How to Write a Playground Technical Specification (EN 1176 Guide)

Most of the decisions that shape a playground tender are made before a single supplier submits a bid. Publishing the tender sets the timeline and the formal procedure, but it is the technical specification that determines what bidders are allowed to propose and how easily those bids can actually be compared.

A vague specification leaves too much room for interpretation, so a city ends up comparing bids that are not really comparable at all: different equipment scope, different safety assumptions, different surfacing solutions, sometimes even different user age groups. An overly specific specification, on the other hand, often narrows the field of bidders down to a single manufacturer, whether or not that was the intention. Both outcomes undermine the entire purpose of running a competitive process.

That is why the specification deserves the same attention as the budget or the site concept design. It is the technical bridge between what a city wants to achieve for its community and what a supplier is bound to deliver, and it is this document that ultimately gets scrutinised when bids are evaluated or challenged.

This guide focuses specifically on how to write that document. It assumes the groundwork described in What Should Public Investors Prepare Before Starting a Playground Project? is already in place, and it builds directly on the distinction between a concept design and a binding technical document explained in Concept Design vs. Technical Specification: What Public Buyers Need to Know.

A tender-neutral specification is not a specification that avoids detail. It is a specification that puts its detail in the right place, describing performance and function rather than a specific product or brand. The goal is for several qualified manufacturers to read the same document and propose genuinely different solutions that all satisfy the same requirements.

Function-based requirements versus brand-based requirements

A function-based requirement describes what the equipment needs to achieve: the age range it is intended for, the type of activity it supports (climbing, balancing, sliding, spinning, sensory play), user capacity, and the dimensional envelope it must fit within on site. A brand-based requirement, by contrast, names a specific product line, a proprietary feature, or describes equipment so precisely that only one manufacturer's catalogue can match it.

For example, instead of requesting a combination tower matching one named manufacturer's product, a function-based requirement would describe a multi-activity structure for a defined age group, with a stated number of access points, a stated platform height range and a stated combination of activity types. Any manufacturer able to design and certify equipment meeting those parameters can then submit a compliant bid, using its own design language and engineering approach.

The same logic applies to materials, finishes and even the overall aesthetic direction. A specification can and should state that equipment must be weather-resistant, durable under intensive public use and visually consistent with a given design theme, without requiring a specific coating or a particular manufacturer's signature shape.

Neutrality is not a formality. It is what makes a procurement process defensible if anyone ever challenges it, whether an unsuccessful bidder, an auditor or the body funding the project. A specification that only one supplier can satisfy is difficult to justify as the outcome of open competition, even when that was never the intent behind the wording. Procurement rules, neutrality requirements and permitted tender formats vary by country and by the type of public body running the process. This guide describes technical best practice for writing a specification that supports fair bid comparison; it does not constitute legal advice.

What EN 1176 regulates

EN 1176 is a European series of standards covering playground equipment design, safety requirements and test methods. It sets out how equipment such as climbing structures, slides, swings and combination structures should be designed and tested so that foreseeable risks are appropriately addressed for the intended age group. In Croatia it has been adopted nationally as HRN EN 1176, and in the UK as BS EN 1176; the underlying European standard is the same, though national designations differ. A specification that references this standard for equipment is asking bidders to prove their products were designed and tested to that series.

REDOX designs and manufactures its playground equipment to EN 1176. That claim relates specifically to equipment design and does not extend to surfacing, to installation practice in any particular market, or to any standard not named here. A specification should be equally precise about what it asks bidders to prove and which standard applies to which part of the project.

The equipment section of the specification should typically cover: dimensions and layout including footprint constraints and platform heights; age group and user capacity stating which age groups the equipment must be intended for; materials and finishes described through required properties such as weather resistance and suitability for public outdoor use; structural and mechanical safety requirements including stability, moving parts and entrapment prevention; critical fall height for every unit in the bid; and proof of conformity in the form of a certificate issued by an independent certification body accredited under EN ISO/IEC 17065, not a declaration issued by the manufacturer itself.

Requesting this proof upfront, as part of the bid itself, is one of the simplest ways to keep the evaluation process fair and grounded in verifiable facts rather than marketing claims.

What EN 1177 regulates

EN 1177 relates to impact-attenuating playground surfacing, including how surfacing performance is tested and how critical fall height is determined for a given surface. It is a separate standard from EN 1176, and the distinction matters: EN 1176 covers the equipment itself, while EN 1177 covers the surfacing beneath and around it. A specification should reference each standard in the correct context, and should never present surfacing requirements as if they were regulated by EN 1176, or equipment requirements as if they were regulated by EN 1177.

Surfacing is one of the areas where specifications most often slip into brand-based language, usually by naming a specific product instead of describing the required performance. A tender-neutral approach specifies surfacing through the required critical fall height matched to the equipment installed above it, a surfacing category suited to the site and budget such as poured-in-place rubber, rubber mulch or artificial turf with a shock-absorbing underlay, described generically, and proof of performance that a bidder must submit to demonstrate the surfacing meets the stated critical fall height under EN 1177.

Specifying surfacing this way keeps the requirement measurable, allows more qualified surfacing suppliers to participate, and prevents the tender from unintentionally steering towards one supplier's proprietary surfacing system.

