Specifying Door Fittings: What Architects, Planners, and Developers Should Keep in Mind in the Specifications

Specifying lever handles, Rose and escutcheon sets, or modern hardware solutions with precision helps prevent change orders, coordination efforts, and unsuitable product alternatives.

This article explains which specifications are important for door fittings in a bid—from DIN EN 1906 to door thickness and Type of locking, as well as Finish, installation type, and design line.

Door fittings are among the building components that are used daily. They are seen, touched, and subjected to stress, yet are often only consciously noticed when something is wrong: the Handle doesn’t fit properly, the finish differs from the sample, the Type of locking is incorrect, or installation is delayed because accessories are missing.

This is precisely why door fittings should not be treated merely as a standard item in the specifications. They serve as the interface between the door leaf, the lock, the room’s function, and the design. In residential buildings, office spaces, hotels, educational facilities, or public buildings, they meet different requirements. A bathroom door requires a different locking mechanism than an office door. A high-traffic commercial area places different demands on durability and mounting than a rarely used Internal door.

Vague wording such as “Supply and install stainless steel door handles” leaves plenty of room for interpretation. It remains unclear, for example, which rosette shape is desired, which type of locking is required, which service class must be met, which finish is actually intended, and whether the door lever handle sets are compatible with the door thickness. This results in follow-up inquiries, sampling loops, or addenda.

It is better to specify door fittings in a way that clearly describes technical requirements, aesthetic specifications, and installation conditions. This ensures not only proper function but also the overall architectural appearance.

The first question in any request for proposals is what type of hardware is actually being referred to. In everyday language, terms such as “door handle,” “lever handle,” “lever handle set,” or “door fittings” are often used interchangeably. However, this is usually not sufficient for the specifications.

A lever handle set generally consists of two lever handles and the corresponding rosettes or escutcheons. In rose and escutcheon sets, the lever handle and keyhole are visually separated. The lever handle is positioned at handle height, with the key escutcheon located below it. 

Rose and escutcheon sets are particularly well-suited for modern interior design because they have a more minimalist appearance than classic long backplate sets. They can be easily combined with various door leaves, frames, and finishes. For the bid specifications, this means: The rosette shape should be explicitly specified. Round, straight-edged, flat, or particularly minimalist are different design solutions.

With escutcheon sets, a long backplate or a short backplate visually connects the handle and the locking area. This may be a deliberate choice, for example, in more traditional door designs or to meet specific commercial requirements. Here, too, the type of hardware should not be left open but should be clearly specified in the specifications.

Not every door fitting is suitable for every type of door. Fittings for wooden internal doors must meet different technical requirements than glass door fittings or sliding door systems. Therefore, these categories should be addressed separately in the specifications.

For wooden internal doors, specifications regarding door thickness, lock type, rosette shape, and Type of locking are particularly important. With glass doors, additional factors come into play, such as glass thickness, Lock case, hinges, handle type, and visual coordination. For sliding doors, it must also be clear whether an inset handle, a bar handle, or a lockable solution is intended.

For planners and developers, the following is therefore recommended: Do not specify fittings in a blanket manner for “all doors.” Work with door lists, room schedules, or separate specifications items for Wooden internal doors, glass doors, and Sliding doors. This allows technical requirements to be clearly assigned.

DIN EN 1906 serves as an important guideline for lever handles and knobs. It specifies requirements and test methods for lever handles and knobs used to operate locks or similar mechanisms. Among other things, the standard defines properties such as endurance, corrosion resistance, free angular movement, and displacement. 

Important for requests for proposals: DIN EN 1906 does not replace a precise product description. It makes performance characteristics comparable but does not automatically specify the desired form, finish, rosette type, or locking function. These details must be additionally described in the specifications.

A suitable formulation would be: “Door lever handle set tested to DIN EN 1906, service class according to the area of use.” For high-traffic areas of a building, the appropriate service class should be explicitly defined.

The wear and tear on door fittings depends heavily on where they are used. A door in a private home is used differently than one in a hotel, school, office building, or public restroom. The more frequently a door is opened and closed, the more important durability, secure mounting, and appropriate product quality become.

Therefore, the service class should not be chosen arbitrarily. Different requirements may suffice for normal residential areas than for commercial areas with high usage frequency. GRIFFWERK specifies specific service classes for individual product variants. For example, according to the product specifications, the TRI 134 rose and escutcheon set complies with DIN EN 1906 for usage class 3; the METRICO PROF door handle set is designated for usage class 4. 

