New extension glazing
Bifolds, sliding doors, fixed glazing and windows for extensions with prepared openings.
DF INSTALLATIONS · HATFIELD · HERTFORDSHIRE · NORTH LONDON
Window and door installation for builders
For extension builders, general building contractors and construction companies who need reliable installation support for windows, front doors, bifolds, sliding doors and roof glazing in Hertfordshire and North London.
20+ years' fitting experienceWindows · Doors · Roof glazingSupply & fit / installation onlyHertfordshire · North London
WHO WE WORK WITH · Builders & construction contractors
Your glazing installation partner.
For extension builders, general building contractors and construction companies who need reliable installation support for windows, front doors, bifolds, sliding doors and roof glazing in Hertfordshire and North London.
Discuss supply responsibility, programme, site readiness, product specifications and access before a project is confirmed.
SPECIALIST TRADE SERVICES
Installation support for real projects.
The right service depends on your system, site and agreed responsibilities. Here are the installation packages we can discuss.
Replacement windows
Install replacement uPVC, aluminium and timber units during refurbishment programmes.
Entrance and rear doors
Composite, uPVC and aluminium front doors, French doors and rear entrances.
Roof lanterns and roof windows
Specialist roof glazing fitting coordinated with roofers and structural preparation.
Trade installation only
Fitting products supplied by a builder or their approved manufacturer, subject to checks.
Finishing and handover
Agree seals, trims, thresholds, operation checks and who completes adjacent finishes.
WHY WORK WITH DF?
Built around trade priorities.
Less coordination pressure
Discuss one specialist glazing installation package instead of arranging several separate trades.
Site readiness checks
Address finished opening size, support, access, lifting and moisture protection before booking fitting.
Practical scheduling
Coordinate installation timing with roofing, plastering, floor levels and other trades.
Scope clarity
Make sure supply and fixing responsibilities are written down before work starts.
PRACTICAL PROJECT PLANNING
Built around a builder's schedule.
Send architectural drawings, an opening schedule, product details and the planned site dates. We'll discuss measurements, suitable access, fitting preparation, glazing safety, how thresholds and external weathering will be formed, and what is excluded from the installation quotation.
Send the details
Tell us the project address, intended systems and what needs installing.
Review the specification
Share drawings, unit schedules, manufacturer details and access requirements.
Agree scope & timing
Confirm supply, lifting, installation interfaces, finishing, programme and compliance responsibilities.
Fit & hand over
Carry out agreed work, check operation and discuss any outstanding items.
RELATED DF SERVICES
Explore products and installation services.
Detailed information about the windows, doors and roof glazing we can discuss, plus our existing trade-relevant services.
MORE TRADE SERVICES
Other ways we support contractors.
LOCAL COVERAGE
Trade installation in Hertfordshire & North London.
Based in Hatfield, we welcome suitable commercial and subcontract installation enquiries across Hertfordshire, selected parts of North London and nearby Bedfordshire. Share the project postcode to confirm travel and availability.
TRADE QUESTIONS
Frequently asked questions.
A few practical details to settle before appointing a glazing subcontractor.
Can you fit bifolds supplied by our supplier?
Potentially, yes. We need the manufacturer installation guidance, system details, sizes and site conditions before confirming installation-only work.
Can you install glazing in a new extension?
We can discuss prepared openings in extensions; the main contractor must coordinate structural design and approvals where required.
What information should a builder send?
Plans, elevations or schedule, site postcode, product manufacturer, opening dimensions and the desired date are the most useful starting points.
Can you take several jobs across the year?
We welcome repeat-project enquiries. Capacity and scheduling are confirmed for each job rather than assumed.
What areas do you cover?
DF Installations is Hatfield based and considers projects across Hertfordshire, parts of North London and nearby Bedfordshire, subject to location, capacity and scope.
How do we request a trade quotation?
Use the enquiry page to share your company details, site postcode, drawings, planned timescales, product specification and the work you need completed.
WORK WITH DF INSTALLATIONS
Let's discuss your next project.
Tell us about your company, the site location, your products and your installation schedule. We can discuss whether the work is a good fit.
Request a trade quotation ↗