# Koyda Ltd

> Architectural metalwork and structural steel company at Units 27–29 Jesmor Farm, St Piers Lane, Lingfield, Surrey RH7 6PN, UK. Designs, fabricates and installs glass and metal balustrades, balconies (aluminium, inset, Juliet), staircases, handrails, visual plant screens (not acoustic) and structural steel for main contractors and homeowners in London, Surrey, Sussex, Kent and the South East. Constructionline Silver member. Directors: Joe Cromwell (mobile 07753 213617, joe@koyda.com) and Martin Sweeney (mobile 07956 477966, martin@koyda.com). Opening hours: Monday to Friday, 07:00–17:00. Incorporated 2005, company no. 05632312. Contact page: https://www.koyda.com/contact-us/

Koyda Ltd models every element in SolidWorks, uses Revit for BIM coordination and AutoCAD for 2D drawings, and produces the drawings and design information contractors need for Gateway 2 approval on higher-risk buildings under the Building Safety Act 2022. Each page is also available as Markdown by adding index.md to its URL (e.g. https://www.koyda.com/services/balconies/index.md). Full text of the main pages: https://www.koyda.com/llms-full.txt

## Services
- [Glass Balustrades for Contractors](https://www.koyda.com/services/glass-balustrades/): Frameless and framed glass balustrades for balconies, terraces, stairs and voids. Designed and installed for main contractors in London and the South East.
- [Metal Balustrades & Handrails](https://www.koyda.com/services/metal-balustrades-handrails/): Steel, stainless steel and aluminium balustrades and accessible handrails for stairs, balconies and public spaces. Design, fabrication and installation.
- [Aluminium, Inset & Juliet Balconies](https://www.koyda.com/services/balconies/): Aluminium bolt-on, inset and Juliet balconies for residential schemes. Designed for Gateway 2, installed for main contractors in London and the South East.
- [Steel Feature, Spiral & External Staircases](https://www.koyda.com/services/staircases/): Steel feature, spiral, helical and external staircases for commercial, education and residential projects. Designed, fabricated and installed by Koyda Ltd.
- [Rooftop Plant Screens: Bars & Louvres](https://www.koyda.com/services/plant-screens/): Visual plant screens for rooftop and ground-level plant: vertical bars, aluminium bars or horizontal louvres. Designed for wind load, installed by Koyda.
- [Structural & Secondary Steelwork](https://www.koyda.com/services/structural-steel/): Structural and secondary steelwork for main contractors: beams, frames, door supports, roof plant steel and site welding across London and the South East.
- [Gateway 2 & BIM Metalwork Design](https://www.koyda.com/services/design-engineering-gateway-2-bim/): SolidWorks 3D modelling, Revit BIM coordination and AutoCAD drawings, plus Gateway 2 design information for balconies, balustrades, stairs and steel.

## Sectors
- [Balconies & Balustrades for Residential High-Rise](https://www.koyda.com/sectors/residential-high-rise/): Balconies, balustrades, stairs and steel for residential and mixed-use schemes, including higher-risk buildings that need Gateway 2 approval.
- [Commercial Metalwork & Secondary Steel](https://www.koyda.com/sectors/commercial/): Handrails, feature stairs, walkways, plant screens and secondary steel for offices, hotels and campuses in London and the South East.
- [Stairs, Handrails & Balustrades for Schools](https://www.koyda.com/sectors/education/): Steel stairs, security stairs, handrails and balustrades for colleges, universities and schools. Designed, fabricated and installed by Koyda Ltd.
- [Gates, Railings, Stairs & Garden Metalwork](https://www.koyda.com/sectors/domestic/): Bespoke gates, railings, staircases, balustrades, canopies, pergolas and steel for extensions, for homeowners in Surrey, Sussex, Kent and London.

## Areas
- [Architectural Metalwork Contractor in London](https://www.koyda.com/areas/london/): Balconies, balustrades, stairs, handrails and steel in London for main contractors. Woolwich, Canary Wharf, Imperial College, Shoreditch and more.
- [Steel Fabricators & Metalwork in Surrey](https://www.koyda.com/areas/surrey/): Steel fabrication and architectural metalwork from our workshop in Lingfield, Surrey: balustrades, stairs, gates, railings and structural steel.
- [Metal Gates, Railings & Steelwork in Sussex](https://www.koyda.com/areas/sussex/): Bespoke gates, railings, balustrades, staircases and steelwork in East and West Sussex, made in our Lingfield workshop near the Sussex border.

