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Temporary event buildings—including marquees, tents, stages and platforms—need a project-specific design and operating plan for wind, snow, fire and the site they will occupy. The safe starting point is not a generic wind speed or snow depth: it is documented limits set for the actual structure and location by competent professionals, paired with clear actions for erection, operation and dismantling. The applicable code, permits and fire requirements depend on the jurisdiction.
What does a safe design need to account for?
A temporary event building is safe only when its design, installation and use match the conditions it is expected to face. That means considering more than the structure’s nominal size or the weather forecast. The design brief should identify the intended use, geometry, audience and staff occupancy, equipment attached to or suspended from the structure, site conditions, environmental loads, and the planned erection and dismantling sequence.
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Ontario’s guidance says outdoor temporary performance and event structures should be designed by a professional engineer with relevant structural experience and should account for the intended purpose, applied loads and site-specific wind, rain and snow—including severe weather that may arise. That is a jurisdiction-specific example, not a substitute for checking the rules where the event will take place. Ontario’s temporary-structure guidance sets out its expectations for that province.
For a construction or event team, the practical distinction is between designing the structure and managing its safe delivery. Structural calculations and design decisions belong with qualified professionals; organisers, contractors and site managers need to give them accurate project information, follow the approved design, and understand what to do when conditions change. A design that assumes one configuration cannot automatically be treated as approval for a different layout, added equipment or altered anchorage.
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- Wind, rain and snow: establish the design criteria for the actual location, structure and use; obtain the supplier’s written limits and operating restrictions.
- Ground and anchorage: confirm bearing conditions and suitable anchoring arrangements rather than relying on a generic anchor detail.
- Fire and evacuation: assess material performance and coordinate the building’s arrangement with site exits, escape routes and emergency planning.
- Lifecycle controls: manage competence, design records, changes, erection, inspection or verification, weather monitoring and dismantling.
How do you set the design brief before choosing a structure?
Give the designer and supplier a brief that describes the event as it will actually be built and used. It should be specific enough to distinguish the approved configuration from possible alternatives, not merely state that the project needs “a marquee” or “a temporary stage.”
Record the structure’s intended purpose and geometry, its position on the site, expected audience and staff use, and anything that will be attached to or suspended from it. Include relevant event equipment and loads, the proposed erection and dismantling sequence, access requirements, and foreseeable changes or misuse that could affect stability. The HSE model for safe management calls for consideration of foreseeable misuse and construction and deconstruction hazards as well as the intended in-service use. The HSE model also says the final concept and its limitations should be communicated to the event manager and users.
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Ask the designer or supplier to identify the assumptions behind the design and the information still needed from the site team. If the team changes the footprint, configuration, supported equipment or anchoring arrangement, treat that as a design change requiring review—not as a harmless field adjustment. The design documentation should describe the project’s actual loads and limitations so the people building and operating the structure can follow it.
Before approving an option, confirm who is responsible for the design, installation, verification, change control and weather decisions. The division of responsibilities should be explicit: a supplier’s stated limit is not an event action plan, and an event manager’s monitoring plan is not a substitute for structural design.
How should wind and snow limits be established?
Wind and snow criteria must be set for the location, structure and configuration under the applicable code and by the qualified designer. There is no universal safe wind speed, snow depth or allowable snow load that can responsibly be applied to every temporary event building.
The Institution of Structural Engineers warns that a demountable structure is unlikely to withstand the same amount of wind, rain or snow as a permanent building such as a house or office block. Its guidance on procuring and using demountable structures recommends that suppliers state the design limits. Obtain those limits in writing for the intended site and configuration, and ask how approaching or exceeding them affects stability and permitted use.
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Snow deserves an explicit place in the design and operating discussion even when the event is expected to take place in a milder season. Ontario’s guidance calls for site-specific consideration of snow as well as wind and rain, including severe conditions. The project’s designer needs to establish what applies; the event team should not infer a permitted snow load from the appearance or apparent robustness of the structure.
What should a weather action plan say?
A weather action plan translates the structure’s documented limits into decisions people can carry out. It should state what is monitored, who is responsible, which conditions prompt action, how instructions are communicated, and what actions the responsible people are authorised and expected to take.
