Bifold Door Costs UK — What to Charge for Bifold Door Supply and Fit in 2026

Bifold doors are one of the highest-value domestic installation jobs available to a glazier or builder. A single rear-elevation bifold installation — supply, structural works, and fit — can invoice between £4,000 and £12,000 depending on material, configuration, and what structural alterations are required. But the range is wide enough that pricing without a clear framework will either lose you the job or erode your margin. This guide covers 2026 supply and fit prices across all four main frame materials, the configuration and glazing options that move the price, what structural work is needed, building regulations compliance, and the upsells that turn a good bifold job into an exceptional one.

Bifold Door Costs by Frame Material (Supply & Fit, 2026)

The prices below are fully installed supply-and-fit costs to the homeowner, covering the door system, standard double glazing, a traffic door, standard threshold, and two fitters for one to two days. Structural works (steel beam, temporary support) and making good (plastering, rendering, decorating) are excluded — see separate sections below.

Prices are indicative 2026 figures for the UK. London and South East installs typically sit at the upper end of each range. Scotland and Northern England generally sit 10–15% lower.

uPVC bifold doors

uPVC is the most affordable bifold option and the right choice where budget is the primary consideration. It is lower maintenance than timber, thermally efficient when properly specified, and available in a wide range of colours via foiling. The limitation is structural: uPVC profiles are bulkier than aluminium and the sightlines (the visible frame width between panels when open) are wider. For customers who want the slimmest possible frame and the most glass, uPVC is not the right recommendation.

Powder-coated aluminium

Standard powder-coated aluminium offers slim sightlines, a wide RAL colour range, and good durability without the cost premium of thermally broken systems. The thermal performance is lower than thermally broken aluminium — standard aluminium conducts heat through the frame, which can cause condensation on the frame face in cold weather. For most rear-elevation installations on a standard extension in a temperate UK climate, this is an acceptable trade-off at the mid-range price point. It is not acceptable for north-facing openings or highly insulated buildings targeting EPC Band B or above.

Thermally broken aluminium

Thermally broken systems — Reynaers CP 68, Schüco ASS 70.HI, and similar — incorporate a polyamide thermal break within the frame profile that interrupts the conductive aluminium path. This dramatically improves the whole-unit U-value and eliminates the cold-frame condensation issue. These systems also tend to have better hardware tolerances and longer hardware warranties. They are the correct specification for high-end renovations, passive house builds, and any installation where the customer is investing in triple glazing or specialist solar control glass.

Timber (oak and hardwood)

Timber bifolds are the premium option and suit listed buildings, conservation area properties, and high-specification renovations where the warmth and natural variation of wood is part of the design intent. Oak is the most commonly specified hardwood; accoya (modified radiata pine with a 50-year guarantee against rot) is increasingly used as a lower-maintenance alternative with similar aesthetics. Timber requires maintenance — oiling or painting every five to seven years depending on exposure — and lead times are long. Quote timber bifolds with a separate maintenance plan conversation; it is a natural upsell into an annual service contract.

Configuration Options: Traffic Door, Fold Direction, and Threshold

Traffic door

Every bifold installation includes a traffic door — a panel that opens independently as a standard hinged door without folding the full system. This is standard and included in all quoted prices above. It allows day-to-day access without unfolding the entire door. The traffic door is typically the panel closest to the internal access route; confirm with the customer at survey which end of the opening they want it on.

Fold direction

Bifolds can be configured to fold in three ways, and you need to confirm this at survey — it affects the door system order and cannot be changed after manufacture:

• Left-folding (all panels stack to the left): The most common configuration on 3-panel systems. All panels concertina and stack against the left-hand reveal. Maximum clear opening on the right side of the aperture. No additional cost.
• Right-folding (all panels stack to the right): Mirror of the above. No additional cost. The choice between left and right folding is purely determined by where the customer wants the stacked panels and where the patio or garden area is best accessed.
• Both folding to centre (split configuration): Panels fold from both ends and stack at the centre of the opening, or split evenly towards each reveal. This is common on wider 4- and 5-panel systems and gives a symmetrical opening. The split point and traffic door configuration must be confirmed carefully. No material cost uplift, but adds approximately 30–60 minutes of survey and installation time to confirm alignment correctly across the meeting post.

