Aluminium Double Door Installation: The Complete Tool List (And What You Can Skip)

Short answer: no - aluminium double doors don't require exotic tools you've never heard of. But there's a catch.

The tools you need depend entirely on what arrives at your site. If you're working with a pre-assembled door set - frame fitted, glazing installed, hardware mounted - the tool list is short: drill, level, screwdriver, sealant gun, and a few packs of frame fixings. We ship aluminium double doors this way from our factory in Shaanxi because it eliminates the most common on-site errors.

If you're installing from a knockdown kit (frame only, glazing separate), you'll need a few more specialist items - a glazing tool, setting blocks, and glass suckers for handling the double-glazed panels. These aren't hard to find, but they're not in the average homeowner's toolbox either.

Over 19 years of manufacturing aluminium doors for export to the UK, Europe, and beyond, we've seen what goes wrong when the right tools aren't on-site. This guide covers what you actually need - not what a textbook says you need, but what our installation partners carry in their vans every day.

Pre-assembled or Knockdown - This Changes Everything

The tool list for an aluminium double door installation depends on one question: does the door arrive pre-assembled (glazing fitted, hardware mounted) or as a knockdown kit (frame separate, glazing separate)?

A pre-assembled door set from our factory needs basic installation tools - drill, level, screwdriver, sealant gun. A knockdown kit adds glazing tools, setting blocks, and glass handling equipment to the list. We'll cover both scenarios below.

This distinction matters more than the door style. Whether you've ordered Black Aluminium Internal Glass Doors for an interior project or Residential Aluminium Sliding Glass Doors for a patio opening, the delivery format - not the door type - determines your tool requirements.

Essential Tools for Aluminium Double Door Installation

Measuring and Checking Tools

Tape measure, spirit level (600mm minimum), plumb bob

Before you touch the door, measure the opening at three points - top, middle, and bottom of each side. Aluminium frames have minimal tolerance for out-of-square openings: more than 3mm diagonal difference and you'll be fighting the frame all day. A 600mm spirit level is the minimum; 1200mm is better for tall double-door frames.

Don't skip the plumb bob. A spirit level tells you if the reveal is vertical at the point you place it; a plumb bob tells you if it's vertical the whole way down. In older buildings with settled walls, these can differ by 5mm or more - enough to prevent an aluminium door from closing properly.

Cutting and Drilling Tools

Hacksaw or mitre saw, cordless combi drill, HSS drill bits, masonry bits

You'll drill two materials: aluminium (for pilot holes in the frame, if not pre-drilled) and masonry (for wall fixings). These require different bits.

For aluminium: use HSS (high-speed steel) bits - 3mm pilot, then the clearance size for your fixing screws. Run the drill at medium speed with light pressure; high speed and heavy pressure will grab and tear the aluminium, leaving ragged holes. A drop of cutting fluid or even WD-40 on the bit makes a noticeable difference.

For masonry: SDS bits in a combi drill with hammer function. The fixing type depends on your wall - resin anchors for brick, sleeve anchors for concrete, butterfly toggles for hollow stud walls. Using the wrong fixing is the single most common installation failure we see in the field, according to GGF's technical installation standards.

Fixing and Fastening Tools

Flat-head and Phillips-head screwdrivers, socket set, rivet gun (for some commercial frames)

Most aluminium door frames use self-tapping screws or mechanical fixings that require a Pozzi or Phillips drive. A socket set is useful for anchor bolts and some hinge adjustments. For commercial storefront installations, a rivet gun may be needed for cleat fixings - check the specific fixing schedule for your door set.

Safety Equipment (PPE)

Safety glasses, work gloves, dust mask, ear protection

This is non-negotiable. Cutting aluminium produces sharp swarf that can cause eye injuries. Drilling masonry generates silica dust. Handling double-glazed panels (25–40kg each) without gloves risks lacerations from the frame edges. And any power-tool work warrants ear protection.

Professional installers don't skip PPE - and neither should you. The FGIA installation and performance standards explicitly reference safe working practices as part of compliant installation.

Specialist Tools for Aluminium Double Doors

The following tools aren't "exotic," but they're the ones most likely to be missing from a general DIY toolkit. You'll only need them if your door arrives as a knockdown kit or requires on-site adjustments.

Aluminium Shears (or Nibblers for Thicker Sections)

Most aluminium door frames arrive pre-cut to the ordered size from the factory - ours do. But on-site adjustments happen: trimming an outer frame flange to fit around a protruding brick, cutting a drainage slot, or trimming a bead that's slightly over-length.

For thin sections (1.2–2.0mm wall thickness, typical for residential door profiles), aviation tin snips or dedicated aluminium shears work well. For anything thicker, a power nibbler is cleaner than a hacksaw and won't clog the teeth the way aluminium tends to do.