The Australian Building Codes Board’s Standard—Temporary Structures discusses action plans, communication of design wind loads to site managers, and a monitoring plan that identifies when measures are required. It describes an anemometer on the structure as one possible monitoring system and weather forecasts as another input. The exact monitoring method and response thresholds must be selected for the structure and event; the document is a jurisdiction-specific reference, not a universal operating rule.
A handheld anemometer may be one instrument within a defined monitoring arrangement, but buying or carrying one does not itself establish a safe operating limit. The event plan should explain where and how monitoring is done, who reads and communicates the information, and how it relates to the designer’s limits. Forecasts can help the team anticipate conditions, but the responsible people still need an agreed procedure for acting on observed conditions and changing forecasts.
Plan for the build and strike as well as the period when the audience is present. The HSE model calls for monitoring local environmental conditions during construction, use and dismantling. The ABCB standard’s commentary notes that guy ropes may loosen and supporting members may need checks. The project team should decide what checks are appropriate for its system and document who carries them out. Weather exposure or a change in conditions during erection or dismantling can make those periods important parts of the plan, not gaps between formal event operations.
Write the plan so that staff do not have to improvise the chain of responsibility during an alert. Identify who receives weather information, who can restrict access or stop use as directed by the plan, how messages reach affected staff and event managers, and how decisions are recorded. The precise thresholds and response actions must come from the project’s design limits and risk assessment, not from a generic template.
How do you check the site, ground and anchorage?
Check the proposed position and supporting ground before finalising the structure and its anchoring design. Bearing capacity, exposure and buried hazards are site-specific; a standard-looking anchor or a previous installation elsewhere is not proof that the arrangement suits this location.
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The HSE’s venue and site design guidance recommends considering prevailing wind direction, how topography may affect exposure, flooding, access and hazards from underground services before driving stakes or burying temporary services. These checks connect structural safety to site planning: a position that complicates access, creates exposure or conflicts with buried infrastructure can affect both installation and emergency arrangements.
The ABCB standard notes that anchorage depends on factors including site conditions and soil bearing capacity, as well as the structure and proprietary system. Its commentary describes anchors as critical to stability and safety. Give the designer or supplier the site information they request, establish the approved anchoring arrangement, and make installation checks part of the construction plan. Do not assume that a generic anchor schedule will suit every soil, floor, exposure or system.
Where site conditions are unknown or differ from the assumptions used in the design, stop and seek qualified advice before proceeding with the affected work. A change in anchor location or method can alter the arrangement the structure was designed around. Record the approved solution and any verified change so the site team is working from current information.
How should fire safety be integrated into the design?
Fire performance belongs in the structure design and in the event’s site and emergency planning. The materials proposed for the structure should be considered for their performance during fire, while the layout must work with appropriate exits, routes and emergency arrangements under the rules that apply locally.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchThe HSE safe-management model states that the temporary-structure designer should consider the materials proposed for the structure and their performance during fire while developing the design. That model places fire performance within design thinking rather than treating it as a last-minute operational add-on. Ask for the relevant material and design information, and make sure it is assessed by the people responsible for fire safety under the applicable local requirements.
At site level, the HSE advises that emergency exits and routes be considered in the site plan and that pinch points that could create dangerous overcrowding in an emergency be avoided. The event team should coordinate the temporary building’s position and use with the wider escape plan, so routes and exits are not undermined by its layout or the surrounding event setup.
Do not copy fire classifications, separation distances, escape dimensions or equipment requirements from a different jurisdiction or configuration. The source material does not establish universal numeric values for these matters. Confirm the required classifications and arrangements under local rules with the responsible fire-safety professionals, taking account of how the structure will be occupied and connected to the rest of the site.
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How do you manage erection, changes and dismantling?
Use controlled drawings and a safe work plan that match the approved design. The HSE model calls for competent designers and contractors, a site- and concept-specific risk assessment, attention to stability and dynamic loading, safe construction and deconstruction, traceable design records, and verification of the final design. It also calls for erection plans identifying components, work methods, equipment and protective measures.
Before construction starts, ensure the people doing the work have current instructions for the structure and understand the installation sequence and any relevant restrictions. Keep design records and the current drawings accessible to the people responsible for erection and site management. A document that exists only in a supplier’s office does not help a crew resolve a discrepancy on site.