Threshold options

The threshold is one of the most practically important decisions in a bifold installation and should be discussed explicitly at survey, not left for the customer to discover post-installation:

• Standard rebated threshold (included in base price): A small upstand — typically 15–20 mm — at floor level. Water-tight and structurally straightforward. The standard specification on most systems.
• Low-profile threshold (+£0–£200): A reduced upstand of 5–8 mm. Often included as standard on better aluminium systems. Improves the visual connection between inside and outside and reduces the trip hazard. Some customers specifically request this; it should be offered as a default on all aluminium installations.
• Flush / zero-threshold (+£300–£600): The floor and threshold are at the same level, creating a seamless transition from internal flooring to patio. This is the premium option and requires more precise installation — the sub-floor construction must accommodate the drainage channel that sits beneath the threshold to prevent water ingress. Flush thresholds also require Part M accessibility compliance to be confirmed if the property is being modified for disabled access. Price the flush threshold as a named line item and explain the drainage requirement; homeowners who select it without understanding the drainage work often raise complaints when they see the groundworks involved.

Glazing Options and Cost Uplifts

Standard double glazing (4/16/4 argon-filled with low-E coating, Uw around 1.2–1.4 W/m²K) is included in all base prices above and meets the Building Regulations Part L minimum of Uw ≤ 1.6 W/m²K for doors. The upgrades below are priced per door system (not per panel) as addenda to the base installation price:

Offer glazing upgrades as a menu at survey, not as an afterthought. Solar control glass in particular is a strong upsell on south-facing rear extensions — without it, a large glazed opening on a south elevation can make a kitchen or dining room uncomfortably hot in summer. Customers who discover this problem post-installation and connect it back to the door specification will not be satisfied customers. Surfacing it at survey and offering the upgrade demonstrates expertise and avoids a post-install complaint.

Structural Opening Requirements: Steel Beams and Temporary Support

Most bifold door openings require structural support above the aperture. In a masonry wall, once you remove a section wider than approximately 900 mm, you need a lintel or structural steel beam (RSJ or parallel flange channel) to carry the load of the wall and structure above. This is almost always required on bifold installations, where openings are typically 2.4–6 m wide.

Beam supply and installation costs

For any opening over 3.5 m, the beam size must be designed by a qualified structural engineer. Do not size the beam yourself based on experience or rule of thumb — the loading from a two-storey wall or a roof structure bearing on a wide opening is non-trivial, and an undersized beam is a structural failure risk. A structural engineer's calculation for a typical domestic opening costs £200–£500 and takes one to two weeks. This should be confirmed before the door system is ordered, as the beam pocket dimensions in the masonry need to match the beam specification.

During beam installation, temporary Acrow props and a spreader board are required to carry the wall load while the beam is lifted into position. The temporary support must extend at least 600 mm either side of the proposed opening and must bear on a solid floor or be adequately spread over a suspended floor. Factor this into your installation programme: propping up, cutting the opening, installing the beam, and allowing the padstone bed mortar to cure typically takes one full working day before the bifold frame can be installed.

Quote beam work as a separate named line item. Customers who receive a single lump-sum price for “bifold doors installed” are often confused when they discover that a significant portion of the cost is structural rather than the door itself. Itemising the beam, temporary support, padstones, and making good separately gives the customer a clear breakdown and makes your quote far easier to justify.

Installation Labour: What's Included and What to Exclude

A standard bifold door installation requires two fitters for one to two days. Day one typically covers the structural opening preparation and beam installation (if not already done by the main contractor), frame fitting, and door hanging. Day two covers alignment, hardware adjustment, threshold sealing, and snagging. The frame must be perfectly plumb and level — bifold hardware has limited adjustment tolerance, and a frame installed out of square will cause the doors to bind or fail to seal correctly.

