What Is a UPVC Front Door with Side Panel?
A UPVC front door with side panel (also called a UPVC door with side window, sidelight door, or side panel combination door) is an entrance door system where the main door leaf is flanked by one or more narrow, fixed or opening glazed panels - known as side panels or sidelights. These panels sit within the same outer frame as the door, creating a wider, more impressive entrance aperture while flooding the hallway with natural light.
Unlike a standalone front door, a door-with-side-panel configuration transforms a standard 900–1,000mm doorway into a 1,200–2,400mm wide architectural feature. The side panels can be:
- Fixed glazed - non-opening, purely for light and aesthetics
- Opening casement - hinged to open for ventilation
- Decorative patterned - obscured or textured glass for privacy
- Matching solid panel - infill panel matching the door design
In 2026, UPVC remains the most popular material for front door with side panel combinations in the UK, Ireland, Northern Europe, and Australia - accounting for approximately 62% of residential entrance door installations in these markets. The reasons are straightforward: UPVC delivers excellent thermal insulation, minimal maintenance, strong security credentials, and a price point that makes it accessible across budget segments.
8 Configuration Styles for UPVC Front Doors with Side Panels
The side panel configuration you choose fundamentally shapes the appearance, functionality, and light transmission of your entrance. Here are the eight most common configurations specified in 2026:
1. Single Door + Single Side Panel (Left or Right)
The classic asymmetric configuration - a standard-width door (860–920mm) with one narrow side panel (300–450mm) to one side. This is the most common format for UK semi-detached and terraced homes.
| Specification | Value |
|---|---|
| Total width | 1,200–1,500mm |
| Door width | 860–920mm |
| Side panel width | 300–450mm |
| Typical height | 2,050–2,100mm |
| Opening type | Door opens inward or outward; side panel fixed or opening |
| Best suited for | Standard residential entrances, replacement projects |
| Price range | £650–£1,200 (supply only) |
Design tip: Specify the side panel on the hinge side of the door for a balanced visual weight. If the door is right-hand hinged, place the side panel on the right - this creates a natural visual flow when approaching the entrance.
2. Single Door + Double Side Panels (Both Sides)
A symmetrical, grand entrance format - the door centered with matching side panels on both left and right. Popular for larger detached homes, farmhouse-style properties, and commercial entrances.
| Specification | Value |
|---|---|
| Total width | 1,800–2,400mm |
| Door width | 860–920mm |
| Each side panel | 300–600mm |
| Typical height | 2,050–2,100mm |
| Opening type | Door opens; side panels typically fixed |
| Best suited for | Detached homes, commercial entrances, statement entrances |
| Price range | £950–£1,800 (supply only) |
Design tip: For double side panels, specify matching glass patterns across all three elements (door + both panels). SGL offers coordinated glazing designs where the door's decorative glass is proportionally scaled to the side panels for visual harmony.
3. Single Door + Tall Side Panel (Full-Height)
The side panel extends to the same height as the door, creating a floor-to-ceiling glazed effect. This maximizes light transmission and creates a contemporary, architectural entrance.
| Specification | Value |
|---|---|
| Total width | 1,200–1,800mm |
| Door width | 860–920mm |
| Side panel width | 300–600mm |
| Height | 2,100–2,400mm (full-height) |
| Opening type | Door opens; side panel fixed (structural) |
| Best suited for | Contemporary homes, new-builds, light-maximizing renovations |
| Price range | £800–£1,500 (supply only) |
4. Single Door + Overhead Fanlight + Side Panel
A three-element configuration combining a side panel with an overhead fanlight (transom window). This is the ultimate light-maximizing entrance format, popular in Victorian and Edwardian property renovations.
| Specification | Value |
|---|---|
| Total width | 1,200–1,800mm |
| Total height | 2,400–2,700mm |
| Door | 860–920mm × 2,050mm |
| Side panel | 300–450mm × 2,050mm |
| Fanlight | 300–600mm high, matching total width |
| Best suited for | Period renovations, Victorian/Edwardian homes, maximum light |
| Price range | £1,100–£2,000 (supply only) |
5. Double Door (French) + Single Side Panel
A pair of narrow doors (French door style) with an additional side panel. Creates an exceptionally wide opening suitable for properties where occasional wide access is needed (wheelchair, furniture delivery).
