Writing Door Hardware Section 08 71 00 in 2026: The Three Parts, What Belongs in Each, and the Clauses That Cost Money

Door hardware is section 08 71 00 in MasterFormat, and the section has a fixed three-part shape that every specifier, contractor and supplier reads in the same order. Knowing the shape is not pedantry — it is the difference between a package that gets quoted and one that generates four rounds of questions.

The rule that explains most of the mistakes: **Part 1 is obligations, Part 2 is things, Part 3 is what happens on site.** A sentence in the wrong part is either ignored or priced twice.

What belongs in each part

The two most common misplacements are worth naming. A warranty clause written into Part 2 attaches to one product rather than to the package. And a mounting height written into Part 2 arrives with the product data rather than with the installer, which is the one person who needed it.

Part 1: the four clauses that decide the price

These are the ones that look procedural and are not.

**Substitution procedure.** Whether substitutions are permitted, what evidence is required, and by when. A section that is silent on this gets substitutions anyway, decided by whoever is under the most cost pressure. Our submittal page covers what a substitution request has to contain to be assessable.

**Keying.** Who owns the key system, who may authorise a cut, and whether the register is a deliverable. This clause decides whether the building has a documented key system in ten years or an archaeological problem. It costs nothing to write and cannot be added later.

**Test evidence.** Which certificates are required, to which standard, and whether they are required at tender or at submittal. Asking at tender narrows the bidders to those who hold the evidence; asking at submittal finds out after a price is fixed, which is where the pressure to accept a marketing claim comes from.

**Warranty.** Length, what it covers, and whether it survives a change of building owner. "Manufacturer's standard warranty" is not a term; it is a promise to accept whatever the manufacturer's standard turns out to be.

Part 2: how to write a hardware set

A hardware set is the unit a factory quotes. It should be written so that somebody who has never seen the building can price it.

Give the set a number, list every item with quantity, manufacturer, catalogue number, finish code and function, and state the openings the set applies to. The schedule then maps openings to set numbers rather than repeating the items.

The four values that get left out, in order of how expensive they are: the finish code (a name is not a code), the function (a description is not a function), the handing with its convention named, and the door thickness and backset for anything mortised or bored.

Write performance requirements next to the product they constrain, not in a general paragraph. "Grade 1" at the top of Part 2 and a lever at the bottom leaves it ambiguous whether the lever is included.

Performance specifying versus proprietary specifying

Two legitimate approaches, and mixing them badly is where sections go wrong.

A **proprietary** specification names manufacturers and catalogue numbers. It is precise and it narrows the field, which may be exactly the intent.

A **performance** specification states what the product must achieve — a durability grade, a corrosion class, a fire classification, a maximum opening force — and lets any product that demonstrably meets it compete.

The common hybrid, "Manufacturer X model Y, or approved equal", is only useful if the section also says what equal means. Without that, "equal" is decided during value engineering by comparing shared features rather than differences, which is the failure mode described on our submittal page.

The stronger hybrid names the product **and** the two or three properties that made it the choice. Then a substitute can be assessed against something.

Part 3: the clauses installers actually need

Mounting heights, stated once with units. Where a lever centre is specified, give it in the units the site works in and say from what datum — above finished floor is the usual, and "finished" matters where a screed or a carpet is still to come.

Adjustment sequencing. Door closers should be adjusted after the building's air handling is balanced, because air pressure changes the force a door needs. A closer set perfectly in an unpressurised building is a closer that will be complained about.

Fire door instruction. That no component of a fire-rated assembly may be substituted or drilled beyond the tested configuration, and that any variation requires evidence.

Handover. The key register, the operating instructions, and the list of what was actually installed against what was scheduled — because those two lists differ on every project and the difference is worth recording while somebody still remembers why.

The reference clause, and how to cite a standard so it binds

Part 1 lists the standards the section relies on, and a sloppy reference clause is the most common way a specification becomes unenforceable without anybody noticing.

Cite the standard by its full designation, and say which part or classification is required. "Comply with EN 1935" is not a requirement — EN 1935 classifies hinges across eight fields, and a hinge of any grade complies with it. "EN 1935 grade 13, corrosion grade 4, suitable for fire doors" is a requirement, because a product either meets it or does not.

Say whether you mean the standard as published, or as amended. A dated reference freezes the requirement at a known text; an undated one moves with the standard, which is usually what a long project wants and occasionally is not.

Do not cite a standard you are not going to check. A section that names eleven standards and receives evidence for none of them has taught the supply chain that the reference list is decoration, and that lesson applies to the standards that mattered as well.

And do not cite a standard from the wrong market. EN 1634-1 and UL 10C test overlapping but different things, as our fire door page sets out, and a section that names both without saying which governs has asked for something no product holds.

Mounting heights, and the datum that decides them

Heights belong in Part 3 because the installer is the reader. Two things have to be stated: the number, and what it is measured from.

The datum is the part that goes wrong. "Above finished floor" means above the floor as it will finally exist — after the screed, after the tile, after the carpet. On a project where the hardware is installed before the floor finish, a height set from the slab is wrong by the thickness of whatever arrives later, and it is wrong consistently across every door in the building.

Common practice puts a lever centre around 1050mm (41-3/8") above finished floor, with exit device push bars and pull handles falling in a band roughly between 900mm (35-7/16") and 1100mm (43-5/16") depending on the device and the jurisdiction. Treat those as a starting point rather than a requirement: accessibility rules set the binding figures and they differ by country, so confirm the number that applies to the building before writing it.

Where a project is bound by an accessibility standard, cite the standard in Part 1 and repeat the resulting height in Part 3. The installer works from Part 3 and will not read the reference list, and the reference list is what makes the height defensible.

Revisions, and the one habit that prevents the worst arguments

A hardware section is revised — by addendum at tender, by instruction during construction, and by substitution after award. Each revision is a chance for two parties to end up holding different documents.

Give every issue a revision number and a date, put both in the header of the schedule as well as the section, and state in Part 1 that only the latest issue governs. It sounds like bureaucracy and it is the cheapest dispute prevention in the package.

The argument it prevents is specific and common: a set changed by addendum, the addendum reaching the contractor but not the supplier, and forty openings arriving to the superseded set. Nobody in that sequence did anything unreasonable, and the cost lands on whoever cannot prove which issue they were working to.

Keep the superseded issues rather than overwriting them. When the question arrives eighteen months later about why an opening has the hardware it has, the answer is in the version that was current when it was ordered.

What we need to quote a section without asking questions

The hardware sets, with the four values above per line. The opening schedule that maps sets to doors. The finish codes. The fire-rated openings, marked as such. And the door types and thicknesses, because a lock that suits a 45mm timber leaf may not suit a 45mm hollow metal one.

With those, a quotation comes back as a quotation. Without them, it comes back as a list of questions — and the round trip is usually a week per round, which is why this section is worth the hour it takes to write properly.

Where our catalogue cannot meet a clause, we say which clause rather than quoting around it. A supplier who quotes a performance specification without holding the evidence has not won the package; they have deferred the conversation to the submittal stage, where it costs everybody more.