What Do SD, DD & CD Stand For In Construction?
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Construction is a culmination of different disciplines coming together to create an infrastructure that is functional and aesthetic at the same time.
Table of Contents:
Pre-Design: Research and Space Planning
Creating structures that are habitable involves a lengthy process, one that cannot afford any room for errors.
Before actual construction begins for a structure, it has to go through cycles of amendments and changes, typically done over software such as CAD.
Schematic Design (SD), Design Development (DD) and Construction Documentation (CD) are stages in CAD drafting to ensure that the budget and vision of client and architects reach an arrangement that can be well executed.
The SD, DD and CD construction document sets cover the construction design documentation phase.
Schematic Design Sets – Defining Look and Feel
A project begins with conceptual design and then moves into schematic design (SD), wherein the concepts are translated into physical drawings.
These design development sets change many times to accommodate project requirements, client-requested modifications, and licensing authority guidelines before becoming approved for construction.
Schematic design is fairly conceptual in nature; it doesn’t go into much detail. The design will lay out the site and interior spaces, and develop a basic exterior.
The deliverables that a design professional will prepare in this phase include preliminary drawings such as floor plans, elevations, and a site plan, if applicable. You may also see some sketches, or you could ask your architect to do some computer renderings (usually this would be another add-on service) to help you get a sense of how the spaces will look and feel.
For the most part, the design won’t include the final materials, so if you do get sketches or renderings, keep in mind that what they’re showing isn’t necessarily set in stone.
Many times, the designer and consulting engineers will prepare a narrative as a part of the schematic design. This broadly describes the project and what kinds of systems (e.g., HVAC, Electrical, M&E) the building will use. It also helps the team estimate the project costs.
Design Development Sets – Refining the Design
During this phase, the designer advances the design significantly. The main goal of this phase is to define and develop the important aspects of the project.
The exterior, interior layouts, room sizes, and materials are more fully designed. The engineers will further develop the HVAC, plumbing, and electrical systems.
The deliverable is a much more detailed set of drawings than in the schematic phase and a specification book, which can be thought of as written instructions for the drawings.
This book will specify the materials that have been selected, and provide things like installation instructions, quality control requirements, and other technical information. An updated cost estimate is usually produced as well.
Construction Document Sets – It’s All In the Details
All necessary technical information is finalized. The final set of drawings and specifications will include the information that’s required to obtain a building permit from whichever local authority has jurisdiction (e.g., the city or county).
The architect will typically handle the permitting process for you. If the authority has questions, requires additional information, or requests changes/corrections to the drawings (all of these scenarios are common), your architect will take care of it.
The deliverable in this phase is a complete set of drawings and specifications, referred to as the construction documents. These will be submitted for the permit and given to contractors to develop bids/quotes for the work. Again, an updated cost estimate is usually produced as well.
All these elements and phases come together to formulate a project from start to finish.
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