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Stairplan Ltd - Tradestairs.com Hortonwood 1, Telford, Shropshire, TF1 7GN, United Kingdom.

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12-Riser Flatpack Staircase Kit (2300mm - 2640mm Floor-to-Floor)

12-Riser Flatpack Staircase – Custom-Made for Your Project

12-Riser Flatpack Staircase – Custom-Made for Your Project


Pre-Cut 12-Riser Straight Staircase – Made to a standard 42º pitch

Strong 32mm EdgeLam Engineered Pine Strings – Heavy-duty construction for long-lasting support

22mm MDF Treads & 12mm MDF Risers – Durable & designed for smooth assembly

Made to Measure – Floor-to-floor height options from 2300mm to 2640mm

Quick Lead Time – Typically 2 to 3 weeks from drawing approval

Confirmation drawing provided before production starts

Delivery time varies by location – Get a quote at checkout

Watch Our Assembly Instruction Video for Easy Installation

Flatpack 12-Riser Straight Trade Range Staircase

Flatpack 12-Riser Straight Trade Range Staircase

Ref: TS11N-FLATPACK

The 12-Riser Flatpack Straight Staircase is a pre-cut, easy-to-assemble timber staircase kit designed for loft conversions, home renovations, and extensions. With a 42º pitch, this staircase is a perfect fit for standard UK building regulations, ensuring a comfortable and compliant step experience.


Key Specifications:

Total Risers: 12 (For Floor-to-Floor Heights: 2300mm - 2640mm)
Pitch: Standard 42º (May vary slightly for lower rise heights)
String Material: 32mm EdgeLam Engineered Pine – Durable & strong
Treads: 22mm MDF – Smooth finish for easy treatment
Risers: 12mm MDF – Secure, impact-resistant panels
Typical String Depth: 240mm

Note: Staircases with individual riser heights under 198mm will have an individual going size of 220mm, making the pitch slightly less than 42º.

Width : Select Overall Width Including Side Strings

Price: £355.00 (Excluding VAT at 20%)

Help on Rise and going

Related products:

  1. Flatpack 13 Riser Straight Trade Range Straight Staircase
    £426.00 (Ref: TS12N-FLATPACK)

12 Riser Straight Staircase Plan and Side View

12 Riser Straight Staircase Plan and Side View

Understanding Your Staircase Dimensions – Plan & Side View Guide

Our detailed plan view and side view staircase drawings provide the essential measurements needed for accurate installation. Each drawing includes:

Total Width – The overall width of the staircase, including strings

Total Rise – The finished floor-to-floor height, ensuring proper fit

Total Going – The horizontal distance from the back of the top riser (where the staircase meets the trimmer joist) to the front nosing of the bottom step

Important Installation Note:

The stair stringers extend beyond the total going measurement, but they can be trimmed on-site during installation for a perfect fit.

Why Choose This Flatpack Staircase Kit?


Bespoke to Your Dimensions – Custom-built to fit your project

Complies with UK Building Regulations – Ensuring safety & stability

Perfect for DIY Assembly & Quick Installation – Pre-cut for fast fitting

Comes with Confirmation Drawings – Sent before production for approval

Lead Time: Typically 2-3 weeks from drawing approval (subject to location & logistics)

Order Online Today – Fast UK Delivery Available!

Need a taller staircase? Check the 13-Riser Flatpack Kit

Looking for a lower height? Look at our Short Staircases

Questions? Call Us at 01952 608853 or Email sales@stairplan.com