Scaffolding compliance UK 2026: complete guide for contractors (CISRS, TG20, NASC, CHAS)

If you run a scaffolding business in the UK, compliance is the difference between getting work and being shut out of every commercial site. Principal contractors will not let an uncompliant scaffolder onto their job, and many local authority contracts have minimum standards that are non-negotiable. This guide covers everything a UK scaffolding contractor needs in 2026, from CISRS cards and TG20 design parameters through to NASC membership, CHAS accreditation, insurance, and the documents you will be asked to share before you can put up a single tube.

What "compliance" actually means for a scaffolding company

Compliance for a scaffolding contractor is not a single document. It is a layered evidence package that proves three things to a principal contractor: that your business is legally trading and insured; that the people erecting the scaffolding are competent; and that the scaffold structure itself meets a recognised design standard. Each of those layers has separate requirements, separate paperwork, and separate expiry dates. When any one of them is out of date, the whole package fails the gate check at the start of a project.

The legal foundation is set by the Work at Height Regulations 2005, the Construction (Design and Management) Regulations 2015 (CDM 2015), and the Health and Safety at Work etc. Act 1974. Underneath those primary regulations sit industry standards — TG20 for tube and fitting scaffold design, the CISRS record scheme for individual competence, and NASC SG4 for safe erection and dismantling. Principal contractors then layer their own prequalification standards on top, which is where CHAS, SMAS, Constructionline, and the Common Assessment Standard come in.

CISRS cards: the minimum personal qualification

The Construction Industry Scaffolders Record Scheme (CISRS) is the UK's recognised competence card scheme for scaffolders. If you employ scaffolders, every man on the gang who erects, alters or dismantles scaffolding must hold the appropriate CISRS card for the work they are doing. The Health and Safety Executive considers CISRS the standard way to demonstrate competence under the Work at Height Regulations.

The card grades are straightforward but progress through them takes time and on-site experience.

Trainee Scaffolder Part 1 (Red). Entry-level. Requires CITB Health, Safety and Environment Test plus the CISRS Part 1 course. The trainee can work as part of a gang under direct supervision but cannot lead any erection or dismantle.
Scaffolder (Blue). Six months of site experience after Part 1, then CISRS Part 2 plus an NVQ Level 2 in Accessing Operations and Rigging. A blue card holder can erect basic and intermediate scaffolds, including everything within TG20 parameters.
Advanced Scaffolder (Gold). Twelve months as a Blue card holder, then CISRS Advanced course plus NVQ Level 3. Required for complex structures outside TG20 — heavy-duty scaffolds, suspended scaffolds, temporary roofs, mast-climbers, and most bespoke designs.
Scaffolding Supervisor / Scaffolding Manager. Held by working foremen and contracts managers. The CISRS Supervisor course is 5 days; the Manager course assumes existing competence and adds responsibility for planning, inspection, and contract delivery.
Scaffolding Inspection (Basic and Advanced). A separate qualification for those carrying out the statutory weekly inspections. Many companies have at least one supervisor or manager dual-qualified as an inspector so they can sign off their own work.

CISRS cards expire every five years. Renewal requires the latest CITB HS&E Test plus a CISRS-approved refresher course. Allowing a card to lapse means the person is no longer considered competent, even if they have been in the trade for thirty years. From a principal contractor's perspective, an expired card is exactly the same as no card at all, and most pre-start gate checks will turn the scaffolder away. CISRS publishes the official scheme documentation and accredited training centres on its website.

TG20 and bespoke design

The technical guidance for tube and fitting scaffolding in the UK is TG20, published by the National Access and Scaffolding Confederation (NASC). The current version is TG20:21, replacing TG20:13. TG20 sets out pre-calculated standard configurations, expressed as compliance sheets, that cover the vast majority of independent and putlog scaffolds used in the UK. If your scaffold falls within the TG20 envelope — typical residential and commercial heights, standard loadings, common bay lengths and tie patterns — you do not need a bespoke calculation. The TG20 compliance sheet is the design.