For architects and planners, this means that the usage class should match the type of room and the expected use. This helps you avoid proposing a suitable-looking but technically unsuitable Fitting.

Not every door is a standard internal door. In many projects, there are doors with special requirements: fire protection, smoke control, escape and rescue routes, burglary resistance, barrier-free accessibility, or specific hygiene requirements.

These requirements should not be implicitly included in a general door fitting specification. They must be reviewed on a project-by-project basis and described separately. Whether a fitting is suitable for a specific special-purpose door depends on certifications, approvals, door systems, and the specific installation situation.

Therefore, it is important for the specifications: Describe standard interior door fittings separately from fittings for special-purpose doors. For fire-rated, smoke-controlled, Panic, or emergency exit doors, the requirements should be clearly linked to the door system, the relevant standards, and the required certifications.

Each hardware specification should be clear about the door type and the intended application. Is it a wooden internal door, a glass door, a Sliding door, or an apartment entrance door? Will the fittings be used in a private living space, a bathroom, an office, a hotel room, or a high-traffic hallway?

This information is crucial because it influences the type of locking, load-bearing capacity, Finish, and installation. A door in a WC requires a different solution than a conference room door. A high-quality interior apartment door has different design requirements than a door to a utility room.

A possible specification wording is:

“Door lever handle set for internal wooden doors, intended for use in residential and office settings, normal to high frequency of use, design as specified in the door list.”

Door thickness is one of the most important technical specifications. If the fitting does not match the door leaf, problems may arise during installation, operation, or mounting.

Many GRIFFWERK door handle sets are specified for specific door thicknesses. For example, the TRI 134 and METRICO PROF are designed for internal wooden doors with thicknesses ranging from 38 to 45 mm. 

The door thickness should therefore be included in the specifications. A suitable wording would be:

“Suitable for door thicknesses of 38–45 mm, or as specified by the door panel construction and manufacturer’s instructions.”

For special doors, flush-mounted doors, or doors with unique door panel constructions, compatibility should be verified additionally.

The type of locking is one of the most common sources of error when specifying door fittings. It must be appropriate for the room’s function and should ideally be determined based on the door list.

Typical types of locking include:

• BB / standard key for classic Room doors,
• PZ / Profile cylinder for doors with cylinder locks,
• WC for bathroom and toilet doors,
• OS / without Escutcheons for not lockable doors,
• smart2lock for an integrated lock in the Handle.

GRIFFWERK also describes these types of locking on its product pages: Cipher bit key sets are suitable for Room doors; doors with a lock cylinder require PC sets; and bathroom and toilet doors are typically equipped with WC sets. With smart2lock, the locking mechanism is integrated into the Handle; a traditional Escutcheon is not required. 

The following is recommended for the specifications:

“Type of locking according to the door list: BB/PZ/WC/OS/smart2lock. Rooms requiring privacy should be designated separately.”

Rosettes are functionally necessary and play a defining role in design. Whether round, straight-edged, flat, or particularly minimalist: the shape of the rosette significantly influences the overall appearance of the door.

Flat or minimalist escutcheons are frequently used in modern interior design concepts. GRIFFWERK, for example, describes PIATTA S door handles with flat escutcheons and also lists technical features such as PRONTO-FIX quick-mounting with a locking mechanism. 

The specifications should therefore state which rosette shape is desired. Otherwise, a technically compatible but visually different Fitting may be offered.

A possible wording:

“Rose and escutcheon set with round/straight-edged escutcheons, flat design, compatible with the selected Type of locking and the approved sample.”

The finish determines the appearance, feel, and maintenance requirements of a door fitting. Terms such as “stainless steel,” “black,” or “matt” are often insufficient because they can vary depending on the door fitting manufacturer and product line.

GRIFFWERK offers door handles in a variety of finishes. Product pages list options such as satin stainless steel or graphite black; for the R8 ONE series, finishes include Velvet grey, graphite black, Cashmere grey, and Silk white, among others. 

For architects, the finish is a design detail with a significant impact. It should complement the door leaf, frame, wall color, glass, fittings from other trades, and the overall material concept. In hotels, offices, or apartment buildings, it is also important how durable and easy to maintain the finish is in everyday use.

