Professional installation for residential and commercial properties, from precise measurement through to a clean, carefully finished installation.
Accurate dimensions
Weather protection
Accurate dimensions
A door or window installation is about more than fitting a frame into an opening.
At D.J FIRST, we work from the dimensions and conditions of the property, taking care over measurement, positioning, sealing and finishing throughout the installation.
From individual residential windows and entrance doors to larger commercial glazing systems, our work is planned around the building and the requirements of each project.

Carefully measured and installed doors for entrances, internal spaces and replacement projects.

Window installation matched to the property, opening and specification, with attention to alignment, sealing and finishing.

Installation of glass curtain wall systems for contemporary residential and commercial buildings.
Careful sealing around the installation helps reduce air leakage and unwanted draughts.
Weather sealing, flashing and properly finished joints help protect the opening from rain and moisture.
Appropriate installation methods and careful sealing help reduce unnecessary heat loss around doors and windows.
From replacing a single entrance door to installing windows throughout a home, we work with the requirements of individual properties and renovation projects.
We also undertake installation work for commercial buildings where accurate measurement, coordination and careful finishing are essential.
Every installation is different. The final cost depends on the type and number of openings, measurements, existing conditions, access and the work required to complete the installation properly.
Indicative installation pricing
Starting prices are provided to give you an idea of typical installation costs. A final quotation is confirmed after the project requirements have been assessed.
Send us some basic details about the property and the installation you’re considering.
We’ll contact you to discuss the project and arrange a suitable time where a site assessment is required.
Measurements, existing conditions and installation requirements are reviewed before the final quotation is prepared.
Once the work is confirmed, the installation is arranged and completed with attention to fit, sealing and finish.
Doors and windows are among the most visible parts of a building, but much of an installation’s quality is found around the edges — in the measurements, the positioning, the sealing and the finishing that are easy to overlook once the work is complete.
D.J FIRST focuses on getting those details right.
Our approach is straightforward: understand the property, measure carefully, install properly and leave the opening clean, secure and ready for use.
Whether it’s a residential replacement or a larger commercial glazing project, we treat the installation as part of the building rather than simply a product being fitted into it.
Tell us what you’re working on and we’ll help you arrange the next step.