| Specification | Value |
|---|---|
| Total width | 1,800–2,400mm |
| Each door leaf | 600–800mm |
| Side panel | 300–450mm |
| Typical height | 2,050–2,100mm |
| Opening type | Both doors open; side panel fixed |
| Best suited for | Wide entrances, accessibility requirements, farmhouse style |
| Price range | £1,200–£2,200 (supply only) |
6. Single Door + Side Panel with Opening Vent
The side panel includes a top-hung or side-hung opening vent within the fixed frame - providing ventilation without compromising security or opening the main door.
| Specification | Value |
|---|---|
| Total width | 1,200–1,500mm |
| Door width | 860–920mm |
| Side panel | 300–450mm with integrated vent (150–300mm opening) |
| Vent type | Top-hung or side-hung casement |
| Best suited for | Homes requiring hallway ventilation, security-conscious properties |
| Price range | £750–£1,350 (supply only) |
7. Single Door + Decorative Side Panel with Patterned Glass
The side panel features decorative obscured glass - providing privacy while allowing diffused light. Patterns include floral, geometric, Art Deco, and custom designs.
| Specification | Value |
|---|---|
| Total width | 1,200–1,500mm |
| Glass type | Patterned/obscured (privacy rating 1–5) |
| Pattern options | 30+ standard designs; custom available |
| Best suited for | Privacy-conscious properties, traditional aesthetics, street-facing entrances |
| Price range | £700–£1,300 (supply only) |
8. Single Door + Side Panel with Integral Blinds
The side panel incorporates Venetian or pleated blinds sealed between the glass panes - offering privacy and light control without external fittings that require cleaning.
| Specification | Value |
|---|---|
| Total width | 1,200–1,500mm |
| Blind type | Venetian (aluminum slats) or pleated fabric |
| Operation | Manual (magnetic) or motorized |
| Best suited for | Modern homes, low-maintenance requirements, precise light control |
| Price range | £950–£1,600 (supply only) |
UPVC Front Door with Side Panel: Technical Specifications
Frame Construction
SGL's UPVC front door with side panel systems use a multi-chamber profile construction - typically 5 or 6 internal chambers that create thermal breaks and structural rigidity:
| Component | Specification |
|---|---|
| Profile material | Unplasticized PVC (uPVC), lead-free formulation |
| Wall thickness | 2.5–3.0mm (outer walls); 1.8–2.2mm (chamber walls) |
| Chamber count | 5 or 6 chambers (thermal and acoustic insulation) |
| Steel reinforcement | Galvanized steel inserts in outer frame and door leaf |
| Frame depth | 70mm (standard) or 80mm (enhanced thermal) |
| Gasket system | Dual EPDM compression seal (inner + outer) |
Glazing Options
| Glazing Type | U-Value | Security | Acoustic | Privacy | Best For |
|---|---|---|---|---|---|
| 4/16/4 double clear | 1.4 W/m²K | Standard | Standard | None | Maximum light |
| 4/16/4 double Low-E | 1.1 W/m²K | Standard | Standard | None | Energy efficiency |
| 6.4mm laminated | 1.4 W/m²K | Enhanced (anti-break) | Good | None | Security priority |
| 4/12/4/12/4 triple | 0.8 W/m²K | Standard | Very good | None | Extreme climates |
| Patterned/obscured | 1.4 W/m²K | Standard | Standard | Privacy rated | Street-facing |
| Integral blinds | 1.2 W/m²K | Standard | Standard | Adjustable | Modern homes |
Security Specifications
A front door with side panel is only as secure as its weakest element. SGL specifies the following minimum security standards:
| Element | Minimum Specification | Enhanced Specification |
|---|---|---|
| Door lock | 3-point espagnolette | 5-point multi-lock with deadbolt |
| Door cylinder | BS EN 1303:2005 Grade 3 | TS007 3-Star anti-snap |
| Door hinges | 3× adjustable flag hinges | 3× security hinges with anti-lift pins |
| Side panel glazing | Laminated or toughened | Laminated security glass |
| Frame fixings | 8× frame screws into masonry | 12× security fixings with expanding anchors |
| Letter plate | None (or sealed internal brush) | Security letter plate with restrictor |
| Door viewer | 180° wide-angle | 200° digital door viewer |
Security tip: Side panels are often the weakest security point. Always specify laminated glass (not just toughened) for side panels - laminated glass holds together when shattered, preventing the "smash and reach" attack method.