Control changes before the structure is used. If an installation condition, configuration or component differs from the approved plan, document the difference and have it reviewed and verified by the appropriate competent person. The HSE model specifically calls for on-site changes to be documented and verified before use. Do not treat a verbal assurance or an unrecorded adjustment as a substitute for that process.
Make construction and dismantling part of the risk assessment, not just the event’s operating plan. The structure can face hazards during both phases, and site conditions can change while work is underway. State how the team will respond to weather or damage, where expert advice can be obtained, and who can pause work or prevent use when the plan requires it.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How do you compare suppliers or structure options?
Compare the safety evidence and the assumptions behind each option, not just its size, appearance or rental price. Two structures that look similar may have different documented limits, site requirements or operating restrictions.
- Design limits: request written limits for the intended configuration, location and use, including applicable wind, snow and rain assumptions and restrictions.
- Load assumptions: clarify how the design treats event loads, dynamic loading, attachments and suspended equipment.
- Ground and anchorage: ask what information is needed about the supporting surface, soil, anchors and installation conditions.
- Fire and evacuation: request material performance information and identify how the proposal can be integrated with exits, escape routes and emergency arrangements.
- Delivery controls: establish who supplies drawings and erection instructions, how competence and verification are addressed, how modifications are controlled, and who manages weather response.
Ask suppliers to explain limitations in terms event managers can act on. A limit that is stated but not connected to monitoring responsibilities, restrictions and escalation arrangements is difficult to use operationally. Clarify who interprets the limits, who receives relevant weather information and how a decision to restrict or stop use is communicated.
The UK Government’s guidance on procurement, design and use of temporary demountable structures provides another reference for this lifecycle perspective. For temporary fabric structures specifically, MUTA says its Best Practice Guide was reviewed following consultation in 2025 and is intended for parties supplying, specifying, managing or using them. Consult MUTA’s current guide alongside the applicable rules and project-specific advice; industry guidance does not replace local law or engineering.
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What should be confirmed before opening?
Before the public uses the structure, the responsible team should be able to show that the built arrangement matches the approved design, that relevant changes have been documented and verified, and that managers know the structure’s limits and response procedures.
- Confirm the final configuration and approved drawings are the ones used on site.
- Resolve discrepancies or changes through the required review and verification process before use.
- Confirm the ground and anchoring arrangement match the design assumptions and installation instructions.
- Ensure the weather plan names responsible people, monitoring methods, communication paths and actions tied to the documented limits.
- Coordinate exits, routes and emergency arrangements with the event site plan and the responsible fire-safety professionals.
- Make sure event managers know how to obtain expert advice if damage, an unexpected event or a design question arises.
These are management checks, not a replacement for required professional inspection, engineering verification, permits or regulatory approval. The applicable approvals and level of verification depend on the jurisdiction and the particular project.
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Why is a universal wind or snow number unsafe to rely on?
A generic number can give false confidence because a temporary structure’s limits depend on its design, location, configuration, anchorage and use. The cited guidance calls for site-specific design and documented supplier limits, but does not establish a single wind speed, snow depth or fire threshold valid for every event structure.
For a particular project, ask the supplier or designer for the approved design criteria and explain how those criteria translate into operating restrictions. If the event team cannot identify the applicable limits or who acts when they are approached, the gap is in the project’s information and management—not something that can be solved by guessing a threshold.
Frequently Asked Questions
Can an event organiser use a weather app as the only wind-monitoring method?
Forecasts are a useful input, but the cited Australian standard treats them as part of a monitoring plan alongside possible instrument-based monitoring. The event team should have a project-specific method and response procedure tied to the structure’s documented limits.
What should I do if the installed structure differs from the drawings?
Do not assume the difference is acceptable because the structure appears stable. Record the change and have it reviewed and verified by the appropriate competent person before the structure is used, as called for in the HSE management model.
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1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minuteDoes guidance from Ontario, the UK or Australia automatically apply to my event?
No. Those documents are useful examples of design and management principles, but each project must establish the applicable local code, approvals and fire requirements. Confirm jurisdiction-specific obligations with the responsible authorities and qualified professionals.
When should a temporary structure’s weather plan cover dismantling?
It should address dismantling as well as construction and event operation. Weather exposure and changing conditions can affect the work sequence, so the project team should define responsibilities and actions for the strike phase in its site-specific plan.