The catch is that any departure from TG20 requires a bespoke design by a qualified scaffold engineer. This is not optional or a recommendation. The Work at Height Regulations explicitly require it. Departures include unusually tall scaffolds, heavy material loadings, debris netting on a windy elevation, restricted tie locations, special mechanical handling, attachments such as hoists, and almost any temporary roof or birdcage. Trying to use TG20 outside its parameters is one of the most common compliance failures in the industry, and one of the easiest for an HSE inspector to identify.

System scaffold (Layher, Cuplok, Plettac, Kwikstage, Haki, Peri Up) follows the same principle but with the manufacturer's user guide replacing TG20. Each system has its own pre-calculated standard configurations, and the same rule applies: outside the standard configurations, you need a bespoke design.

Inspections: every seven days, or you are not legally compliant

Once a scaffold is erected and handed over, it must be inspected before first use, after any event likely to have affected stability (high winds, impact, alteration), and at intervals not exceeding seven days. The interval is hard. A scaffold that has not been inspected within the last seven days is not legally compliant and cannot be used until it is.

The inspection must be by a competent person. Competence is normally established through a CISRS Scaffolding Inspection card, but a non-scaffolder with appropriate training (typically a site manager who has completed a basic inspection course) can inspect simple structures. Each inspection must be recorded on a suitable form. The TG20:21 inspection form or a digital equivalent is what most companies use. Inspection records must be kept for the lifetime of the scaffold plus three months. The HSE's scaffolding guidance explains the inspection regime in full.

Handover certificates

The scaffold handover certificate is the document that transfers responsibility for the scaffold from the scaffolding contractor to the principal contractor (or whoever is using the scaffold). Without a handover certificate, no other trade should step onto the scaffold. The certificate records who erected it, when, to what design, the safe working load, and any restrictions or conditions of use.

If alterations are made — even seemingly minor ones, such as removing a board, repositioning a tie, or adding a brace — a new handover is required. This is a compliance area where small habits cause big problems. A bricklayer who shifts a board to get easier access has, technically, invalidated the handover. Train your gangs that any alteration is the scaffolder's job, even if it takes thirty seconds, and the new handover takes another five.

NASC membership

The National Access and Scaffolding Confederation is the principal trade body for the UK scaffolding industry. NASC membership is voluntary, but a significant proportion of commercial work — particularly local authority, education, healthcare, and infrastructure contracts — requires the scaffolding subcontractor to be NASC members. Membership requires compliance with a detailed audit covering insurance, training, technical competence, employment standards, and financial standing.

If you are pricing for commercial work and you are not NASC, you will frequently see contracts you cannot bid for. The audit is thorough and takes time to prepare for, but for any scaffolding business intending to grow into the commercial mid-market, NASC membership pays back through the contracts it unlocks. NASC also publishes the technical guidance (TG, SG, and CG series) that most principal contractors will reference in their pre-start documentation.

CHAS, SMAS, and Constructionline

These are the three most common "Safety Schemes in Procurement" or SSIP-recognised accreditation bodies. They exist to save principal contractors from having to audit the same documents from every subcontractor every year. You complete one detailed assessment with one of them, get accredited, and that accreditation is then recognised by every other SSIP-registered scheme through mutual recognition.

What they actually check is your health and safety paperwork: safety policy, risk assessments and method statements, training records, accident records, insurance, contractor competence procedures, plant inspection regimes, and how you manage your own subcontractors. The work to put together your first submission is significant — most scaffolders spend two to four working weeks on it — but renewals are far quicker if you have kept your paperwork in order through the year.

Most local authority and Tier 1 contractor work in the UK requires SSIP-accredited scaffolders. If you are quoting for that kind of work and you do not hold one of these accreditations, expect your bid to be rejected at the prequalification stage. We have written a separate guide to getting CHAS or SMAS accreditation with the documents you need to prepare and the common reasons applications fail.

Insurance: minimums and reality

Three insurances are non-negotiable for a scaffolding company.