Materials in the specification should be stated as requirements, not as claims about what a particular supplier's materials happen to offer. A well-written materials section typically covers timber protection (for example, the level of protection against rot, insect damage and weathering appropriate to the local climate), metal coatings (corrosion resistance suited to site exposure, whether coastal, urban or continental), and plastics and other synthetic components (UV resistance and resistance to the fading and brittleness that outdoor exposure causes over time).

It is also worth describing the site's expected conditions: whether it is a coastal location exposed to salt, whether the site experiences extreme temperatures, heavy rainfall or high user frequency, and whether the playground will be used year-round or seasonally. When these conditions are described as circumstances the equipment must be suited to, rather than as a list copied from one manufacturer's brochure, the requirement stays genuinely open to different material approaches that can each achieve the same durability outcome in their own way.

Installation is often under-specified, even though it directly affects safety, cost and long-term maintenance. A thorough specification should cover foundation and anchoring requirements suited to the equipment and soil conditions, since different ground types and site conditions call for different anchoring approaches. It should also cover accessibility, including how the playground and its surfacing connect to accessible routes, and whether the equipment needs to support inclusive or accessible play requirements defined by the buyer.

The scope of site preparation should be clearly stated: which levelling, drainage or site-clearing work is included in the supplier's bid, and which is the responsibility of the city or a separate contractor. It should also directly address coordination between the equipment supplier and any surfacing or drainage contractor, since gaps in that coordination are a common source of delay and dispute once installation begins. Leaving these items unclear in the specification typically resurfaces later as change orders or scope disputes, which is exactly the outcome a clear specification is meant to prevent.

Documentation before installation

Before equipment and surfacing arrive on site, the specification should require bidders to submit certificates of conformity issued by an independent certification body accredited under EN ISO/IEC 17065, confirming their products meet the stated standards, relevant test reports supporting those certificates, and technical data sheets describing the equipment or surfacing in enough detail to be checked against the specification. A declaration of conformity issued by the manufacturer itself is not equivalent to a third-party certificate and should not be treated as sufficient proof of conformity. Requesting this documentation as part of the bid, rather than after contract award, allows a city to compare bids on equal terms before any contract is signed.

Documentation after installation

Once equipment is installed, the specification should require installation records confirming the work was carried out according to the design, an inspection and maintenance plan setting out what routine checks the equipment will require going forward, and clearly stated warranty terms covering both equipment and surfacing. These records also form the basis for ongoing site safety management once the playground opens.

This is a summary of what to request. A complete overview of the documentation to collect at each stage, along with the procurement risks missing documentation can create later, is covered in Playground Procurement Documentation Checklist: What to Request and What Happens If You Don't. For guidance on evaluating bids once that documentation is available, see How to Fairly Compare Playground Contractor Bids.

Specifications are easier to write, and easier for suppliers to respond to, when they follow a consistent format. A practical structure typically includes: scope and site context describing the project, site conditions and intended users; equipment requirements covering function, dimensions, age groups, capacity and safety requirements aligned with EN 1176; surfacing requirements covering critical fall height and surfacing category aligned with EN 1177; materials describing durability and finish requirements suited to the site; installation covering foundations, accessibility, site preparation and coordination; documentation and warranty listing the evidence to be submitted before and after installation including third-party certificates for both equipment and surfacing; and evaluation criteria explaining how bids will be assessed against the specification.

This structure is a practical starting point, not a template mandated by any particular procurement system. Local procurement rules, whether national, regional or local, will determine the final format, required forms and submission process, and those local rules should always take precedence over this general structure. This section describes technical best practice, not legal or jurisdiction-specific procurement guidance.

A handful of recurring mistakes undermine neutrality even in specifications written with good intentions. Carrying over language from one supplier's catalogue often happens unintentionally, when an early concept design or a manufacturer's brochure is used as the basis for the specification text without being rewritten into function-based language.

Requiring a named product or brand feature without an equivalence clause. Naming a specific product occasionally has a legitimate technical reason, but when it does, the specification should include a clause allowing bidders to propose an equivalent solution meeting the same performance.

Under-specifying surfacing performance. Leaving the critical fall height or surfacing category vague makes bids harder to compare and can leave a genuine safety gap if a bidder's proposed surfacing does not actually match the equipment installed above it. Omitting documentation requirements: a specification that does not request third-party certificates, test reports or installation records upfront makes later comparison and verification considerably harder than it needs to be.

Avoiding these mistakes largely comes down to consistently asking whether a given requirement describes a performance outcome or one supplier's product. If it is the latter, it is worth rewording.

REDOX designs, manufactures and installs playground equipment to EN 1176 and works with surfacing solutions aligned with EN 1177. Because REDOX is involved across the full chain, from initial design through manufacturing to installation, the team has a practical understanding both of what a specification should require and of what is realistic to build and install.

This experience is offered in a deliberately limited way. REDOX does not write tender documentation on behalf of a city, and does not write specifications designed to favour its own product range, since that would work against the very purpose of a tender-neutral document. What REDOX can do is help a city or public buyer translate the project's goal and site conditions into function-based specification language, the kind any qualified supplier can bid on fairly. That usually means a conversation about the site, the intended age groups and activities, and any site constraints, and help shaping those elements into requirements rather than product descriptions.

Cities, municipalities and public buyers can send REDOX their site data and project goal for an initial conversation about specification preparation.