Cold draughts creeping in around old doors and fogged-up glass can make your home feel uncomfortable and drive up your heating bills.
We replace tired or failing doors with made-to-measure double glazing doors, fitted by FENSA-registered installers, backed by a free home survey and a 10-year guarantee.
Each door is specified with A‑rated 28mm argon‑filled low‑E sealed units, warm‑edge spacers and tested perimeter seals to improve efficiency and reduce condensation.
Strong, insulated frames use thermal breaks, internal beading and multi‑point locking to enhance security and performance for homes across Manchester.
You can choose laminated inner panes for added security and acoustic options to cut down traffic noise.
All work is supported by factory quality checks, proper installation tolerances, condensation risk assessment and full FENSA and manufacturer paperwork to protect your warranties.
Read on for details on sizing, prices, installation steps and simple maintenance tips.
Takeaways
- A‑rated argon‑filled units with low‑E glass cut heat loss and bills, with centre‑pane U‑values independently verified.
- Laminated inner panes, internal beading and multi‑point locks through the frame provide PAS 24‑level attack resistance.
- Thermally broken frames, warm‑edge spacers and continuous Q‑LON gaskets reduce cold spots, draughts and internal condensation risk.
- Documented glass build‑up, gas fill, spacer type and U‑values supplied in writing before manufacture and installation proceed.
- FENSA registration, manufacturer guarantees and full handover paperwork protect your investment and simplify any future warranty claims.
How to Choose Made-to-Measure Double Glazing Doors With A-Rated Sealed Units
Start by checking the actual figures on the paperwork, not just the brochure. You want an A-rated 28mm argon-filled sealed unit with a low-E coating, and a measured centre-pane U-value that lines up with the overall door U-value, so it meets current Building Regulations and the targets for your home in Manchester. The frame should be thermally broken aluminium or insulated uPVC, with warm-edge spacers and a continuous Q-LON gasket so you’re not paying to heat the street through cold edges and draughts.
Ask the glazier to confirm the glass build-up (for example 4/20/4, low-E inner pane), gas fill concentration and spacer bar type in writing, and to show how that matches the declared performance. A decent supplier will also give you frame psi values, the full installation tolerances, and a factory QA certificate, so you know the unit has been put together properly and the gas isn’t going to disappear in a few years.
On security, specify laminated inner panes, internally beaded sashes and a tried-and-tested multi-point locking system through the frame, all geared to meet PAS 24 or equivalent. Before you sign off, insist on documented, independently measured U-values, a basic condensation-risk assessment for your opening, and a FENSA certificate number on completion, so you’ve got proof the job is up to scratch if you ever sell.
How A-Rated Sealed Units Cut Heat Loss, Noise and Condensation
With an A-rated 28mm argon-filled sealed unit you can see the difference in three places: heat loss, noise and condensation. We look at the measured centre-pane U-value, sound reduction index (Rw) and condensation risk so you know exactly what you’re getting, not just what it costs.
Low‑E coated glass, warm‑edge spacer bars and an argon fill pull the U‑value down and cut conductive heat loss through the pane. That keeps more heat in the room, so your boiler or heat pump doesn’t have to work as hard and you’re not heating the street. The warm‑edge spacer also raises the internal edge temperature of the glass, which is where you usually see condensation first on older units.
To improve noise, we use laminated glass options, different thicknesses on each pane and wider cavities where the frame will allow it. That combination lifts the Rw rating and breaks up airborne sound, so road noise and voices are noticeably dulled instead of just muffled.
Gas fills like argon or krypton are there for thermal performance, not sound; they lower the U‑value without making much odds to the Rw. The real control on condensation inside the unit is the seal. We use desiccant‑filled spacer bars and tested perimeter seals, so moisture can’t creep in and fog the cavity six years down the line.
On every job we check the manufacturer’s certification for:
- Centre‑pane U‑value
- Rw (sound reduction)
- Psi‑value at the edge spacer
That way you can see the gains on paper before the glass goes in, and your FENSA certificate number backs it up once the installation is signed off in, say, Manchester.
| Metric | Typical improvement with A‑rated units |
|---|---|
| Centre‑pane U‑value | 20–50% better than old double glazing |
| Sound Rw | 3–8 dB improvement |
| Condensation risk | Noticeably reduced on inner pane |
| Thermal bridging | Minimized at edges with warm‑edge bar |
Sizing, Styles and Finishes : Choosing for Performance and Look
Looks matter, but we size and specify every unit around thermal, acoustic and security performance first.
We start by measuring the clear opening, checking diagonals and squareness, then allowing the right fitting tolerances. From that we set stile and rail sizes so the glass area and 28mm argon-filled A-rated unit give you the U-value you’re paying for.
Style choice is based on how you use the room and what the opening has to cope with:
- Single or French casements for maximum ventilation and easy cleaning
- Sliding or tilt-and-turn where space is tight
- Bi-folds only where the opening and lintel can handle the extra weight and wind load
Frame material makes a big difference. uPVC offers good thermal performance and low maintenance. Aluminium with a proper thermal break and low-E coated units keeps heat loss down. Timber or composite frames need the right paint or stain system for the exposure, plus trickle vents and Q-LON gaskets detailed properly to stop draughts.
