Supply & Fit.
Windows, doors, bifolds, sliding systems and roof glazing, with product selection and professional installation discussed together. A coordinated service for homes, extensions and suitable trade projects across Hertfordshire and North London.
From selection to installation.
Supply and fit means the agreed products and their installation are organised together, under a clearly defined quotation. It can simplify communication about specifications, delivery dates, measurements and fitting responsibilities.
We help homeowners and suitable trade customers discuss different window, door and glazing options. Before ordering, the exact product system, safety glazing, ventilation, finish, access and installation requirements must be confirmed.
More than windows. Complete glazing options.
Whether you are updating one entrance or planning a full property project, the choice of system and proper installation matter equally.
uPVC windows
Casement, flush casement, sash-style and other suitable uPVC configurations with different colour and glazing options.
Aluminium windows
Contemporary glazing systems for appropriate openings, with specification-led frame and glass choices.
Timber and heritage windows
Traditional looks for suitable properties, subject to manufacturer ranges and planning requirements.
Front and composite doors
Entrance doors with style, hardware, glazing and locking options depending on manufacturer.
Stable, uPVC and aluminium doors
Back, side and entrance-door choices for different household needs.
Bifold doors
Folding garden-facing doors that can open much of a suitable aperture.
Sliding and French doors
Wide glazed entrances and hinged French doors, with threshold and access considerations.
Roof lanterns and roof windows
Roof glazing packages coordinated with structure, upstands, safe lifting and weatherproofing responsibilities.
Whole-house upgrades
Discuss consistent styles, glazing and phased installation across multiple openings.
A joined-up service from start to finish.
The process begins with what you want to achieve, then moves to a confirmed specification and an appropriate fitting programme.
Tell us about the property
Share photographs, postcode, number of openings, preferred materials and whether it is a new build or replacement.
Survey and choose a specification
Review the openings, suitable systems, glazing, security, ventilation, finishes, thresholds and access.
Confirm quote and supply
Agree exact products, measurements, lead times, removal and finishing responsibilities before ordering.
Install and review
Fit the supplied products to the agreed scope, check operation and discuss any documentation and aftercare.
Fewer loose ends. More clarity.
Separating manufacture, supply and fitting between different parties can work, but it requires very clear responsibilities. A coordinated supply-and-fit job allows specification, ordering and installation planning to be discussed together.
We still agree who is responsible for surveying, delivery, removals, structural preparation, lifting, weathering, internal making good, warranty and any necessary approvals. A good quotation should explain the exact inclusions.
Supply & fit or fitting only?
Both services can be useful, depending on whether you already have suitable products ordered.
| Consideration | Supply & fit | Installation only |
|---|---|---|
| Product purchase | Included as agreed in the quotation | Product is provided by you or your contractor |
| Design and specification | Discussed with the supply arrangements | Normally provided by the product purchaser or supplier |
| Dimensions and compatibility | Confirmed as part of the agreed supply process | Responsibility must be clearly established |
| Fitting and finishing | Agreed installation and included finishing | Agreed fitting scope and exclusions |
| Warranty and certification | Product and fitting responsibilities clarified | Supplier, installer and compliance roles must be defined |
Both options depend on the suitability of the building and product system. Product guarantees, work warranties and certification are not interchangeable.
Styles worth exploring.
Images illustrate window, door and glazing options, not claims of completed DF projects.
Other ways DF can help your project.
Our service and product collections explain the different options for repairs, full replacements and installation.
Serving Hertfordshire and North London.
DF Installations is based in Hatfield and considers enquiries throughout Hertfordshire, parts of North London and nearby Bedfordshire. Share your postcode to confirm location and availability.
Surrounding towns and villages can be considered depending on the project. Area names are deliberately not links.
Supply and fit FAQs.
Straight answers about costs, suitability, installation and what to expect.
What does window and door supply and fit include?
The agreed product supply and installation are coordinated under one scope. Your quote should specify glazing, fittings, removal, seals, finishing and exclusions.
Can you supply and fit just one window or door?
Suitable individual replacements can be considered alongside whole-house projects. Pricing depends on product, location and access.
Can you supply bifold and sliding patio doors?
We can discuss suitable bifold and sliding door systems for prepared openings and appropriate site requirements.
What is the difference between uPVC and aluminium?
They offer different maintenance, appearance, profile and cost options. The correct choice depends on the system and property.
Can you supply stable and composite entrance doors?
Suitable stable, composite, uPVC and aluminium entrance products may be discussed subject to supplier availability and specifications.
Do you supply roof lanterns?
We can discuss suitable roof glazing packages, including the required interfaces with structural preparation, upstands and roof weathering.
How much does supply and fit cost?
The quotation depends on dimensions, materials, glazing, hardware, number of units, removal, access, making good and any building works.
How long does supply and fit take?
Lead times depend on the selected manufacturer, bespoke specification and site readiness; fitting time depends on quantity and complexity.
Will you remove and dispose of old windows?
Only if included in the agreed quotation. We will clarify removal, disposal and any making-good work.
Are energy-efficient double-glazed windows available?
Appropriately specified systems may improve performance compared with old units. Compare complete product values and applicable regulatory standards.
Do replacement windows and doors require certification?
Qualifying replacement installations in England must comply with applicable Building Regulations; the relevant competent-person or Building Control route should be confirmed.
Can builders request supply and fit?
Yes. We consider suitable builder and trade enquiries with drawings, system details and a clear division of responsibilities.
Can you fit windows I already bought?
We also consider suitable installation-only enquiries, subject to measurements, manufacturer instructions and suitability.
Where does DF Installations work?
Hatfield, St Albans, Welwyn Garden City and surrounding Hertfordshire areas, parts of North London and nearby Bedfordshire, subject to project location.
New glazing. One considered plan.
Send the property postcode, photographs and the styles you have in mind. We’ll discuss suitable supply-and-fit options and an accurate quotation.
Request your free quote ↗