Therefore, the specifications should not simply state “Stainless steel” or “Black,” but rather a clear surface standard:

“Graphite black matt / Satin stainless steel finish, as per the sample and approved design line.”

The installation type affects stability, appearance, serviceability, and installation time. Especially for larger projects, it is important that fittings can be installed consistently, securely, and in accordance with the manufacturer’s specifications.

For door handles, GRIFFWERK highlights, among other features, its “Professional Screw-on System” with invisible fasteners, a maintenance-free friction bearing, counter-rotating M4 fasteners, a handle mounted on a fixed-rotation bearing, and retaining springs on both sides. 

For smart2lock and Piatta, GRIFFWERK also describes solutions that fit conventional standard door locks; for Piatta with smart2lock, quick installation via Smart-Klipp is also described. 

For the specifications, this means: Installation should not be left open-ended. A possible wording is:

“Installation according to the manufacturer’s instructions, including an installation kit, mounting hardware, and accessories, compatible with the door leaf, lock, and hardware series.”

Depending on the model and version, door handles may be direction-specific. Product pages often distinguish between L, R, or L/R. For example, with the R8 ONE without escutcheon from GRIFFWERK, the direction is specified for each product. 

The request for proposals should therefore be clear about whether a fitting is intended for left, right, or both sides. This information is best documented in the door list. This prevents incorrect orders and ensures that the correct fittings are available on the construction site.

A sensible way to phrase this in the specifications:

“Direction as per the door list; observe DIN left/DIN right specifications; supply the corresponding product variant.”

A door fitting set is supplied with more than just the visible handle. Depending on the model, it may also be supplied with rosettes, a mounting kit, fastening hardware, an emergency release pin, an escutcheon, or other accessories.

If this information is missing from the specifications, it may be unclear which parts are included in the bid. This can lead to delays or additional costs on the construction site.

Therefore, the request for proposals should explicitly specify the scope of delivery:

“Delivery includes a pair of door handles, rosettes, a mounting kit, fastening hardware, and any necessary accessories. For WC or smart2lock models, this includes an emergency release pin as specified by the manufacturer.”

smart2lock is a solution for any room where privacy is important—not just the bathroom and WC. The locking mechanism is integrated into the Handle. 

The advantage lies in the streamlined door design: a traditional Escutcheon is not required. The door surface appears cleaner, with the focus on the Handle. At the same time, the lock remains easy to operate.

Important for RFPs: smart2lock should not be described merely as a “lockable door handle.” A clear technical and design-oriented description is preferable:

“Door handle set with integrated locking mechanism in the handle, without a traditional escutcheon, suitable for standard Mortice locks, with emergency release, design as per samples.”

The ONE technology is characterized by an exceptionally minimalist door design. The handle is mounted directly on the door leaf without a traditional rosette. When combined with smart2lock, the locking mechanism can be integrated into the handle shank, so that none of the additional escutcheons are visible.

GRIFFWERK offers door handle sets without escutcheon with the R8 ONE and AVUS ONE models. The R8 ONE is available with smart2lock, various finishes, and for door thicknesses ranging from 38 to 45 mm. 

This design can be appealing for high-end interior design because it gives the door surface a clearer, more understated look. It helps maintain a clear, consistent design aesthetic, particularly with flush-mounted doors, Minimalist interior concepts, or high-end residential and commercial spaces.

Such a solution should be explicitly described in the specifications. The note “Supply door handles” is not sufficient. Better:

“Door handle set without escutcheon, handle body mounted directly on the door leaf, locking mechanism as per specification, finish as per samples provided; verify technical compatibility with the door leaf and lock prior to installation.”

Decisions about door fittings are often made late in the process. This is risky, because door fittings are permanently visible and a constant presence in daily use. Their form, finish, and feel shape the perception of a room more than their size might suggest.

Early sampling helps avoid the need for later adjustments. Architects, planners, and developers should make it clear before the final call for bids which design line will be used, which Finish has been approved, which rosette shape is desired, and which types of locking are required in which rooms.

This is particularly relevant for developers. In apartment buildings, residential complexes, or serial projects, clear sample selection ensures standardization. Special requests can be better managed, reorders become easier, and the building achieves a uniform appearance.

For architects, sample selection is important for ensuring design quality. Especially when the specifications permit “or equivalent,” it should be clear which characteristics must be equivalent: Form, Finish, rosette type, usage class, installation quality, and locking function.