## Technical guides
- [Balustrade Heights & Loads: BS 6180 and Approved Doc K](https://www.koyda.com/guides/balustrade-heights-and-loads/): Minimum guarding heights from Approved Document K and barrier design loads from BS EN 1991-1-1 and BS 6180, in two tables, with sources.
- [Glass Balustrade Specification: Toughened, Laminated, Low-Iron](https://www.koyda.com/guides/glass-balustrade-specification/): How to specify glass for balustrades: toughened (BS EN 12150), laminated (BS EN 14449), heat soak, impact class (BS EN 12600), low-iron glass, post-breakage.
- [BS EN 1090 & Execution Classes (EXC1–EXC4) Explained](https://www.koyda.com/guides/bs-en-1090-execution-classes/): What BS EN 1090-1, -2 and -3 cover, how execution classes EXC1 to EXC4 are chosen, why EXC2 is the UK default, and CE versus UKCA marking for steelwork.
- [Gateway 2 for Metalwork Packages: Balconies, Balustrades](https://www.koyda.com/guides/gateway-2-metalwork-packages/): What Gateway 2 means for balcony, balustrade and stair packages on higher-risk buildings: timescales, fees, Regulation 7(2), change control and the golden thread.
- [How to Specify Rooftop Plant Screens (Visual Screening)](https://www.koyda.com/guides/plant-screens-specification/): Specifying visual plant screens: planning conditions, wind load to BS EN 1991-1-4, free area, fixing without damaging the roof, finishes and access doors.

## Steel section tables
- [Steel Section Tables UK: Beam, Angle & Hollow Section Sizes](https://www.koyda.com/steel-section-tables/): Free UK steel section tables: UB, UC, PFC, equal and unequal angles, SHS, RHS and CHS. Dimensions, mass, area, I and W, with CSV downloads and a printable PDF.
- [Universal Beam Sizes UK: UB Section Dimensions Table](https://www.koyda.com/steel-section-tables/universal-beams/): UB section dimensions for every UK universal beam, 127×76×13 to 1016×305×487: mass, depth, width, web and flange thickness, root radius, area, Ix and Wel. CSV and PDF.
- [Universal Column Sizes UK: UC Dimensions Table](https://www.koyda.com/steel-section-tables/universal-columns/): UC sizes and dimensions for all UK universal columns, 152×152×23 to 356×406×634: mass, h, b, tw, tf, r, area, Ix and Wel. Free CSV download and PDF.
- [PFC Sizes: Parallel Flange Channel Dimensions UK](https://www.koyda.com/steel-section-tables/parallel-flange-channels/): PFC sizes for all UK parallel flange channels, 100×50×10 to 430×100×64: mass, depth, width, web and flange thickness, root radius, centroid cy, area, Ix and Wel.
- [Equal Angle Sizes UK: Steel Angle Dimensions Table](https://www.koyda.com/steel-section-tables/equal-angles/): Equal angle sizes to BS EN 10056-1, 20×20×3 to 250×250×35: mass, leg length, thickness, root and toe radius, area, centroid, I and Wel. CSV and PDF.
- [Unequal Angle Sizes UK: Dimensions Table](https://www.koyda.com/steel-section-tables/unequal-angles/): Unequal angle sizes to BS EN 10056-1, 30×20×3 to 200×150×18: mass, long and short leg, thickness, radii, area, centroid cx and cy, Ix and Iy. CSV and PDF.
- [SHS Sizes Chart: Square Hollow Section Dimensions](https://www.koyda.com/steel-section-tables/square-hollow-sections/): SHS sizes chart for hot-finished square hollow sections to BS EN 10210-2, 40×40×3.2 to 400×400×17.5: mass, wall thickness, area, I and Wel. CSV and PDF.
- [RHS Sizes Chart: Rectangular Hollow Section Dimensions](https://www.koyda.com/steel-section-tables/rectangular-hollow-sections/): RHS sizes chart for hot-finished rectangular hollow sections to BS EN 10210-2, 50×30×3.2 to 500×300×17.5: mass, area, Ix, Iy and Wel on both axes. CSV and PDF.
- [CHS Sizes Chart: Circular Hollow Section Dimensions](https://www.koyda.com/steel-section-tables/circular-hollow-sections/): CHS sizes chart for hot-finished circular hollow sections to BS EN 10210-2, 42.4×3.2 to 508×17.5: outside diameter, wall thickness, mass, area, I and Wel. CSV and PDF.
- [Universal beams (UB) CSV](https://www.koyda.com/steel-section-tables/csv/koyda-universal-beams.csv): every size in the universal beams table as comma-separated values
- [Universal columns (UC) CSV](https://www.koyda.com/steel-section-tables/csv/koyda-universal-columns.csv): every size in the universal columns table as comma-separated values
- [Parallel flange channels (PFC) CSV](https://www.koyda.com/steel-section-tables/csv/koyda-parallel-flange-channels.csv): every size in the parallel flange channels table as comma-separated values
- [Equal angles (EA) CSV](https://www.koyda.com/steel-section-tables/csv/koyda-equal-angles.csv): every size in the equal angles table as comma-separated values
- [Unequal angles (UA) CSV](https://www.koyda.com/steel-section-tables/csv/koyda-unequal-angles.csv): every size in the unequal angles table as comma-separated values
- [Square hollow sections (SHS) CSV](https://www.koyda.com/steel-section-tables/csv/koyda-square-hollow-sections.csv): every size in the square hollow sections table as comma-separated values
- [Rectangular hollow sections (RHS) CSV](https://www.koyda.com/steel-section-tables/csv/koyda-rectangular-hollow-sections.csv): every size in the rectangular hollow sections table as comma-separated values
- [Circular hollow sections (CHS) CSV](https://www.koyda.com/steel-section-tables/csv/koyda-circular-hollow-sections.csv): every size in the circular hollow sections table as comma-separated values
- [Koyda Steel Section Tables (PDF)](https://www.koyda.com/steel-section-tables/koyda-steel-section-tables.pdf): all eight tables with diagrams, A4, printable

