Central Spine Staircase — UK Price Guide
Central Spine Staircase Cost UK — From £10,999
One transparent price covering everything from first survey to final installation. Solid Grade A European Oak treads, certified glass balustrade, structural calculations, 3D design, RAL-finished steel and integrated LED pre-wiring — all included as standard. No add-ons. No hidden extras.
A central spine staircase is one of the most architecturally striking features in modern UK homes — a single structural steel beam runs up the centre, with each tread cantilevering out from both sides to create a floating, open appearance with no visible side supports. Continox manufactures bespoke central spine staircases from £10,999 excl. VAT, with everything included as standard: design, structural engineering, premium materials, in-house manufacture and professional installation across the UK.
This guide covers exactly what's included in the base price, what affects the final cost, and typical pricing for the most common configurations. All figures are fixed-price following a free on-site survey — never an estimate based on a phone call.
What's Included in the £10,999 Price
Most staircase suppliers quote a "from" price that doesn't include design, structural calculations, materials or installation. Our base price covers all of it. Compare like-for-like and the £10,999 figure represents £5,500+ in services that competitors charge as extras — design and engineering alone are worth around £3,000, professional installation around £2,500.
On-site survey & 3D photorealistic design
Free site visit with precise measurements and structural assessment, followed by detailed 3D visuals showing exactly how your staircase will look in your space — before manufacture begins.
Certified structural calculations
Full engineering calculations to BS EN 1991-1-1 and BS 6180:2011, with Building Control documentation and engineer's certification — included as standard, not charged as an extra.
Single-spine beam with cantilever brackets
Precision-engineered structural steel spine with hidden cantilever brackets supporting each tread. Powder-coated in any RAL colour matched to your interior — black, white, anthracite or custom.
Grade A European Oak treads
First-class solid European Oak — the highest grade available, hand-selected for grain consistency. Typically 50–80mm thick to span the full width without deflection. Up to 30+ stain and lacquer finishes.
Certified toughened glass balustrade
Toughened safety glass to BS EN 12150 and BS 6180:2011 with stainless steel point-fix brackets. Solid oak handrail laser-levelled and continuously fitted from bottom to top of the staircase.
Pre-wired for integrated LED lighting
The steel structure and treads are fully prepared at manufacture for seamless under-tread LED integration — no retrofitting required when you're ready to add lighting later.
Professional installation by our team
Fitted by our experienced in-house team — typically completed in 2–3 days. All structural fixings engineered to your specific floor and wall construction. Clean, respectful, on schedule.
Delivery to site & all fixings
Delivery to your address with all components, fixings and installation hardware. No coordinating with multiple suppliers — one company, one point of accountability from design through to handover.
Base price covers: straight-flight central spine staircase, 900mm wide, up to 13 risers, glass balustrade on one side. Indicative for a typical UK residential project. Additional costs apply for L-shape and U-shape configurations, wider treads, double-sided balustrades and platform landings — full breakdown below.
What Affects the Final Cost?
The base price covers a standard straight flight with the most common specification. Here's exactly how each additional feature affects the final price of your central spine staircase — every figure is transparent, with no surprise extras at the survey stage.
Staircase shape & turns
The number of turns significantly affects the cost — each turn requires additional structural engineering, more steel and longer installation. The base price covers a straight flight.
Tread width
Standard tread width in our base package is 900mm. Wider treads require more solid Grade A oak and additional manufacturing time. Pricing applies per 100mm increment above 900mm.
Glass balustrade upgrades
Base price includes 12mm toughened glass on one side of the staircase. Upgrading to both sides, frameless landing balustrade or thicker glass adds to the total — priced per linear metre.
Platforms & landings
Platforms and landings use significant material and require precise engineering to integrate with the central spine structure. Priced per square metre, with custom dimensions on request.
Integrated LED lighting
The structure is pre-wired for LED at no extra cost — only the LED hardware and installation adds to the price. Compatible with Philips HUE for app-controlled colour, intensity and motion-sensor activation.
Site complexity
Standard installation is included as part of the base price. For projects requiring structural alterations, scaffold access or removal of an existing staircase, additional costs may apply — confirmed at survey stage.
Example: L-Shape, 1000mm Treads, Glass Both Sides
A realistic worked example showing how a typical upgraded central spine staircase comes together — the most common specification we install across South England.
All prices excl. VAT. Indicative for a typical L-shape installation up to 2700mm floor-to-floor height. Final price confirmed following free on-site survey and detailed 3D design consultation. Lead time 6–8 weeks from order to installation.
Why Central Spine Staircases Cost More Than Standard Designs
The higher cost of a central spine staircase versus a standard one reflects the engineering complexity involved. A standard staircase uses two side stringers to support the treads — a relatively simple and material-efficient structure. A central spine design concentrates the entire load of the staircase onto a single steel beam, which must be precisely engineered, welded and fixed to handle both static and dynamic loads from everyday use.
The Grade A European Oak treads used in a central spine staircase are also significantly thicker than those in a standard design — typically 50–80mm solid timber — to span the full width without deflection. Combined with the certified structural glass balustrade, full Building Control documentation and specialist installation requirements, this explains why a complete bespoke central spine staircase starts from £10,999 fully installed.