Public liability insurance covers third-party injury or property damage caused by your work. The legal minimum is whatever your contract requires, but in practice principal contractors expect £5 million as a floor and £10 million for any commercial or public-facing site. Some local authority contracts now require £10 million as standard. NASC membership requires £10 million minimum.

Employers' liability insurance is a legal requirement under the Employers' Liability (Compulsory Insurance) Act 1969. The legal minimum is £5 million, but most policies provide £10 million by default. Failing to hold valid EL insurance carries an unlimited fine and personal liability for the directors.

Professional indemnity insurance is required if your scaffolding company also provides design services — for example, if you offer bespoke scaffold design as part of your bid. £1 million is a reasonable floor; some commercial contracts require £2 million or higher. If you only erect to existing TG20 or to designs provided by others, PI is not strictly required, but many contractors still ask for it.

What goes wrong most often is policy expiry. A scaffolder turns up to a job, the gate check spots that public liability ran out three days ago, and the gang is sent home. The fix is straightforward: every insurance certificate needs an expiry alert at least four weeks before the renewal date so you have time to deal with it without losing days on site.

The documents principal contractors will ask for

When you win a job and the principal contractor sends you their pre-start pack, expect to be asked for all of the following:

Public liability and employers' liability certificates, in date
SSIP accreditation certificate (CHAS, SMAS or Constructionline)
NASC membership certificate, if applicable
CISRS cards for every operative on the gang, photographed both sides
CSCS Health, Safety and Environment Test results
Project-specific RAMS (risk assessment and method statement) signed by the author and the team
Scaffold design (TG20 compliance sheet or bespoke design with engineer's stamp)
Asbestos awareness training certificates for everyone on site
Manual handling training certificates
First aid certificate for the appointed person on the gang
Vehicle insurance and MOT for any vehicles entering site
LOLER inspection records for any lifting equipment (gin wheels, hoists)

That is twelve separate documents, some of which apply per person, and each with its own expiry. The administrative burden of keeping all of this current and ready to share is significant, and it is the single biggest reason scaffolding companies miss out on contracts. Compliance fails not because the work is wrong, but because the paperwork is out of date or cannot be found.

RAMS: project-specific, not a generic template

Every scaffolding job needs a Risk Assessment and Method Statement (RAMS) that is specific to that project. A generic template downloaded from the internet, with the project address pasted in, is not RAMS. It is paperwork pretending to be RAMS, and an experienced site manager will spot it immediately.

A proper scaffolding RAMS identifies the specific hazards on this specific site (overhead power lines, restricted access, fragile roof, asbestos, public footfall, weather exposure), assesses each one, and sets out the controls in enough detail that a new starter could follow the method. Loadings, sequencing, tie patterns, fall protection arrangements, exclusion zones, weather thresholds, emergency procedures — all of it should be in there. We have a separate guide to writing scaffolding RAMS that walks through what to include.

Compliance is a system, not a folder

Most scaffolding companies start with paper and folders. Insurance certificates in one folder, training records in another, RAMS templates in a third, and a constant low-level fear that something has expired without anyone noticing. That works for a one-man band. It does not work once you employ five gangs and quote for fifty jobs a month.

The shift to a digital compliance system pays back the moment a principal contractor asks for documents and you can share a clean, in-date pack within five minutes instead of two days. It pays back again when an HSE inspector arrives unannounced and you can produce the relevant records on a phone. And it pays back a third time when a CISRS card is about to expire and the system flags it four weeks early instead of you finding out at the site gate.

Complys is built specifically for UK scaffolding contractors. Every document, every CISRS card, every training certificate, every insurance renewal, with expiry alerts and a one-click compliance share to send a complete pack to a principal contractor. Start a 90-day trial and see whether it fits how your business actually runs.

Quick reference: the scaffolding compliance checklist

For a printable version with every document type listed against the trade, the principal contractor's expectations, and the typical expiry intervals, see our scaffolding compliance checklist. It is the document we send to our own customers when they are pulling together a CHAS submission or a Tier 1 prequalification.