Questions to Ask a Pergola Supplier Before You Sign

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Before you sign with a pergola supplier, ask how the structure is designed and measured, which materials and finishes are used, who installs it, and what the written specification includes. A reliable manufacturer will answer each question clearly and put the details in writing.

Ask How the Pergola Is Designed and Measured

A custom pergola starts with an accurate survey of the site. Ask whether the supplier measures on site or relies only on photos and your estimates. Good suppliers measure, check levels and walls, and confirm where posts, beams and fixings will sit.

Ask who prepares the drawing and whether you will receive it before production begins. A written drawing lets you check spans, post positions and the overall height against what you expect to see from your balcony or terrace.

Confirm the Materials and Their Thickness

Iron and aluminum pergolas can look similar in photos but behave differently over time. Ask which material is proposed for the posts, beams and rafters, and what profile sizes and wall thicknesses are used.

Which profiles are used for the main structure?
What is the wall thickness of the steel or aluminum sections?
Are the connections welded, bolted or both?

Thin sections may look fine at first but can flex under wind or snow loads. Ask the supplier to explain why the chosen sizes suit your span.

Check the Finishing and Corrosion Protection

Finishing affects how long the pergola keeps its appearance, especially near the sea. Ask whether the iron parts are hot-dip galvanized before powder coating, and how the aluminum is surface treated.

Also ask about colour options, how the coating is applied, and how the finish is protected at cut edges and welds. Request samples or a visual reference so the colour you approve matches what is delivered.

Understand Installation and Who Does It

Some suppliers only manufacture, while others install with their own crew. Ask who will fix the pergola to the wall or floor, what fixings are used, and whether the surface can carry the load.

Clarify who is responsible for the wall anchors, any drilling into structural concrete, and site cleanup. These points are often overlooked and can cause disputes later if they are not written down.

Review the Written Offer and Specification

Your offer should describe exactly what is included: drawings, materials, finishes, installation, transport and any follow-up visits. Vague descriptions leave room for misunderstandings about what was agreed.

Ask for the specification in writing before you approve it. Check that the dimensions, colours and scope match your conversations, and keep a copy of the approved version.

Ask About Safety, Standards and Approvals

Pergolas that cover a terrace or support loads should be designed with safety in mind. Ask how the supplier considers wind exposure, snow and the weight of any shading fabric or plants.

For railings and balustrades, the Israeli standard SI 1142 applies. The supplier should be able to explain how the design follows general requirements, and the exact values should be confirmed with the project engineer rather than assumed.

Frequently asked questions

Should I ask for a drawing before production?

Yes. A drawing lets you check the layout, heights and spans before anything is made. It also gives you a clear reference if changes are needed later.

Is galvanizing necessary for an iron pergola?

Hot-dip galvanizing followed by powder coating is a common way to protect iron from corrosion, especially in coastal or humid conditions. Ask the supplier which protection process they use and how it is applied.

Who is responsible for fixing the pergola to the building?

This should be stated in the written offer. Confirm whether the supplier installs the anchors or whether your contractor does, and who covers any site preparation.

What if the colour I receive does not match my sample?

Ask for a physical sample or a clear colour code in the specification. Approve the colour in writing before production so there is a shared reference at delivery.

Common mistakes to avoid

Many buyers accept a verbal agreement and skip the written specification, which leads to disputes over size, finish or installation scope. Always approve the drawing and written offer before production starts.

Our recommendation

Compare at least two written offers that list the same materials, dimensions, finishes and installation scope so the differences are easy to see. Choose the supplier who measures on site and explains the design clearly.

Summary

Ask about measurement, materials, finishing, installation, written specification and approvals before you sign. A clear written offer protects both you and the manufacturer.

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