A supply only glazing guide is most useful before you request a price, not after the doors or windows have been manufactured. Ordering aluminium glazing without installation can be an excellent route for self-builders and capable trade teams, giving you control over the fitting programme and access to premium systems. It also places the responsibility for survey accuracy, site readiness and installation firmly with the buyer or their appointed installer.
For the right project, supply only offers genuine value. You can specify the same high-performance bifold doors, sliding doors, windows and roof glazing used on professionally installed projects, while coordinating fitting around your own builder. The key is to treat the order as a technical package rather than a simple product purchase.
What supply only glazing actually includes
Supply only means the glazing product is manufactured to the agreed specification and delivered for installation by others. The exact package should be confirmed at quotation stage, but it commonly includes the aluminium frames, sashes or panels, sealed glass units, hardware, gaskets, fixings specified for the system, and any agreed cills, trickle vents or accessories.
It does not normally include a final site survey, structural checks, opening preparation, unloading assistance, installation, perimeter sealing, making good or disposal of packaging. Those boundaries matter. A large sliding door can be heavy, awkward to handle and sensitive to installation tolerances; it should not be left to a team that has not planned lifting, access and protection.
At Bifolding Door Factory, supply-only customers can still specify established aluminium systems rather than compromising on performance. A Smarts Visofold 1000 Bifold Door, Schuco ASFD75 Bifold Door or Cortizo COR Vision Sliding Door can be configured around the project, but correct manufacture depends on receiving correct information at the point of order.
Why choose a supply-only route?
The main attraction is control. Trade buyers may have trusted installers already on site, while self-builders may be managing a staged build where the glazing installation needs to follow a carefully planned sequence. Supplying the products directly can avoid duplicated labour allowances and makes it easier to coordinate doors, windows, steels, cladding and internal finishes.
It can also be cost-effective, though it is not automatically the cheapest option. Savings on installation must be weighed against the cost of a competent survey, handling equipment, specialist labour, consumables and the risk of a measurement error. If an opening is out of square, the threshold detail has not been formed correctly, or glass is damaged during handling, the remedy may be more expensive than an installation service.
Supply only works best when there is a clear chain of responsibility. Your builder or glazing installer should know who is taking final dimensions, who checks structural support, who sets the finished floor level and who signs off the installation for Building Regulations purposes.
Measuring openings: the point where most problems start
Do not measure from architectural drawings alone. Drawings are essential for planning, but site-built openings can vary from the stated dimensions through render, insulation build-up, steel tolerances and floor construction. Final manufacturing sizes should be based on a physical survey of completed or reliably set-out openings.
Measure the width at the top, middle and bottom, then the height at both sides and through the centre. Check diagonals to identify whether the opening is square, and record the depth of the reveal. Your installer must also allow an appropriate fitting tolerance around the frame rather than ordering to the tightest opening size.
Thresholds deserve particular attention. A low threshold can create a refined connection between house and garden, but it must work with finished internal floor levels, external drainage and weathering. A threshold set too low may create water ingress risk; one set too high can leave an unwanted step. This is not a detail to resolve when the delivery lorry arrives.
Before placing a supply-only order, confirm these four essentials:
- final structural opening sizes and clearances
- finished floor level inside and external paving or drainage level outside
- glass handling route, including gates, access width and lifting equipment
- which party will install, seal, adjust and certify the completed work
Choosing the right aluminium system and glass
The frame system should follow how the opening will be used, not simply the lowest headline price. Bifold doors suit projects where the priority is opening a wide aperture for entertaining. Sliding doors generally retain larger glass areas and finer vertical divisions when the doors are closed, making them a strong choice for framed garden views and year-round daylight.
For example, the Smarts Visofold 6000 Bifold Door and Origin OB49 Bifold Door offer different design and configuration considerations, while systems such as the Schuco ASE80 Sliding Door and Cortizo COR Vision Plus Sliding Door are aimed at projects seeking premium sliding performance and slim contemporary sightlines. Panel size, opening configuration, location and budget will influence the sensible choice.
Thermal performance is equally dependent on the whole specification. Aluminium frames with a thermal break, combined with energy-efficient glazing, help reduce heat loss and internal surface condensation. However, a quoted glass U-value is not the same as the U-value for the complete door or window. Ask for performance information for the full system and intended glass build-up.
Glazing choices should account for orientation and exposure. South- and west-facing elevations can benefit from solar-control glass where overheating or glare is a concern. Laminated glass may be appropriate for safety, security or acoustic reasons. Obscure glass protects privacy in overlooked areas, while toughened safety glass is required in critical locations. The best choice depends on the room, the opening and the wider building design.
Colour and hardware should be finalised before manufacture. Popular finishes such as anthracite grey, black and dual colours can transform the appearance of an extension, but a colour decision also affects lead time and should match other external details. Check handle finish, hinge colour, trickle vent position and whether a cill is needed rather than assuming they are standard.
Compliance, security and installation quality
A supply-only purchase does not remove the need to meet Building Regulations. Depending on the scope of work, thermal performance, safety glazing, ventilation, means of escape and structural support may all need consideration. Replacement windows and doors can also require notification or certification through the relevant competent person route. The person arranging the work should establish this before ordering.
Security is another whole-installation issue. Premium multipoint locking and tested components are valuable, but poorly fixed frames, incorrect packing or inadequate adjustment can undermine their benefit. Use an installer experienced with the specific product type, particularly on large-format sliders and multi-panel bifolds. The glass unit, frame, packers, fixings and perimeter seal all work together.
Delivery, checking and storing your glazing
Plan delivery as carefully as installation. Confirm whether the vehicle can reach the property, whether there are width or height restrictions, and where frames and glass can be placed safely. Large sealed units may require mechanical handling or a dedicated glass lifter. Keep the route clear before the delivery date, not while the driver is waiting.
Inspect the order as it is unloaded. Check labels against the order confirmation, count every item, photograph any apparent damage and report concerns promptly. Do not remove protective film unnecessarily, and store frames upright, dry and protected from impact. Glass should be kept on suitable A-frames rather than leaning unsecured against a wall.
When supply and installation may be the better choice
Supply only is not a test of commitment to a project. There are cases where a supply-and-install service offers better protection and better value, especially where openings are complex, access is difficult or the design includes substantial roof glazing. It creates a single responsibility for survey, manufacture, installation and adjustment.
If you choose supply only, appoint the installer early and share the proposed specification before anything is ordered. A good installer will spot practical issues in time to solve them. That conversation is often the difference between a premium aluminium glazing package that looks excellent on delivery day and one that performs exactly as it should for years afterwards.