Solar As-Built Drawings: AHJ Requirements and Sample

As-built drawings are the last design job on a solar project. The job is not done when the last module is clamped down. It is done when the paperwork matches the roof. If the drawings are wrong, the customer’s system can wait weeks for sign-off.

Last updated: November 2026. SurgePV publishes this post and sells solar design software.

Delays cost money. A solar software vendor quoted in pv magazine USA (12 March 2025) said permitting delays can add as much as $4,500 per project; that figure is about permitting, not about drawings alone. But every drawing set that gets sent back adds to the wait.

AHJ means authority having jurisdiction, the local office that approves and inspects permits. SLD means single line diagram, a simple drawing of how the system is wired. This guide covers what an as-built is, what AHJs and utilities may ask for, and what to put in the package. It also gives a sample sheet list, a way to make as-builts from the permit design, and common reasons a package is sent back. For the short definition, see our as-built drawings glossary entry.

In this guide:

• What as-built drawings are, and how they differ from permit drawings
• Why AHJs and utilities ask for them
• What a complete as-built package holds, and a sample sheet list
• How to make as-builts from the original design
• How to capture field markups
• Common reasons a package is sent back
• Why the “optional” as-built is a bad idea

What Are As-Built Drawings for Solar Projects?

As-built drawings are the final, corrected version of the project drawings. They show the solar system as installed, not as designed. Every rerouted conduit run, swapped module and moved disconnect appears on the set.

The idea comes from general construction. A designer draws the plan, the crew builds it, and the real site always wins. A rafter sits 2 inches off plan. The attic forces the conduit to the east wall instead of the south wall. The permit set says one thing and the roof says another.

As-builts reconcile the two. A solar set usually has 3 core documents:

1. Site plan with final array layout. It shows module positions, setbacks, ridge and eave distances, and obstructions as measured on the finished roof.
2. Single line diagram (SLD). It shows final strings, inverter model, breaker sizes, disconnect locations and the utility connection point.
3. Equipment and label schedule. It lists final module and inverter models, serial numbers where needed, label text and label locations.

The terms “as-built” and “record drawings” are often used for the same thing. Some teams use “as-built” for the field markups and “record drawings” for the clean final set made from them. On a small rooftop job, one set usually does both jobs.

As-Built vs Permit Drawings

Solar permit drawings are the plans you send with the permit application. They show the planned design, so an AHJ can check it before work starts. As-builts show the finished system.

If the crew changed nothing, the two sets can match. If the crew changed anything, the as-builts must show it. For help with the permit set itself, see our guide to permit-ready drawings and our notes on solar permit expediting.

The permission to operate step is where as-builts matter for the utility. A utility may compare your final SLD with your interconnection application. If the installed inverter or system size is different, the request can stall until the paperwork matches.

Why AHJs and Utilities Ask for As-Builts

AHJs and utilities ask for as-builts for 2 reasons: building safety and grid safety. The inspector needs to check that the installed system meets code. The utility needs to know what is connecting to its network.

The AHJ’s view

The AHJ approved a permit for one specific design. If the crew changed something that matters, such as wire sizes, breaker ratings, module count or equipment locations, the approval may no longer match the install. The as-built set closes that gap. It tells the inspector what changed and shows that the change still meets code.

Whether you must submit them depends on the AHJ. Some will not close a permit until the drawings match the install. Ask for the closeout checklist when you apply. If someone else does your permit design, agree on who sends documents to the AHJ, who answers comments, and who records field changes.

The utility’s view

The interconnection agreement names a specific system: an inverter, an AC capacity and a connection point. A field swap changes what connects to the grid. An as-built SLD lets the utility check that the installed system matches the one it approved. If it does not match, you may need to update the interconnection application before the utility will energize the system.

Accurate documents and faster approvals

Automated permitting shows why clean documents matter. A National Renewable Energy Laboratory (NREL) pilot study (1 February 2022) covered five jurisdictions in Arizona and California. It found that projects submitted through SolarAPP+ were installed and inspected on average 12 business days faster than projects on the traditional process.

A later US Department of Energy article (3 May 2023) reports an NREL annual report. It says SolarAPP+ had removed 134,000 days of delay by the end of 2022. It also says projects permitted through it were about 29% less likely to fail inspections.

The Interstate Renewable Energy Council (IREC) describes SolarAPP+ as standardized plan review software that runs compliance checks. SolarAPP+ is about permits, not as-builts. But the lesson carries over: clear, accurate documents move faster.

