management is where the contract sits inside your wider vendor routine.

How should frequency be set?

Set frequency by elevation, orientation, glass type and how visible the glazing is to tenants and the public, then check the result against the cleaning budget. A single flat frequency across a portfolio is how buildings end up over-cleaning back stairwells and under-cleaning the lobby.

Reasonable starting points for a typical commercial building:

Ground floor and storefront glass: monthly to quarterly, depending on foot traffic, fingerprints, and proximity to roads or planters.
Low-rise glass to about three storeys, reachable by water-fed pole: quarterly, or six-weekly for retail frontage.
Mid and high-rise curtain wall: twice a year is common; quarterly where the building is a landmark or the cladding shows every streak.
Atria and interior glazing: quarterly, cleaned from inside, with a separate method statement for high interior surfaces.
Frames, sills and tracks: every visit, otherwise black residue returns within days.
Post-construction or first clean: before occupancy, once fit-out dust has settled, not during the last week of works.

Two adjustments matter more than the baseline. Buildings near construction, highways or industry collect a film that needs more frequent cleaning to avoid etching. And a building with a south or west curtain wall in summer will show hard water spotting within an hour of a badly timed clean, so schedule those elevations for early morning or overcast days.

Which access method fits which building?

Access drives both risk and price, and the contract should say which method is approved per elevation — not leave it to the crew on the day.

Access method	Practical reach	Typical use	What the manager verifies
Water-fed pole from ground	Roughly 4 storeys	Low-rise, retail, glazed entrances	Purified water supply, pole control, drip management, pedestrian control
Ladders and step platforms	Low level only	Ground-floor and canopy glass	Ladder inspection records, footing, two-person handling — critical
Mobile elevating work platform	Variable	Atria, low facades, awkward elevations	Operator ticket, machine inspection, ground conditions, traffic plan
Rope access (abseil)	Any height	Mid and high-rise facades	Technician certification, anchor plan, backup lines, rescue plan — critical
Suspended cradle or swing stage	Any height	Towers and continuous curtain wall	Engineer-designed rigging, commissioning records, trained operators, roof protection
Drone or robotic cleaning	Niche	Height where access is impossible	Regulatory approvals, insurance, and a documented fallback method

The line a manager should hold firmly: choose the outcome and confirm the method is documented and safe. Do not choose the anchor point, do not rig, and do not send a staff member onto a roof to "just check the ropes". That work belongs to the contractor, under their health and safety program.

Scope note: Rope access, anchor installation, cradles, swing stages, elevating platforms and any work at height sit with the contractor and their competent, certified technicians — critical. A property manager's role is to verify documentation, coordinate access and notice, and stop the work when the paperwork is missing. Installing or inspecting anchors yourself is outside your remit.

What has to be verified before the first clean?

Ask for the package once, then refresh it annually and whenever the crew changes. The contract should state that no work proceeds until the package is accepted.

Certification: rope access technician certification (IRATA or equivalent scheme) with expiry dates, and platform or lift operator tickets where relevant.
Insurance: general liability and workers' compensation coverage current for the contract term, with the building named where the contract requires it.
Method statement and risk assessment: per elevation, naming anchors, backup lines, exclusion zones, weather limits and rescue arrangements.
Rescue plan: written, site-specific and rehearsed, following the principles in the CCOHS working at heights rescue plan guidance — a technician suspended without a retrieval plan is an emergency, not an inconvenience — critical.
Site rules: roof access procedure, key control, elevator protection, and the hours the contractor may occupy loading bays or lobby space.
Notification: tenant notice periods for abseil work outside windows, and how interior cleaning is scheduled around meetings.

Keep the whole package in one place with expiry dates visible. Vendor insurance and compliance checks walks through the annual cycle, and the practical equipment side is covered in window cleaning safety and equipment.

What should the contract say about weather, notice and stoppages?

Weather is a contract term, not small talk. Wind speeds, lightning risk, ice and heavy rain all stop rope and platform work, and the contract should say who decides, who is notified and whether the visit is rescheduled at no charge.