Finishes are specified for the actual site conditions around Manchester – powder-coated aluminium to Qualicoat standard, factory-sprayed uPVC foils, or microporous stains on timber. All are checked for colour stability and adhesion so they don’t start failing after a couple of winters.
Thresholds are chosen last so we can balance access, weather and security:
- Low aluminium threshold for step-free wheelchair access
- Fully rebated uPVC or composite for maximum weather seal
- Integrated drainage where doors open onto exposed patios
Every option still needs continuous seals, a proper thermal break and multi-point locking that meets PAS 24. On completion you get the FENSA certificate number on your paperwork so you know it’s all been fitted and signed off to regulations.
Cost, Energy Savings and Estimating Your Payback
Upfront cost, energy savings and payback all come down to the exact spec and how well the doors are fitted, not just the sticker price. When you’re comparing quotes, line them up by things like U‑value, 28mm argon‑filled A‑rated glass units, low‑E coating, thermal breaks in the frame and how the installer is dealing with airtightness around the perimeter.
To get a rough payback figure, you’re looking at the difference in U‑value between your existing doors and the new ones, the size of the glazed area they’re heating, and your local gas or electric rate. From that you can estimate how many kWh you’ll stop losing through the old doors each year and put a £ value on it. Your total install cost should include the frames, glass, ironmongery, labour, any scaffolding and proper sealing with Q‑LON gaskets and expanding foam.
Take that installed cost and divide it by the annual energy saving you’ve worked out to get a simple payback in years. For a more realistic picture, allow for future maintenance, hardware replacement and gasket changes over the life of the doors, say 20–30 years, and compare that with projected fuel prices. We always recommend you only compare products with verified test data, a FENSA certificate number on completion and clear details of the glass build‑up and frame construction, so you can judge long‑term running costs properly rather than just the upfront £ figure.
Ordering, Installation & Maintenance Checklist
Once the spec and price are agreed, the next job is making sure the ordering, fitting and future upkeep are all lined up to give you the U‑values we’ve quoted. We plan the order against supplier lead times, factory QC checks and delivery slots so your 28mm argon‑filled units and profiles land on site when the openings and scaffolding are actually ready, not three weeks early sitting in the rain.
Before anything turns up, we check structural openings, sill heights, tolerance on brick reveals and threshold levels against the made‑to‑measure sizes. On the day, the fitters on site hold current glazing and manual handling certificates, carry the right glass suckers, toe‑and‑heel gear and sealant guns, and know the fixing pattern for your profile and multi-point locking system.
During installation we keep an eye on frame plumb and level, packers, and drainage slots so any water runs out correctly. At handover we check sash operation, frame squareness, gasket seating, and that all low‑E A‑rated units are undamaged and correctly beaded from the inside for security. You get your FENSA certificate number on completion along with any manufacturer paperwork.
To keep U‑values and warranties intact, we set out a simple maintenance plan you can stick on the inside of a cupboard door:
- Annual check of Q‑LON gaskets and external sealant for gaps, cracks or draughts
- Lubricate hinges, keeps and multi‑point locks with light oil and wipe down drainage slots
- Visual check of 28mm sealed units for early signs of misting or blown seals
- Record dates and findings so any warranty claim is backed up with a clear history
Frequently Asked Questions
Do A-Rated Sealed Units Affect Wi-Fi or Mobile Signal Strength?
Yes, they can knock your Wi‑Fi and mobile signal down a bit. The A-rated 28mm sealed units with low‑e coatings, argon fill and chunky reinforced frames act a bit like a screen, so you’ll often see weaker signal right by the doors or windows. Most people fix it with a mesh extender or by moving the router or adding an external aerial.
Can Made-To-Measure Doors Be Fitted Around Existing Alarm Sensors?
Yes, we can make the new door to work around your existing alarm sensors. We’ll come out, measure up, check the detector positions and wiring, and either adjust the door profile or carefully move the sensor if needed. Everything’s tested before we leave so you don’t get false alarms and your insurer’s requirements are still met.
Are Specific Cleaning Products Harmful to the Low-Emissivity Coating?
Yes, some cleaners will damage the low-e coating. Avoid anything abrasive, cream cleaners, strong alkalis or solvent‑heavy products, as they can scratch or chemically attack the coating and affect the A-rated performance. Stick to a mild, pH-neutral glass cleaner and a soft microfibre cloth, and if you’re unsure, check the manufacturer’s care sheet for your 28mm argon-filled units.
Will Door Colour Fade Noticeably in Coastal or High-Uv Areas?
Yes, you’ll get quicker colour fade in coastal or very sunny spots because the UV and salt are harsher. Go for UV-stable, marine-grade powder coating and good topcoats, and give the doors a fresh-water wash every month or so, then a proper check-over once a year so you can recoat when the manufacturer recommends.
Are Bespoke Doors Eligible for Home Insurance Discounts or Requirements?
Yes, bespoke doors can help with home insurance, but only if they meet the insurer’s security and fire specs. Use a good multi-point locking system, certified cylinders and, where needed, FD30/FD60 fire-rated doors with proper documentation and installation certificates. Always ask your insurer in writing what they require and keep all paperwork so any discount actually gets applied.