What Are Architectural Specifications?

Architectural specifications are written documents that describe the materials, installation standards, product types, and performance criteria required to complete a construction project. While architectural drawings show the layout and quantity of components, specifications define the quality and execution of those components.

Specifications are a core part of the contract documents. Alongside drawings and general conditions, they provide legal and technical standards for the contractor to follow. In practice, specifications serve multiple functions: they communicate design intent, enforce building codes, guide material selection, and reduce ambiguity in the construction process.

Specifications are not optional. They are used in public and private projects alike and are typically issued during the Construction Documents phase. They may be reviewed by permitting authorities, consultants, contractors, and subcontractors, and often determine how the project is priced and constructed.

How Specifications Fit Into the Project Lifecycle

Specifications evolve in detail as the project progresses. They may start as informal narratives and end as structured technical manuals. By the time construction begins, the specifications are part of the official bid set or construction contract.

Specifications are updated through addenda or revisions when design changes occur during construction.

Types of Architectural Specifications

Specifications may be organized by the method of describing the work. Each approach allocates different levels of responsibility to the architect and contractor.

Proprietary Specifications

Proprietary specifications name specific manufacturers, models, or product lines required for construction. This type of specification is often used when aesthetic consistency, system compatibility, or known performance are essential.

Proprietary specs may be either:

• Closed: No substitutions are permitted. The contractor must provide the exact product specified.

• Open: Alternate products may be submitted for approval if they are functionally equivalent and meet the same standards.

Examples of Closed Proprietary Specifications

Closed proprietary specs are common when performance history matters, such as:

• Matching existing building systems

• Meeting strict warranty requirements

• Aligning with owner's facility standards

• Preserving design intent in high-visibility elements

However, this approach may reduce bid competition, raise material costs, or delay schedules due to lead times or limited distribution.

In public-sector projects, closed proprietary specifications are often restricted by law to encourage competitive bidding. When allowed, justification or “basis-of-design” language may be required.

Performance Specifications

These define the required results, such as fire resistance, energy efficiency, or structural strength, without prescribing the exact product or method. This allows contractors to choose solutions that meet or exceed the required outcomes.

Performance specifications are useful when innovation or flexibility is desired, but they must include clear metrics and testing standards to ensure enforcement.

Descriptive Specifications

These describe the characteristics of materials, components, and installation without naming a brand. For example, a descriptive spec may require wood of a certain species, grain, thickness, and finish. This method places full responsibility on the specifier to define requirements thoroughly.

Reference Specifications

These point to existing industry standards, such as ASTM, ANSI, or UL, to define quality or performance. Referencing third-party standards can improve clarity, avoid redundancy, and ensure up-to-date practices without rewriting technical content.

MasterFormat and Section Organization

Most architectural specifications in the United States follow MasterFormat, a standardized organizational system developed by the Construction Specifications Institute (CSI). MasterFormat divides construction work into numbered divisions and sections for consistency and coordination.

Each division groups related trades or scopes. Specifications are written using a three-part format within each section.

Each section typically includes:

• Part 1 – General: Administrative requirements, submittals, quality assurance, mockups

• Part 2 – Products: Acceptable materials, manufacturers, finishes, and performance data

• Part 3 – Execution: Installation procedures, tolerances, field quality control, protection

This structure helps teams locate relevant information quickly and keeps documentation consistent across disciplines.

Who Writes Specifications?

Specification authorship depends on firm size, project complexity, and delivery method.

• In smaller firms, the project architect or job captain often writes or assembles specifications using templates or software.

• In larger firms, technical architects or dedicated specifiers lead this task.

• On complex projects, consultants may be hired to develop and coordinate the full specification set.

Specification writers need to interpret the design intent accurately and translate it into enforceable language. They must also stay current on product certifications, sustainability requirements, and industry standards.

Software tools such as BSD SpecLink, Deltek Specpoint, and e-SPECS are commonly used to manage formatting and database content. These platforms help with consistency, cross-referencing, and version control.

Coordinating Drawings and Specifications

Drawings and specifications must align. If the two contradict each other, it can create confusion, delays, or disputes during construction.

