Double glazed aluminium doors are a smart upgrade for homes and offices — they combine sleek looks, thermal performance, and durability. But when a customer walks into a shop, it helps to know what questions to ask and what decisions to make so you buy the right door and avoid surprises. Below is a practical, step-by-step guide you (or your client) can follow from first inquiry to final sign-off.

Double glazed aluminium doors: Step-by-Step Guide for Buyers

1. Set your needs & budget first

Decide main priorities: energy saving, noise reduction, security, aesthetic, or accessibility.
Fix a realistic budget that includes materials, delivery, installation, and disposal of an old door. (Installation labour can be 20–40% of the total cost.)

2. Measure & request a site survey

Do not rely on sketchy measurements — ask the supplier for an on-site survey.
Confirm: finished opening width & height, wall thickness, floor level differences, and threshold clearance.
Note any structural constraints (masonry, lintel load, existing frame condition).

3. Understand glass & glazing options

Glazing thickness: Typical double-glazed units use two glass panes (4–6 mm each) with a spacer gap of ~12–16 mm (total IGU thickness ~20–28 mm).
Glass types: Low-E coating for thermal control; Argon-filled cavities for better insulation; toughened (tempered) or laminated glass for safety and security.
Acoustic rating: Ask for Rw or STC values if soundproofing matters.
Ask the shop for the unit’s U-value (thermal transmittance) — lower is better.

4. Choose the right aluminium frame

Profiles: Slim profiles are modern; thicker/heavier profiles add strength.
Thermal break: Choose a thermal-break profile (polyamide barrier) to reduce heat transfer in climates with temperature extremes.
Finish: Powder-coating or anodising — check colour options and weather warranties.
Ensure the frame material and wall fixings are suitable for your building type.

5. Hardware, security, and accessibility

Locks: Consider multipoint locking for entrance doors. Check lock grade and certification.
Hinges & pivots: Heavy-duty, corrosion-resistant fittings; more than two hinges for heavy doors.
Thresholds: Low thresholds (DDA compliant) for accessibility or higher thresholds for better water resistance.
Handles & accessories: Test samples for feel and ergonomics.

6. Installation, tolerances & site preparation

Ask who performs the installation — in-house installers or subcontractors — and check experience.
Confirm how they will seal and insulate around the frame (foam, sealant, flashing), and how they will handle drainage/weeping.
Agree on tolerances and level/vertical plumb requirements before work begins.
Discuss whether structural adjustments are needed and who will pay.

7. Warranties, lead time & after-sales

Get written warranties for glazing units, aluminium finish, hardware, and installation workmanship — note durations and what voids the warranty.
Ask about lead time from order to delivery and typical installation window.
Clarify payment terms (deposit, progress payments, final payment on sign-off).
Check the availability of spare parts or replacement seals.

8. Final inspection and maintenance plan

On completion, inspect seals, glass, frame finish, lock operation, and threshold drainage.
Take photos and note any defects before signing the final acceptance.
Ask for a simple maintenance guide (cleaning, lubrication of locks/hinges, and when to replace seals).

Questions to ask the supplier (quick checklist)

Can you show a finished installation nearby or sample panels?
What is the double-glazed unit’s U-value and acoustic rating?
Is the glass tempered, laminated, or both?
Do you use Argon filling and Low-E coating?
Is the frame thermal-break? What finish options and warranties?
Who does the installation, and what is the warranty on workmanship?
What is the total cost, including removal of the old door and site clearance?

Final tip

Bring photos and rough measurements when you visit the shop, but always insist on a professional site survey and a written specification before placing an order. A clear contract that lists glass type, IGU thickness, frame profile, finish, hardware brand, lead time, and warranty will protect you and ensure you get the performance you paid for.

If you’re interested in double-glazed aluminum doors, stainless steel gates and railings, aluminum windows, kitchen cabinets, wall cabinets, or home interior design and installation, visit our office today.

What to know before buying double glazed aluminium doors

Table of Contents