Energy Efficiency & Building Regulations
U-Value Requirements by Region (2026)
| Region | Maximum U-Value for Replacement Doors | Maximum U-Value for New Build |
|---|---|---|
| England & Wales (Building Regs Part L) | 1.8 W/m²K | 1.4 W/m²K |
| Scotland (Section 6) | 1.8 W/m²K | 1.2 W/m²K |
| Northern Ireland (Part F) | 1.8 W/m²K | 1.4 W/m²K |
| Republic of Ireland (Part L) | 1.6 W/m²K | 1.2 W/m²K |
| Australia (NCC Section J) | N/A | 2.5 W/m²K (varies by climate zone) |
SGL UPVC Door + Side Panel Performance
| Configuration | U-Value | Energy Rating | Compliance |
|---|---|---|---|
| Standard 70mm frame + double clear | 1.6 W/m²K | C | England/Wales replacement compliant |
| 70mm frame + double Low-E | 1.3 W/m²K | B | All UK replacement + new build compliant |
| 80mm frame + double Low-E | 1.1 W/m²K | A | Scotland/Ireland new build compliant |
| 80mm frame + triple glazed | 0.9 W/m²K | A+ | Passivhaus-ready |
Sizing Guide: How to Measure for a UPVC Front Door with Side Panel
Accurate measurement is critical - a door with side panel is a custom-manufactured product with typically 4–6 week lead time. Incorrect measurements result in costly delays and remedial work.
What to Measure
| Measurement | How to Measure | Tolerance |
|---|---|---|
| Structural opening width | Brick-to-brick at top, middle, and bottom. Record the narrowest measurement. | -5mm for frame fit |
| Structural opening height | Brick-to-brick or lintel-to-sill at left, center, and right. Record the narrowest. | -5mm for frame fit |
| Wall depth | External face to internal face of wall. Determines frame depth and cill specification. | Exact |
| Floor level | Finished internal floor to finished external threshold level. Determines cill height and threshold type. | Exact |
Configuration Decision Checklist
Before ordering, confirm:
- Door handing: Left-hand or right-hand hinge? (Viewed from outside)
- Opening direction: Inward or outward opening?
- Side panel position: Left, right, or both sides?
- Side panel width: 300mm, 400mm, 450mm, or 600mm?
- Side panel type: Fixed, opening vent, or decorative glass?
- Glass specification: Clear, Low-E, laminated, patterned, or integral blinds?
- Color: Standard or premium finish? Same color both sides?
- Hardware: Standard or security upgrade (3-star cylinder, multi-point lock)?
- Threshold: Low threshold (wheelchair access) or standard rebated threshold?
- Fanlight required: Yes/no - and if yes, what height?
Price Guide 2026
Supply-Only Pricing (Excluding Installation)
| Configuration | Standard Spec | Enhanced Spec | Premium Spec |
|---|---|---|---|
| Single door + single side panel (fixed) | £650–£850 | £850–£1,100 | £1,100–£1,400 |
| Single door + single side panel (opening vent) | £750–£950 | £950–£1,200 | £1,200–£1,500 |
| Single door + double side panels | £950–£1,250 | £1,250–£1,600 | £1,600–£2,000 |
| Single door + side panel + fanlight | £1,100–£1,450 | £1,450–£1,850 | £1,850–£2,300 |
| Double door + single side panel | £1,200–£1,600 | £1,600–£2,000 | £2,000–£2,500 |
Price factors:
- Size: Non-standard dimensions add 10–20%
- Color: Premium colors add 15–25%; dual-color (different inside/outside) adds 20–30%
- Glass: Laminated adds 15%; integral blinds add 25–40%; triple glazing adds 20–30%
- Hardware: Security upgrade (3-star cylinder + multi-point) adds £80–£150
- Delivery: Standard 4–6 weeks; express 2–3 weeks adds 15–20%
Installation Overview
A UPVC front door with side panel is a replacement-friendly installation - typically completed in a single day by a two-person team. The process:
- Remove existing door and frame - carefully preserving surrounding masonry and plaster
- Prepare opening - check level, plumb, and square; install damp-proof course (DPC) if required
- Position new frame - frame assembled with door and side panel(s) pre-hung
- Level and fix - pack and shim to achieve plumb; fix through frame into masonry
- Seal perimeter - apply expanding foam between frame and masonry; trim excess
- Install trim/architrave - internal and external trim to cover frame edge
- Hardware adjustment - check lock operation, hinge alignment, compression seals
- Clean and handover - remove protective film, clean glass, demonstrate operation
Installation tip: For properties with existing side panels being replaced, verify the structural opening is square before ordering. Older properties often have openings that are out of square by 10–20mm - SGL can manufacture frames with adjustable packers to accommodate, but this must be specified at order stage.