Access and scaffold

Ground-floor rear-elevation bifold installations are typically accessible from both inside and outside at ground level. No scaffold is needed. Where the installation is above ground floor — for example on a raised-floor extension or a first-floor Juliet balcony conversion — external scaffold or a mobile elevating work platform (MEWP) will be required. Price this separately: scaffold hire for a typical domestic elevation runs £400–£900 per week for access scaffolding, or £150–£300 per day for a MEWP hire.

Making good

The area around the frame — internal reveals, external masonry, and the zone above where the beam was installed — will require making good after the bifold is fitted. This work is almost always excluded from a glazing contractor's price and should be explicitly stated in your quote. Making good costs to communicate to the customer (supplied separately by a plasterer, decorator, or the main contractor) are:

• Internal reveal skim and first fix: £200–£500 depending on extent
• External rendering around frame (if rendered elevation): £150–£400
• Decoration (first and second coat around reveals): £150–£300

In total, customers should budget £400–£1,200 for making good around a bifold opening separately from the door supply-and-fit price. State this figure in your quote so it is not a surprise and does not come back as a dispute about what your price “should have included.”

Building Regulations for Bifold Door Installations

Bifold door installations in England and Wales are notifiable work under Building Regulations. The key approved documents that apply are:

Part L — Energy efficiency

Replacement and new door installations must meet a whole-unit U-value (Uw) of ≤ 1.6 W/m²K. In practice, a well-specified double-glazed unit with a thermally broken frame will achieve 1.0–1.4 W/m²K. Confirm the Uw value from your supplier's technical data sheet and include it on your quote documentation. If you are registered with FENSA or Certass, you can self-certify Part L compliance. If not, a building control application is required.

Part N — Safety glazing

All glazing in critical locations — glazing in doors and glazing within 300 mm of a door edge, glazing within 800 mm of floor level — must be safety glazing. For bifold doors, this means all panels must be either toughened (tempered) glass or laminated safety glass. Standard toughened glass is the normal specification and is included in all well-specified bifold systems. Confirm this with your supplier and document it on your quote. Annealed (ordinary float) glass in a bifold door is a Building Regulations non-compliance and a serious safety risk.

Planning permission

Installing bifold doors in an existing rear wall opening, or as part of a rear single-storey extension, does not normally require planning permission under Permitted Development Rights for dwellinghouses. However, planning permission is required in the following cases:

• The property is a listed building — Listed Building Consent is required for any alterations affecting the character of the building.
• The property is in a conservation area — some conservation area conditions restrict the material and design of new openings, particularly on front and side elevations.
• The property is a flat or maisonette — Permitted Development Rights for flats are more restricted than for houses.
• The householder's Permitted Development Rights have been removed by an Article 4 Direction — check with the local planning authority if the customer is uncertain.

Make it a standard part of your survey process to ask the customer whether the property is listed or in a conservation area. If there is any uncertainty, recommend they check with their local planning authority before ordering the door system.

Lead Times: When to Order and What to Tell Customers

Bifold door lead times are one of the most common sources of customer frustration on extension and renovation projects. Customers who do not understand the lead time will pressure for installation before the door is ready, or will start structural work before the door is confirmed and then discover the opening dimensions do not match what was ordered.

The practical advice for managing lead times on a building project: the door should be ordered before structural work starts, not after. If the opening is formed and the beam is installed before the door is ordered, the structural contractor will not wait six to ten weeks for glazing — they will move to the next job, leaving the opening boarded up and the project stalled. Order the door at deposit stage, confirm exact aperture sizes with the structural contractor before ordering, and build the lead time into the project programme.

Upsells: What to Offer on Every Bifold Door Job

A bifold door enquiry is the highest-value entry point into a customer's home improvement project. The homeowner is spending thousands on a structural opening — the marginal cost of adding adjacent products is low and the margin on upsells is strong. These are the upsells worth offering on every bifold installation:

Matching sidelights (+£500–£1,500 each)

Fixed glazed panels either side of the bifold frame that extend the glass line into the reveal. These dramatically improve the visual result — particularly on wider openings where the reveals would otherwise be solid masonry — and are a natural pairing with a premium aluminium or timber bifold. The sidelight frames are typically ordered from the same manufacturer as the bifold to ensure profile and colour consistency. Price each sidelight as a separate line item: a single sidelight in aluminium with standard double glazing typically adds £500–£900; a pair of tall sidelights in thermally broken aluminium with solar control glass can reach £2,500–£3,000 combined.