Important: if the frame has a powder-coated or anodised finish, mask the cut line with tape first. Cutting directly through the coating will chip it back 2–3mm from the cut edge - invisible once assembled, but only if you cut on the right side.

Crimping Tool - Weatherstripping and Gasket Sealing

If your aluminium double doors have weatherstripping or a gasket system, a crimping tool secures the gasket into the frame channel. This creates a weathertight seal between the door leaf and the frame, preventing air infiltration and water ingress.

The crimping tool compresses the gasket lip into the aluminium channel, locking it in place. Without proper crimping, the gasket can pull out over time - particularly on exposed external doors subject to wind pressure and thermal cycling. It's a small tool that prevents a large call-back.

Glazing Tools: Setting Blocks, Glazing Shovel, Glass Suckers

If your door arrives as a knockdown kit, you'll need to fit the double-glazed unit into the frame yourself. This requires three tools the average homeowner doesn't own:

Setting blocks (hard rubber, approximately 100mm × 25mm) - these sit under the glass unit to support its weight and maintain the correct edge clearance. Without them, the glass rests directly on the frame and will crack under its own weight within weeks.

Glazing shovel or bead lifter - for pushing glazing beads into the rebate channel. A wide-blade putty knife works in a pinch but risks scratching the frame. A proper nylon glazing shovel costs under £10 and won't mark the finish.

Glass suckers (minimum two) - a standard double-glazed door panel weighs 25–40kg. Lifting it by hand into a vertical frame without suckers is both dangerous and nearly impossible to position accurately. A pair of single-cup suction lifters makes the job safe and controllable.

Note: if the door arrives pre-glazed from the factory (as all SGL door sets do by default), you won't need any of these tools on-site. This is one of the reasons we pre-glaze: it eliminates the most technically demanding and physically dangerous step of the installation. For more on glass options, see our guide on selecting the right glass for your aluminium doors.

General vs Specialist Tools Comparison

*Only if on-site frame trimming is needed. **Only if weatherstripping requires on-site fitting rather than factory-fitted.

Step-by-Step Installation Process with Tool Usage

Step 1: Measure and Prepare the Opening

Use the tape measure to check the opening at three points on each side (top, middle, bottom). Check with the spirit level for plumb, and use the plumb bob to verify the full-height vertical. Record all dimensions - any diagonal difference over 3mm needs correction before you start.

Remove the old door (if applicable) and clear the reveal of debris, loose mortar, and protruding fixings. Check that the sill or threshold is level and at the correct height.

Preparation accuracy directly affects compliance with BS 6375 performance standards for doors, which define the weathertightness and operational performance your installation must maintain.

Step 2: Install the Frame with Mechanical Fixings

Position the aluminium frame in the opening. Use plastic packers (shims) at each fixing point to achieve a level, plumb fit - don't rely on the screws to pull the frame square. Drill pilot holes through the frame into the wall substrate using the appropriate drill bit (HSS for aluminium, SDS/masonry for the wall).

Fix the frame using mechanical fixings appropriate to the wall type:

• Solid brick/block: sleeve anchors or frame fixings with resin
• Concrete: masonry screws (e.g., Thunderbolt-style) or expansion anchors
• Timber stud: screws into the stud, not the plasterboard
• Steel stud: self-tapping metal screws with washers

Check level at three points during fixing - after the first two fixings, after the mid-point fixings, and after the final fixings. Adjust before fully tightening each time.

Step 3: Glaze the Door Panels (Knockdown Kits Only)

If the door arrives pre-glazed, skip this step entirely.

For knockdown kits: place setting blocks at the quarter-points of the sill bead. Using two glass suckers, lift the double-glazed unit and lower it onto the setting blocks. Ensure the glass is centred in the rebate with equal clearance on all sides. Push the glazing beads into the rebate channel using the glazing shovel - start at the corners and work toward the centre of each side.

Step 4: Fit Hardware and Ironmongery

Attach hinges, handles, locking mechanisms, and any other hardware using the appropriate screwdrivers. Most SGL door sets arrive with hardware pre-fitted; if any items were removed for transit protection, refer to the fitting instructions for the correct screw types and torque settings.

Check that all hardware operates smoothly. Adjust hinge alignment if the door leaf drags or doesn't close evenly - this is usually a frame-levelling issue, not a hardware defect.

Step 5: Seal and Weatherproof

Apply external-grade silicone sealant around the entire frame perimeter - head, jambs, and sill. Tool the sealant into the joint with a sealant gun and a wet finger or smoothing tool. Don't use acrylic caulk - it shrinks and cracks within 12 months.

If weatherstripping was not factory-fitted, use the crimping tool to install the gasket into the frame channel, working from one end to the other without stretching the material.