For example, a door may be shown on drawings with a particular hardware set, but the specifications list a different set. Or a wall type may be detailed with specific fire resistance, while the specs refer to an outdated system. These mismatches create risk and erode trust.

Spec coordination is often included in internal QA/QC workflows. Reviews may occur during Construction Documents or prior to bid issuance. On BIM-enabled projects, some firms link specifications directly to model elements using structured parameters.

Specifications as Contract Documents

Architectural specifications are legally binding components of the construction contract. Alongside the drawings and general conditions, they are enforceable by the owner and may be referenced in disputes, claims, or audits.

If there is a conflict between the drawings and specifications, the governing priority is typically defined in the general conditions. In some contracts, the specification takes precedence. In others, the more stringent requirement applies.

To reduce risk, language in specifications must be:

• Consistent and specific

• Based on measurable criteria

• Aligned with referenced standards and codes

Terms like “shall,” “must,” and “provide” create binding obligations. Terms like “as required,” “as selected,” or “per architect” introduce ambiguity and should be minimized.

Best Practices in Specification Writing

Specification errors can lead to cost overruns, delays, or legal liability. For this reason, many firms treat specification writing as a parallel discipline to design and modeling.

Frequently Asked Questions

What are architectural specifications?

Architectural specifications are written documents that describe the materials, installation standards, product types, and performance criteria required to complete a construction project. While drawings show layout and quantity, specifications define quality and execution.

When are specifications written?

Specifications evolve through the project lifecycle. Schematic Design produces narrative outlines. Design Development expands them with manufacturers and performance goals. Construction Documents produces the full technical specifications as part of the bid set. Specifications are then used during Construction for submittal review, quality control, and scope management.

Who writes architectural specifications?

In smaller firms, the project architect or job captain writes or assembles specifications using templates or software. Larger firms have technical architects or dedicated specifiers. Complex projects may bring in a specification consultant. Specification writers translate design intent into enforceable language and stay current on product certifications and standards.

What is MasterFormat?

MasterFormat is the standardized organizational system for construction specifications in the United States, developed by the Construction Specifications Institute (CSI). It divides construction work into numbered divisions and sections (such as Division 03 Concrete, Division 08 Openings, Division 09 Finishes). Each section follows a three-part format: Part 1 General, Part 2 Products, Part 3 Execution.

What are the different types of architectural specifications?

Four main types: Proprietary (names specific manufacturers and models, can be closed or open), Performance (defines required outcomes without prescribing the product), Descriptive (defines material characteristics without naming a brand), and Reference (points to existing standards like ASTM, ANSI, or UL).

What is the difference between closed and open proprietary specifications?

Closed proprietary specs require the exact product specified with no substitutions. Open proprietary specs allow alternate products if they are functionally equivalent and meet the same standards. Closed specs reduce variability but may also reduce bid competition. Open specs balance design intent with procurement flexibility.

How do specifications relate to drawings?

Drawings and specifications must align. If they conflict, the project’s general conditions typically define which controls. Specs usually take precedence for product information; drawings take precedence for layout. Coordination errors between drawings and specs are a common source of RFIs and change orders.

What software is used to write specifications?

Common platforms include BSD SpecLink, Deltek Specpoint, and e-SPECS. These tools help with consistency, cross-referencing, version control, and database content management. Some firms link specifications directly to BIM model elements using structured parameters.

Further Resources

• Everything You Ever Wanted to Know About Construction Documents. The full reference for the broader CD package that contains specifications.

• Best Practices during Construction Documentation. The phase where specifications are finalized.

• Design Development Phase and Coordinating Around the Revit Model. Specifications expand from narratives to detailed text during DD.

• Architectural Room Data Sheets Explained. Room Data Sheets often inform the specification.

• The Door and Window Schedule Process Explained. Door and window specifications connect to the schedule.

• The Ultimate Guide to How to Specify Door Hardware. A specialized companion guide for door hardware specifications.

• How to Close Out a Revit Model During Construction Administration. Specification compliance is verified during Construction Administration.

• The Architect’s Guide to Construction Administration. Where specifications are referenced during construction.

• FF&E: A Comprehensive Guide. FF&E specifications are a common component of architectural spec packages.