A comprehensive installation plan for Windows and Doors —including aluminium, timber, and composite systems— ensures every stage, from pre-installation planning through to post-installation verification and client handover, is executed with precision, safety, and quality. Aluminium or timber composite window and door systems are available in various operational types, combining the natural beauty and insulation of timber on the inside with a durable, low-maintenance aluminium exterior. 

Here are 5 common types of Door and Window systems we install:

1. Casement Windows and French Doors

Description: Casement windows are hinged on one side and open outwards like a door, providing excellent natural ventilation. French doors are essentially large casement doors, typically used in pairs, that open onto a patio or garden.

2. Sliding Windows and Lift & Slide Doors

Description: These systems feature panels that slide horizontally past one another on rollers. Lift & Slide doors are a robust version, where the door panel is slightly lifted before sliding, creating an excellent seal when closed and allowing for large, expansive glass panels and unobstructed views.

3. Tilt and Turn Windows

Description: A highly versatile window type that can open in two ways: it can tilt inwards at the top for secure, consistent ventilation, or it can open fully from the side (like a casement) for easy cleaning from the inside or maximum airflow.

4. Bi-fold Windows and Doors

Description: Bi-fold systems consist of multiple panels that fold back on themselves in an accordion style when opened, effectively blurring the line between indoor and outdoor spaces.

5. Sash Windows (Vertical/Horizontal Sliding)

Description: A traditional style, particularly popular in period properties, featuring two sashes that slide vertically (or horizontally, in the case of a Yorkshire sash) within the frame.

We cover the following related services:

Pre-Installation Phase

1. Project Assessment and Site Survey
2. Design Assessment and Coordination
3. Create and review the Safe Systems of Works
4. Delivery Schedule Coordination

Installation Phase

1. Site Preparation
2. Layout, Marking and Pre-installation
3. Installation of Windows and Door units
4. Alignment, Adjustments and Testing

Post-Installation Phase

1. Sealing, Insulation, Waterproofing and Finishing
2. Cleaning, Detailing and Protection
3. Quality Assurance, Documentation and Handover
4. Client Training and Aftercare Support

Project Management and Documentation

Throughout the installation process, our site teams maintain detailed daily records, inspection reports, and QA checklists to track progress, resources, and compliance. Our Site Managers use structured project management tools to ensure the installation is delivered safely, efficiently, and on programme.

Our commitment

A comprehensive installation plan for Windows and Doors —including aluminium, timber, and composite systems— ensures every stage, from pre-installation planning through to post-installation verification and client handover, is executed with precision, safety, and quality. Following this methodology ensures that all elements meet the structural, thermal, and aesthetic performance requirements defined in the design specifications and regulatory standards.

We cover the following related services:

Pre-Installation Phase

1. Project Assessment and Site Survey
• Review all architectural, structural, and fabrication drawings, project specifications, and design intent related to window and door systems.
• Conduct detailed site surveys to verify openings’ dimensions, substrate condition, plumb and level tolerances, and surrounding interfaces.
• Evaluate structural openings and anchorage points for adequacy and identify any required adjustments or strengthening works.
• Assess site accessibility and logistics for material deliveries, storage, and lifting operations (particularly for large or heavy units).
2. Design Assessment and Coordination
• Review system drawings and confirm interface compatibility with adjacent envelope elements (cladding, curtain walling, roofing, internal partitions).
• Collaborate with designers and structural engineers to eliminate impractical fixing details and confirm fixing load paths.
• Verify integration of waterproofing membranes, vapour barriers, and insulation continuity.
• Develop an installation sequence that minimises on-site handling and ensures correct load distribution and alignment.
3. Create and review the Safe Systems of Works
• Prepare RAMS (Risk Assessments and Method Statements) specifically covering glass handling, manual handling, lifting operations, and working at height.
• Identify potential risks such as fall hazards, entrapment, or lifting equipment misuse, and define control measures.
• Ensure all operatives are trained and competent in system-specific installation techniques and the use of PPE.
• Develop emergency procedures, including rescue plans for elevated works.
• Prepare detailed lifting plans considering the weight distribution and fragility of materials, using appropriate lifting gear to minimise potential damage.
4. Delivery Schedule Coordination
• Coordinate deliveries in line with the installation sequence to minimise on-site storage.
• Inspect all units upon arrival for damage, dimensional conformity, and correct labelling.
• Store windows and doors in clean, dry, and secure conditions to prevent damage, warping, or contamination.
• Verify all required accessories (fixings, gaskets, trims, membranes, sealants) are present before installation begins.

