What Are Construction Documents? A Homeowner's Guide
Construction documents, often called CDs, are the detailed drawings and written specifications that tell a contractor exactly how to build your home and give the building department what it needs to issue a permit. They are the fourth phase of the standard design process and the most technical, translating your approved design into precise, buildable instructions. A complete, coordinated set is one of the best investments you can make in a smooth, on-budget project.
What construction documents are for
CDs serve three jobs at once:
- Pricing: Contractors use them to prepare accurate bids. The more complete the set, the tighter and more comparable the numbers.
- Permitting: Building departments review them for code compliance before issuing a permit.
- Building: Crews use them daily on site as the instruction manual for the work.
Because so much rides on them, CDs have to be thorough and internally consistent. Gaps and contradictions become questions, change orders, and cost overruns during construction.
What's in a construction document set
A residential CD set combines drawings and written specifications. The exact contents scale with the project, but a typical set includes:
| Component | What it covers |
|---|---|
| Cover sheet & general notes | Sheet index, code data, project info |
| Site plan | The home on its lot: setbacks, grading, utilities |
| Floor plans | Dimensioned layout of each level |
| Elevations | Exterior appearance on all sides |
| Building sections | Vertical cuts showing structure and heights |
| Details | Close-ups of specific conditions (eaves, stairs, waterproofing) |
| Schedules | Tables for doors, windows, and finishes |
| Structural drawings | Foundations, framing, beams (engineer-stamped as needed) |
| Electrical plans | Outlets, lighting, panels, circuits |
| Plumbing plans | Fixtures, supply, and waste lines |
| Mechanical (HVAC) plans | Heating, cooling, ventilation |
| Specifications | Written descriptions of materials, quality, and workmanship |
Drawings show where and how big; specifications describe what quality and which product. Together they leave little to guesswork.
How CDs differ from earlier drawings
It helps to see where CDs sit in the design process. Schematic Design drawings are loose sketches meant to test ideas. Design Development drawings lock in sizes, materials, and systems. Construction Documents take that settled design and add the technical depth a contractor and inspector require: dimensions, structural details, connection details, code notes, schedules, and specifications.
In other words, DD answers what the house is; CDs answer exactly how to build it. This is why the CD phase involves the most drafting hours of any phase.
How construction documents are priced
Because CDs are drawing-intensive, they are often priced separately from concept work. Common approaches:
- Per square foot: Roughly $1-5 per square foot of the home, scaling with complexity and detail.
- Per sheet: About $35-180 per sheet, useful for smaller or add-on scopes.
- As part of a full-service fee: Rolled into an overall design fee, which may be structured as a percentage of construction cost (commonly 8-20%) or a fixed amount (full design engagements often range from about $2,000 to $80,000 or more).
The right structure depends on your project's size and how much other service you are buying. Ask your designer to explain what the CD fee includes, particularly which consultant drawings (structural, mechanical, energy) are part of the set and which are extra.
Why a complete set saves money
It is tempting to view CDs as a cost to minimize. In practice, skimping here tends to cost more later. Here is why a thorough set pays off:
- Tighter bids. When contractors can see exactly what is required, they price precisely instead of padding for uncertainty. Thin drawings invite either inflated bids or dangerously low ones that balloon with change orders.
- Apples-to-apples comparison. A complete set lets you compare bids fairly, because every contractor is pricing the same scope.
- Fewer change orders. Most change orders trace back to missing or ambiguous information. Detailed CDs answer questions before they arise on site, where answers are most expensive.
- Smoother permitting. Complete, code-aware drawings pass plan review with fewer comments and revision cycles.
- A record you can hold people to. When the built work does not match the drawings, the CDs are the reference that settles it.
The savings from fewer change orders and better bids typically dwarf the incremental cost of a well-detailed set.
What to look for in your set
You do not have to check every line, but as the homeowner you can and should confirm the big picture:
- Completeness: Are all the sheets present, floor plans, elevations, sections, details, schedules, and the relevant structural and systems sheets?
- Consistency: Do the plans, elevations, and schedules agree with each other? A window size on the plan should match the window schedule.
- Your selections: Are the materials and finishes you chose reflected in the specifications and schedules?
- Clarity: Can you follow how features cross-reference between sheets?
If anything looks incomplete or contradictory, ask. Catching it in the documents is far cheaper than catching it in the field.
Getting a set you can build from
A strong CD set is the product of the phases before it: clear programming, a well-tested schematic design, and thorough design development. When those steps are done well, the CDs come together cleanly and the whole set holds up under a contractor's and inspector's scrutiny.
If you are preparing to build or add on, working with a vetted local designer who produces complete, coordinated construction documents is one of the surest ways to get accurate bids, a clean permit, and a project that runs the way it was drawn.