Include:

Stop-work authority: the contractor's supervisor can stop for weather; the property manager can stop for unsafe conditions, unauthorised access or missing documentation — critical.
Rescheduling: aborted visits rescheduled within an agreed window, without a return trip charge.
Notice: minimum notice to tenants for abseil and interior work; a named contact for both sides.
Access windows: hours when ropes may hang over entrances, and the requirement for barriers and spotters below.
Damage protocol: what happens if a pane, seal, frame or light fitting is damaged, and who pays for the report.

A contract that is silent on stoppages gets argued about in the invoice instead.

How do you inspect window cleaning properly?

Inspect in daylight from both sides, and inspect the same panes each cycle so you are comparing like with like. Standards to check:

Spotting and film at the edges and lower corners, where a poor rinse leaves residue.
Drips and runs on frames, sills and tracks — proof that water and dirt were pushed down rather than removed.
Mullion and gasket lines, where a squeegee never quite reaches.
Hard water spotting on sun-exposed elevations, which etches if repeated.
Interior glass, for smears on the tenant side, especially on partitions and meeting room walls.
Sealant and frame condition, reported rather than repaired by the cleaning crew — critical.

Photograph the failed panes with the elevation and floor noted. A claim is strongest when it names a location and shows the defect at a comparable angle each time.

Where does window cleaning stop and building maintenance start?

The contractor cleans glass. Anything else is a report, not a repair: failed sealant, cracked panes, corroded frames, loose cladding, water ingress at sills, damaged anchors. Those belong to the envelope or structural specialist, and the cleaning visit is often the first place they are noticed.

Write that reporting duty into the contract, with a route and a response time. A crew that photographs and reports a failing seal on a Tuesday saves a much larger repair later, and it costs nothing to require it. On that boundary, roof and exterior inspections explains what the facade inspection cycle should capture from the building side.

How should interior glazing and glass balustrades be handled?

Interior glass is a separate line item with a different method: no squeegee water running down a wall, no drips onto finished floors, no aggressive chemistry on filmed or frosted glass. Balustrades, atrium glazing and glass doors carry a fingerprint load that needs more frequent touch-point cleaning, and some glass carries a coating that reacts badly to acidic products.

Confirm in the contract which products are approved for coated, filmed or laminated glass, and require a sample clean on one panel before the first full visit. If the result is acceptable, that panel becomes the reference standard for the whole building. Glass balustrade and atrium cleaning covers the access problem those spaces create.

How should results be documented?

Every visit should produce a record a manager can review without being on site: date, elevations completed, access method used, crew, weather stoppages, panes excluded and why, defects reported, and photographs of the finished glass.

That record answers the questions that arrive later — was the north elevation done in July, was the sealant issue reported before the leak, was the contractor insured on the day. It also keeps a multi-site portfolio consistent, because two buildings inspected against different standards cannot be compared or budgeted together.

Frequently asked questions

How often should high-rise windows be cleaned?

Most commercial curtain walls are cleaned twice a year, quarterly where visibility and prestige matter. The decision should follow exposure — urban fallout, nearby construction, hard water risk — rather than a template. Buildings that wait for visible dirt usually pay for etching or spotting later.

Who is allowed to clean windows above ground level?

Only trained, certified technicians working under a documented method statement with rescue arrangements in place — critical. CCOHS publishes fact sheets on anchors, fall arrest systems and rescue plans under its fall protection guidance, which is the body of reference a contract should point to.

Is a water-fed pole safer than abseiling?

Both are safe when used properly and both are hazardous when improvised. Poles avoid work at height entirely for low-rise glass, so they remove the primary risk. Abseil access is appropriate for tall facades but requires certified technicians, planned anchors and a rescue plan.

Can the cleaning contractor repair damaged seals or frames?

No. Sealant, frame and glazing repairs belong to envelope or glazing specialists, not the cleaning crew. The contract should require the crew to photograph and report defects, and should name who responds and within what time — critical for water ingress.

What should a manager do if a crew starts without documentation?

Stop the work and ask them to leave the elevation until the package is produced. This is the one area where stopping a contractor mid-visit is always the right call, and the contract should state that a stop for missing documentation carries no penalty to the building.

Specify access first, then price

Frequency, safety and access boundaries are the three clauses that decide whether a window cleaning contract holds up. Get them written, verify the certification package every year, inspect the same panes each cycle, and keep a dated record of every elevation.

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