FAQ
Q: Q: What is the difference between a side panel and a sidelight?
A: A: In practice, the terms are used interchangeably in the UK and Ireland. Technically, a "sidelight" typically refers to a narrow glazed panel beside a door, while "side panel" can refer to either glazed or solid infill panels. When ordering, specify whether you want glazed, solid, or opening functionality.
Q: Q: Can I add a side panel to my existing front door?
A: A: Generally no - a door with side panel requires a dedicated wider frame designed to accommodate both elements. The structural opening must be widened (if masonry allows), and a complete new door-set with integrated side panel must be installed. Retrofitting a side panel to an existing single-door frame is not structurally feasible.
Q: Q: Are UPVC front doors with side panels secure?
A: A: Yes - when specified correctly. The critical security elements are: (1) multi-point locking on the door (3-point minimum, 5-point recommended), (2) TS007 3-star anti-snap cylinder, (3) laminated glass in the side panel (not just toughened), (4) security hinges with anti-lift pins, and (5) adequate frame fixings into masonry. SGL's security-specified configurations meet PAS 24:2022 and Secured by Design requirements.
Q: Q: How much does a UPVC front door with side panel cost?
A: A: In 2026, a standard UPVC front door with single side panel costs £650–£1,400 supply-only, depending on size, color, glass specification, and hardware. Double side panel configurations range from £950–£2,000. Installation typically adds £400–£700. For an all-in supply and fit price, budget £1,200–£2,500 depending on specification.
Q: Q: Do I need planning permission to install a front door with side panel?
A: A: In most cases, no - replacing an existing door with a door-plus-side-panel combination falls under permitted development in the UK, provided the overall appearance is not materially altered (e.g., no significant increase in glazing area in a conservation area). However, if you live in a listed building or conservation area, consult your local planning authority. In new openings or extensions, building regulations approval is required.
Q: Q: Can the side panel open for ventilation?
A: A: Yes - SGL offers side panels with integrated opening vents (top-hung or side-hung casement vents within the fixed frame). This provides secure ventilation without opening the main door. Alternatively, the entire side panel can be specified as an opening casement, though this is less common due to the security and weather-sealing complexity.
Q: Q: What colors are available for UPVC front doors with side panels?
A: A: SGL offers 8 standard colors at no premium (White, Cream, Black, Anthracite Grey, Chartwell Green, Irish Oak, Golden Oak, Rosewood) and 6 premium colors with 15–25% surcharge. Dual-color options (different color inside and outside) are also available. All colors are through-profile, not surface coating.
Q: Q: How long does it take to manufacture and deliver a UPVC front door with side panel?
A: A: Standard lead time is 4–6 weeks from confirmed order and measurement. Express manufacturing (2–3 weeks) is available with a 15–20% surcharge. Installation is typically completed in one day. SGL provides confirmed delivery dates at order confirmation and updates throughout production.
Q: Q: What is the energy rating of a UPVC front door with side panel?
A: A: SGL's standard 70mm frame with double Low-E glazing achieves a U-value of 1.3 W/m²K and an energy rating of B - compliant with all UK and Ireland building regulations for both replacement and new-build applications. The 80mm frame with triple glazing achieves 0.9 W/m²K and A+ rating, suitable for Passivhaus and ultra-low-energy projects.
Q: Q: Can I have different glass in the door and side panel?
A: A: Yes - this is common. Many customers specify clear or decorative glass in the door (for visibility and design) with obscured or patterned glass in the side panel (for privacy). SGL can mix glass types within the same frame, provided the glass thicknesses are compatible with the bead profiles.
Conclusion
A UPVC front door with side panel is one of the most impactful upgrades you can make to a property entrance - transforming a narrow, dark doorway into a wide, light-filled architectural feature. The key to a successful specification is understanding the configuration options (single vs. double side panel, fixed vs. opening, standard vs. full-height), selecting the right glazing for your privacy and security needs, and ensuring the thermal and security specifications meet your local building regulations.
SGL manufactures UPVC front doors with side panels in all standard and custom configurations, with 8 standard colors, 30+ glass options, and security specifications from standard residential through to PAS 24 and Secured by Design certification. Our technical team provides measurement guidance, specification support, and installation coordination for projects across the UK, Ireland, and export markets.
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