The Installer’s Pre-Order Checklist for Aluminium Doors and Windows

For installers, builders, and trade buyers, a smooth project often comes down to what happens before the order is placed.

A well-specified aluminium door or window order can help avoid delays, costly remakes, site frustration, and awkward conversations with customers. On the other hand, small details missed at ordering stage can quickly become expensive problems once manufacturing is underway.

That is why having a clear pre-order checklist matters.

Whether you are ordering bifold doors, sliding doors, aluminium windows, or roof glazing products, taking a few extra minutes to confirm the specification can save time and stress later on. Here is a practical checklist to run through before signing anything off.

1. Confirm the opening measurements properly

This is the most important step on the list.

Before placing an order, make sure the opening has been measured accurately and consistently. Do not rely on assumptions, old drawings, or rough site figures. A survey should confirm the actual finished opening size and highlight any issues that could affect fitting.

Check:

• overall width and height
• whether the opening is square
• lintel and structural support positions
• floor build-up levels
• plaster line and finished floor level
• any site tolerances that need to be allowed for

It is also worth confirming whether the quoted size is the frame size or the structural opening size. Confusion here can lead to serious ordering mistakes.

2. Decide whether a cill is needed

Cills are often overlooked until late in the process, but they need to be confirmed before manufacture.

The right cill choice will depend on the product type, installation method, weather exposure, and the finish required externally. Some projects need a cill for water management and neat finishing, while others may not.

Before ordering, confirm:

• whether a cill is required
• the cill depth
• projection needed beyond the wall
• how the cill works with the external finish
• whether it affects overall frame height

Missing this step can create fitting issues on site or lead to an untidy external finish.

3. Check if trickle vents are required

Trickle vents should never be treated as an afterthought.

Depending on the project type and current building requirements, trickle ventilation may need to be included in the order. Leaving this decision until late in the day can mean delays, changes to the specification, or non-compliant installations.

Make sure you confirm:

• whether trickle vents are required for the product
• the correct vent size and equivalent area needed
• where they will be positioned
• whether the customer has been made aware of how they affect appearance

This is especially important on replacement projects where ventilation requirements need to be considered carefully at order stage.

4. Confirm handle choice and hardware finish

Handles can seem like a small detail, but they matter both visually and practically.

Before placing the order, confirm the exact handle style, colour, and finish. It is also worth checking whether the customer expects handles internally and externally to match other ironmongery already in the home.

Things to confirm:

• handle style
• colour and finish
• internal and external handle requirements
• keyed or non-keyed options where relevant
• any matching hardware preferences across multiple products

It is much easier to get this right before manufacture than to deal with disappointed customers later.

5. Choose the correct threshold type

Threshold choice can affect appearance, accessibility, weather performance, and everyday usability.

For example, some customers want a low threshold for a cleaner transition between inside and outside, while others need a more weather-rated option for exposed locations. The right answer depends on how the doors will be used and where they are being installed.

Before signing off, check:

• whether the threshold needs to be low, standard, or rebated
• weather exposure at the installation point
• accessibility requirements
• internal and external floor levels
• drainage considerations
• whether the customer understands the trade-off between appearance and performance

This is one of the key details that should be agreed early, not discussed when the product arrives.

6. Review the glass specification carefully

Glass specification should always be confirmed in full, especially if the customer has specific performance or privacy expectations.

This includes not only the glazing type, but also any safety, solar control, acoustic, or privacy requirements. A product can look right on paper and still be wrong for the property if the glass has not been thought through properly.

Check:

• double or triple glazing
• toughened or laminated safety glass where required
• obscure or privacy glass
• solar control glass for south-facing elevations
• acoustic glass for noisy locations
• any special performance requirements

If there is more than one product on the project, make sure the glass specification is consistent where needed.

7. Confirm colour inside and out

Colour errors are avoidable, but only if this point is checked properly.

Do not assume the customer wants the same finish inside and outside. Dual-colour options are popular, and it is important to confirm exactly what has been agreed.

Before ordering, make sure you have:

• the exact frame colour reference
• confirmation of whether it is single or dual colour
• matching information for ancillary items
• any requirements for handles or hardware to coordinate with the frame finish

A quick colour check at ordering stage can prevent one of the most obvious and frustrating specification mistakes.

8. Review opening configuration and handing

This is especially important for bifold and sliding door orders.

Installers should confirm exactly how the product will open, where the traffic door sits if relevant, and what the customer expects in everyday use. A technically correct door can still be wrong for the room if the opening configuration has not been fully discussed.

Check:

• inward or outward opening
• left or right handing
• traffic door position
• stacking direction
• access route to garden, patio, or side return
• furniture or kitchen layout that may affect usability

A quick review of configuration can save major headaches once the frames arrive on site.

9. Think about delivery access before ordering

Even a perfectly specified order can create problems if delivery access has not been planned.

Large aluminium frames and glazed units need safe, practical access for unloading and movement on site. This is particularly important on tight urban sites, properties with restricted parking, or projects with limited side access.

Before placing the order, confirm:

• delivery address details
• access restrictions
• parking or unloading limitations
• whether extra labour or lifting equipment may be needed
• storage space on site
• whether the site will be ready to receive the product

Planning this early helps avoid failed deliveries or unnecessary delays.

10. Double-check every line of the order acknowledgement

Once the order acknowledgement comes through, take the time to read it properly.

This is the last opportunity to catch mistakes before the product moves fully into production. Do not just skim dimensions and price. Review every line against what was surveyed, quoted, and agreed with the customer.

Look again at:

• sizes
• configuration
• colour
• glazing
• hardware
• vents
• cill details
• threshold type
• delivery details

A five-minute check here can prevent weeks of disruption later.

A simple checklist that saves time

For trade buyers, accuracy at ordering stage is not just about admin. It protects margins, helps installations run smoothly, and gives customers more confidence in the whole process.

A solid pre-order process helps reduce errors, avoid delays, and make sure the aluminium doors and windows arriving on site are exactly what the project needs.

In short, the more detail you confirm before ordering, the fewer problems you are likely to face later.