Roof lantern above (+£2,500–£6,000)

Where the bifold opens onto a flat-roof single-storey extension, a roof lantern above the extension roof brings natural light into what would otherwise be a dark interior. Aluminium thermally broken roof lanterns in standard sizes (1.5 m × 2.5 m is a common domestic size) supply and fit for £2,500–£4,000. Bespoke sizes and heritage-style lanterns (often specified to satisfy conservation area conditions) run £4,000–£6,000+. Roof lanterns are a strong upsell because they are naturally raised at the same time as the bifold — the structural and access work is already being done, and the disruption to the homeowner of having both done together is far less than returning for a second installation.

Integrated blinds (+£400–£1,200)

Integral blinds — pleated or Venetian blinds sealed inside the sealed unit cavity — eliminate the dust, cord, and maintenance issues of traditional external blinds and are a popular addition on south- or west-facing openings. They are operated by a small magnet on the external face of the glass, with no mechanical penetration of the sealed unit. Price the upgrade per panel: a full 4-panel bifold with integral blinds in all panels adds £400–£1,200 depending on the blind type and supplier. This is a strong upsell on solar-facing installations, particularly when paired with the solar control glass upgrade.

Flush threshold upgrade (+£300–£600)

As covered in the configuration section, the flush threshold is the premium choice for a seamless indoor-to-outdoor connection. If you have quoted a standard or low-profile threshold in the base price, always present the flush threshold as a named upgrade. Customers who are spending £5,000–£10,000 on a bifold system will often spend an extra £400 for the aesthetic result — particularly if the internal flooring will continue seamlessly onto the patio in large-format porcelain or stone tiles.

Dual-colour frame uplift (+£200–£400)

A white or grey internal face with a different external colour — typically anthracite grey, black, or a bespoke RAL externally — is a very popular finish choice on aluminium bifolds. It satisfies the desire for a contemporary external appearance while keeping the internal face neutral. The uplift is modest relative to the overall job value: £200–£400 for dual-colour versus single-colour on a mid-range aluminium system. Present it as a standard question at survey: “Would you like the same colour inside and out, or a different finish internally?”

Annual service contract (+£80–£150/year)

Bifold doors require periodic maintenance — hardware lubrication, roller adjustment, seal inspection, and threshold drainage channel clearing. Offering an annual service contract at point of installation creates a recurring revenue stream and keeps you in front of the customer for future work. A simple annual visit covering hardware check, lubrication, and adjustment takes approximately an hour and is worth pricing at £80–£150 per year depending on system complexity. Present it as part of the handover conversation, not as an afterthought: “We offer an annual maintenance visit to keep the hardware operating correctly and the warranty valid — would you like to add that to your package today?”

Tracking Which Channels Drive Your Bifold Door Enquiries

Bifold door jobs are high-value and relatively low-volume — most glazing businesses install far fewer bifold systems than windows or patio doors. That makes it particularly important to know which marketing channels are generating bifold enquiries, because each one represents a significant revenue opportunity and you want to allocate your marketing spend towards the channels that reliably produce them.

The channels most commonly cited by glaziers as producing bifold enquiries are: Google search ads (homeowners actively searching for bifold quotes), Google Business Profile (local search with reviews), and homebuilder referrals from architects or main contractors. Checkatrade and Rated People tend to generate lower-value window and door repair enquiries rather than high-value bifold supply-and-fit jobs — but this varies significantly by area and business type.

The only way to know which channels produce your best bifold jobs is to record the enquiry source at the point of first contact, track it through to invoice value, and review it quarterly. Trade2Base records enquiry source against job value so you can see exactly which channels are producing bifold door contracts versus smaller repair enquiries — and make informed decisions about where to invest your marketing budget next quarter.