## Projects
- [Projects & Case Studies](https://www.koyda.com/projects/): Case studies of Koyda balconies, staircases, handrails and steelwork in London and the South East, with scope, location and main contractor.

## Company
- [About Koyda Ltd](https://www.koyda.com/about-us/): Koyda Ltd, led by directors Joe Cromwell and Martin Sweeney. Architectural metalwork and structural steel for contractors and homeowners since 2005.
- [Ethos & Mission](https://www.koyda.com/about-us/ethos/): Koyda Ltd's ethos and mission: quality, safety, environmental responsibility and long-term relationships with clients, staff and suppliers.
- [ESG Policy Statement](https://www.koyda.com/about-us/esg/): Koyda Ltd's ESG policy: energy efficiency, waste reduction and carbon, health and safety, diversity and inclusion, community, ethics and governance.
- [Contact Koyda Ltd](https://www.koyda.com/contact-us/): Contact Koyda Ltd, Jesmor Farm, Lingfield, Surrey RH7 6PN. Call or email directors Joe Cromwell and Martin Sweeney about balustrades, balconies, stairs and steel.
- [Careers](https://www.koyda.com/careers/): Work at Koyda Ltd in Lingfield, Surrey: fabrication and welding, site installation, and design and CAD roles using SolidWorks, Revit and AutoCAD.
- [Directors' Update and Outlook for 2026](https://www.koyda.com/news/directors-update-2026/): Koyda Ltd directors' update: aluminium balconies and balustrades, new premises in Lingfield, design investment for Gateway 2, and the outlook for 2026.

## Optional
- [Project Gallery: Balustrades, Stairs & Steel](https://www.koyda.com/gallery-of-works/): Koyda projects: Juliet balconies at Abbey Place Woolwich, feature stairs at Woolwich Civic Centre, Imperial College stairs, Canary Wharf handrails.
- [Privacy & Cookies](https://www.koyda.com/privacy/): How Koyda Ltd uses personal data sent through this website, and the cookies it uses.