- Structural steel spine — precision-engineered to bespoke geometry, not standard sections from a catalogue
- 50–80mm solid Grade A oak treads — substantially thicker than standard, cantilevered both sides
- 12mm+ toughened safety glass — BS EN 12150 and BS 6180:2011 certified balustrade
- Specialist installation — 2–3 days on site by trained in-house fitters, no subcontractors
- 3D design service — visualise materials, finishes and proportions before manufacture, included free
- Building Control documentation — Part K compliance, structural calculations and Declaration of Performance, all included
Central Spine Staircase Price Guide — Common Configurations
Indicative prices for the most popular central spine specifications. All include design, manufacture & installation.
| Straight Flight | ||
| Straight flight Most Popular | 900mm treads · glass one side · oak handrail · up to 13 risers | From £10,999 |
| Straight flight — wide tread | 1000mm treads · glass one side · oak handrail | From £11,949 |
| Straight flight — glass both sides | 900mm treads · glass both sides · oak handrail | From £12,399 |
| L-Shape & U-Shape | ||
| L-shape (1 turn) | 900mm treads · glass one side · oak handrail | From £12,499 |
| L-shape — 1000mm + glass both sides | 1000mm treads · glass both sides · oak handrail | From £14,849 |
| U-shape (2 turns) | 900mm treads · glass one side · oak handrail | From £13,999 |
| U-shape — glass both sides | 900mm treads · glass both sides · oak handrail | From £15,399 |
| Popular Upgrades | ||
| Under-tread LED lighting | Hardware per straight flight (pre-wiring included) | From +£1,500 |
| Platform landing | 1m × 1m solid oak platform | +£1,800 |
| 17.5mm frameless glass | Upgrade from 12mm — per linear metre | +£750/m |
| Fully bespoke design | Any layout, any material, any finish | From £12,500 |
Central Spine Staircase Cost FAQ
How much does a central spine staircase cost in the UK?
A bespoke central spine staircase from Continox starts at £10,999 excl. VAT for a straight flight, including Grade A solid oak treads, 12mm toughened glass balustrade on one side, oak handrail, RAL-finished steel spine, structural calculations, 3D design and full professional installation. Final cost depends on turns, tread width and balustrade specification. A typical L-shape with 1000mm treads and glass on both sides comes in at approximately £14,500–£15,500 fully installed.
Why is the Continox price higher than other quotes I've seen?
Most "from £6,000" or "from £8,000" quotes you'll see online are supply-only — they exclude the on-site survey, 3D design, structural calculations, Building Control documentation and installation. By the time you've paid for those separately, the real cost is usually £12,000–£16,000. Our £10,999 figure includes all of it as standard. Compare like-for-like and we're consistently the most transparent and competitive option in the UK premium segment.
What is a central spine staircase?
A central spine staircase (also known as a mono-stringer staircase) uses a single structural steel beam running up the centre, with each tread cantilevering out from both sides. This creates a floating, open appearance with no visible side supports — one of the most architecturally striking staircase designs available. Ideal for open-plan homes, new builds and double-height entrances where the staircase becomes the architectural centrepiece of the space.
Does the £10,999 price include installation?
Yes — all Continox prices include professional installation by our in-house team as standard (worth approximately £2,500). Unlike suppliers who sell DIY kits or supply-only packages, we manage the entire project from design through to handover. Installation typically takes 2–3 days on site for a standard straight flight, with all structural fixings engineered to your specific floor and wall construction.
What exactly is included in the £10,999 base price?
The base price includes: straight flight up to 2700mm height (max 13 risers), Grade A solid European Oak treads at 900mm width, 12mm toughened glass balustrade on one side (BS EN 12150), solid oak handrail, powder-coated steel spine in any RAL colour, certified structural calculations (worth £3,000+), full 3D design service with photorealistic visuals, pre-wiring for integrated LED lighting, delivery to site and professional installation (worth £2,500+). Additional costs apply for turns, wider treads, double-sided glass, LED hardware and landings.
How much does an L-shape central spine staircase cost?
An L-shape (1 turn) central spine staircase starts from approximately £12,499 — the £10,999 base plus £1,500 for the additional turn. With 1000mm treads and glass on both sides, expect approximately £14,500–£15,500 fully installed. All prices excl. VAT, confirmed at fixed price after free on-site survey.
How long from order to installed staircase?
Continox typically delivers within 6–8 weeks from order to completed installation. This covers design consultation and 3D visuals (Weeks 1–2), manufacturing in our workshop (Weeks 3–7), and on-site installation (2–3 days). Complex bespoke designs with multiple turns or oversized landings may take slightly longer — confirmed at order stage.
Can I see the design before manufacture begins?
Yes — Continox provides detailed 3D photorealistic visualisations of your staircase placed accurately within your space before any manufacture begins. You'll see materials, tread finish, balustrade style, RAL colour and lighting exactly as they'll appear when installed. This is included as standard at no extra cost — and you only commit to manufacture once the design is approved.
Is a central spine staircase Building Regulations compliant?
Yes — every Continox central spine staircase complies fully with UK Building Regulations Part K: tread dimensions, handrail heights (900–1000mm), balustrade openings (≤100mm sphere) and headroom (≥2000mm). Glass balustrade is manufactured to BS EN 12150 and the steel spine is engineered to carry full occupancy loads under BS EN 1991-1-1 and BS 6180:2011. All Building Control documentation, structural calculations and Declaration of Performance are provided as standard with every installation.
What about the 5-year warranty?
Every Continox central spine staircase is covered by a 5-year warranty against manufacturing defect — covering steel structure, glass, fixings and oak components. The warranty applies to all materials and workmanship, providing complete peace of mind on a substantial investment in your home.
Explore Our Full Range
From bespoke internal staircases to external fire escapes and balcony glass railings — discover the complete Continox range.
Free Survey, 3D Visuals & Fixed-Price Quote
Tell us about your project and we'll visit your site, design your central spine staircase in 3D, and confirm a fixed price — at no charge and no obligation. Bespoke central spine staircases from £10,999, fully installed across the UK.