Installation Phase

1. Site Preparation
• Set up secure and weather-protected storage areas for units and sensitive materials.
• Ensure all tools, lifting equipment, safety barriers, and access systems (scaffolds, MEWPs, or towers) are available and inspected.
• Prepare the openings by removing debris, checking tolerance compliance, and applying pre-installation waterproofing membranes or sealants where specified.
• Confirm all operatives are briefed on the method statement, exclusion zones, and safety protocols.
• Ensure all installation personnel are equipped with the required personal protective equipment (PPE), have the appropriate training and have been briefed on all required emergency and rescue procedures.
2. Layout, Marking and Pre-installation
• Using laser levels and plumb lines, mark the reference lines for horizontal and vertical alignment.
• Check squareness and dimensions of the openings against approved shop drawings.
• Where applicable, install subframes, cavity closers, or thermal breaks prior to setting the main frame.
• Verify the substrate’s load-bearing capacity and fixings’ pull-out strength before commencing installation.
• Where required, install brackets, framing elements, or support rails that will serve as the primary attachment points for the door or window systems.

     3. Installation of Window and Door units

·     Window Systems:

• Lift and position the window frame using appropriate handling aids (suction lifters or mini-cranes).
• Secure frames using mechanical fixings per system guidelines, ensuring even spacing and avoiding frame distortion.
• Check for plumb, level, and squareness after initial fixing.
• Install sashes, glazing beads, and seals, ensuring correct gasket compression and operation of opening lights.
• For systems with operable elements, install mechanical or automated control systems and verify that window movements are smooth and unrestricted.
• Confirm that the windows are plumb, level, and uniformly spaced.
• Apply sealants if required to ensure adequate weather protection

·     Door Systems:

• Position and temporarily fix door frames, ensuring correct alignment and level threshold positioning.
• Install door leaves and adjust hinges for smooth and balanced operation.
• Fit associated ironmongery, locks, and closers, checking alignment and full functional movement.
• Confirm correct interface between frame and adjacent finishes or floor buildup.
• Fit drainage or cover caps and finishers that complement both the aesthetic and functional aspects of the door system.

     4. Alignment, Adjustments and Testing

• Conduct full alignment verification using laser or digital level tools.
• Test functionality of all operable parts (handles, locks, hinges, restrictors) and ensure weather seals are continuous and effective.
• Apply shims and final fixings as per the manufacturer’s torque settings.
• Verify proper operation of drainage holes, weep slots, and vent systems.
• For complex door or window systems, conduct operational tests to ensure that mechanisms, drive systems, or manual operations are working reliably and smoothly.

Post-Installation Phase

1. Sealing, Waterproofing, and Finishing
• Apply perimeter insulation and airtightness membranes as per system specifications.
• Install external and internal sealants, maintaining proper joint geometry and adhesion to compatible substrates.
• Fit finishing trims, cover caps, and interface flashings for weatherproofing and aesthetic completion.
• Conduct water and air infiltration tests (where required by specification).
2. Cleaning, Detailing and Protection
• Remove all debris, stickers, and residues from frames and glazing using approved cleaning agents.
• Protect finished surfaces from ongoing works using protective film or sheeting.
• Verify all internal finishes are undamaged and clean before handover.
3. Quality Assurance, Documentation and Handover
• Perform final QA inspection against design, functionality, and tolerance requirements.
• Prepare as-built drawings, inspection reports, and warranty documentation for all installed units.
• Complete a client walkdown, demonstrating operability and maintenance procedures.
4. Client Training and Aftercare Support
• Provide client or end-user training on window/door operation, safety restrictors, and maintenance routines.
• Establish aftercare service arrangements, including warranty response procedures and maintenance schedules.

Project Management and Documentation

Throughout the installation process, our site teams maintain detailed daily records, inspection reports, and QA checklists to track progress, resources, and compliance. Our Site Managers use structured project management tools to ensure the installation is delivered safely, efficiently, and on programme.

Our commitment

By adhering to this structured installation methodology, we ensure that every aluminium or timber composite window and door system is installed to the highest standards of precision, durability, and aesthetic excellence. This approach supports long-term performance, energy efficiency, and client satisfaction, aligning with our trade’s code of best practice and continuous commitment to quality workmanship and site safety.