Step 6: Final Checks and Adjustments

Open and close both door leaves several times. Check for:

• Even gap between the meeting stiles (should be 3–5mm)
• Smooth latching without force
• No daylight visible around the frame when closed (indicates sealing gap)
• All locking points engage properly

Make fine adjustments using an Allen key on the hinge bolts. A properly installed aluminium double door should operate with fingertip pressure and latch without slamming.

Common Installation Mistakes (And the Tools That Prevent Them)

Over 19 years of manufacturing and shipping aluminium doors, we've seen the same on-site errors repeat across markets. Most of them come down to using the wrong tool - or the right tool used incorrectly.

1. Drilling Aluminium at High Speed

Aluminium is soft and gummy. Run a standard drill bit at full speed into an aluminium frame and it'll grab, jerk, and leave a ragged, oversized hole. The fix: medium speed, light pressure, and HSS bits. A drop of cutting fluid makes a significant difference. If the hole is for a fixing and it's oversized, the screw won't grip - and the frame will work loose over time.

2. Skipping the Level Check

It's tempting to "eye it" when the frame looks close enough. It never is. An aluminium double door frame that's 2mm out of plumb will have the doors drifting open or failing to latch. The fix: check level at three points during frame fixing - after the first two fixings, after the mid-point fixings, and after the final fixings. Adjust before fully tightening each time.

3. Using the Wrong Wall Fixings

We've seen installers use frame fixings designed for timber stud walls in solid masonry - they don't expand properly and pull out under wind load. The fix: match the fixing to the wall type. Masonry: sleeve anchors or resin anchors into solid brick/block. Timber frame: wood screws into the stud, not the plasterboard. Steel stud: self-tapping metal screws.

4. Omitting the Silicone Seal

The most common call-back we see isn't a broken door - it's a leak. Water ingress around the frame perimeter, typically at the head (top) and sill (bottom) joints. The fix: a proper external-grade silicone seal applied after frame fixing, tooled into the joint with a sealant gun and a wet finger or smoothing tool. Don't use acrylic caulk - it shrinks and cracks within 12 months.

5. Over-tightening Frame Fixings

Aluminium frames deform under excessive screw torque. Over-tighten and the frame bows inward, causing the doors to bind or the weatherstripping to compress unevenly. The fix: firm but not forced. If you're using a combi drill, set the clutch to a low torque setting for the final tightening - then finish by hand with a screwdriver.

DIY vs Professional Installation - Which Is Right for You?

Our recommendation: If you're installing a pre-assembled door set into a straightforward brick or block opening and you're comfortable with a drill and spirit level, a competent DIYer can achieve a professional result. For knockdown kits, commercial installations, or projects requiring Building Regulations compliance, professional installation is strongly recommended - and proper installation is required to maintain your warranty coverage.

Building Regulations and Compliance (UK)

If you're installing aluminium double doors in England or Wales, the installation must comply with:

Approved Document L (Conservation of Fuel and Power): Doors must meet minimum energy-efficiency standards. For new builds, the maximum U-value for doors is 1.0 W/m²K; for replacements in existing dwellings, it's 1.6 W/m²K. All SGL doors are manufactured to meet or exceed these thresholds.

Approved Document Q (Security): Doors that are easily accessible must be secure by design. This means multi-point locking, laminated or toughened glass, and cylinder guards. SGL door sets come with these features as standard.

Approved Document B (Fire Safety): In some building types (e.g., flats with shared escape routes), fire-rated doors may be required. See our commercial aluminium fire doors for rated options.

Approved Document M (Access): Threshold heights and door opening forces must meet accessibility requirements for commercial and public buildings.

Note: In most cases, replacement door installations in the UK must be either self-certified by a Competent Person Scheme member (e.g., FENSA, CERTASS) or approved by Building Control. DIY installations require a Building Control application.

FAQ - Aluminium Double Door Installation Tools

The Bottom Line

Aluminium double doors don't require exotic tools - but they do require the right ones, used correctly. The three tools that separate a professional installation from a problematic one: a proper spirit level (not a short one), the correct wall fixings for your substrate, and an external-grade sealant gun. If you're working with a knockdown kit, add glass suckers and setting blocks to that list.

The single best thing you can do for installation quality, though, is order a pre-assembled door set. When the door arrives with glazing fitted, hardware mounted, and fixings pre-drilled, you eliminate the majority of on-site error opportunities. Every SGL door set ships this way by default - because in 19 years, we've learned that the fewer decisions left to the installation site, the better the result.

Need installation guidance for your project?

We provide detailed fitting instructions with every door set we ship, and our technical team is available to walk through specific site conditions before you order. If you're specifying for a commercial project - such as a Commercial Aluminium Storefront Door - that requires certified installation, we can connect you with experienced installers in your region.

Contact our technical team →