The figures above come from the NREL pilot study, the US Department of Energy article and the pv magazine USA piece linked in this section and the introduction. The $4,500 is one vendor’s estimate for permitting delays, not an as-built figure.

What to Include in a Solar As-Built Package

A residential as-built package should cover these 8 elements. Use the list as a checklist before you submit.

A sample sheet list

Here is one way to lay out the sheets. Your AHJ may ask for a different order or extra sheets.

• Cover sheet with project address, system size, revision block and change list
• Site plan or roof plan with final module positions and distances
• Single line diagram with final strings, breakers and disconnects
• Conduit and wire route sheet
• Equipment and wire schedule
• Label and placard sheet
• Photo sheets, grouped by location

Be careful with labels. Label text must match the National Electrical Code (NEC) edition your AHJ enforces. NFPA lists 2026 as the current edition of NFPA 70 and 2023 as the one before it, and local adoption differs. Do not copy label text from an old template without checking.

Three gaps that cause trouble

The SLD. Crews swap inverters or change string counts, and nobody updates the SLD. The inspector reads breaker sizes off the drawing and compares them with the panel. Any mismatch can fail the inspection.

The label sheet. Labels need the final equipment data and the right code edition. A label sheet built for an older code can be wrong for your job.

The photo set. Some AHJs want photos of work that will be hidden, such as attic conduit and junction box connections. Take them during the install. Going back later is slow.

Commercial projects

Commercial as-builts often add structural attachment details, string maps, monitoring points and a commissioning report. IEC 62446-1:2016 defines the information and documents to hand over to a customer after a grid-connected PV system is installed. It also describes commissioning tests and inspection. Check your contract to see if it asks for this standard.

For large jobs, treat the as-built package as one part of the solar handover pack, the full set of documents that passes the project to the owner or the operations and maintenance (O&M) provider.

How to Produce As-Built Drawings From the Original Design

The fastest as-built is a marked-up copy of your permit set, not a new drawing. Most of the work was done at design time. You only need to record what changed.

1. Start from the approved set. Open the final approved version in your solar PV design software. Save it as a new revision, such as “As-Built Rev A”, with today’s date.
2. Apply the field markups. Move each changed item: module positions, conduit routes and swapped equipment. Do not redraw the sheet.
3. Update the SLD. Change string counts, inverter model and breaker sizes to match the install. Check wire sizes and voltage drop again for the final setup.
4. Regenerate the BOM. Output the bill of materials from the updated design, so quantities match the roof.
5. Update the labels. Use the final equipment models and the code edition your AHJ enforces.
6. Add the revision block. Fill in revision letter, date, a short list of changes and initials. Some AHJs reject sets with no revision history.
7. Attach photos. Group them by location: array, attic, panel, inverter and labels.
8. Export and submit. Send the package with the inspection request or the PTO application, in the order your AHJ or utility asks for.

Design tools help when the roof model, string layout and BOM sit in one place. SurgePV covers roof modeling, layout, shading analysis, electrical workflow support and bill-of-materials output. Ask for a guided demo to see how it handles a design change. A formal solar design revision process and drawing revision control also keep the revision history clean.

Good upstream work means fewer changes in the field. Careful shade and obstruction modeling with solar shadow analysis software can cut surprise layout moves, so there are fewer markups to transfer later.

How to Capture Field Markups

Good as-builts depend on good field notes. The design team can only draw what the crew recorded.

Many crews still use a printed plan set marked with a pen. This works, but paper gets wet, notes are hard to read, and the set can sit in a truck for days. These methods are more reliable, starting with the best:

• Same-day photo markups. Take a wide photo for context and a close photo for detail of each change. Upload them to the shared project folder before the crew leaves.
• Digital redline on a tablet. Mark the PDF with a stylus. The notes are easy to read and sync right away.
• Measurements from fixed points. Record distances from the ridge, eave, parapet or panel corner. “Near the vent” is not a markup. “Conduit exits attic 4 ft 6 in from west wall” is.
• Voice notes. A 30-second memo that explains why a run changed can save a phone call later.
• Serial numbers. Photograph module and inverter serial stickers before the equipment goes up. You cannot read them from the ground.

One rule matters most: capture details before the crew leaves the site. Details written down on site are accurate. Details rebuilt from memory weeks later are guesses.

Tie the markups to the project’s revision history. Then an inspector, utility or service tech can see what changed and when. This is the same habit as a good solar commissioning checklist: keep records in the field, not at a desk.

Common Reasons an As-Built Package Is Sent Back

Reviewers can send a package back for gaps like these. Here are 7, each with a fix. This list is practical guidance. No public data ranks the reasons by how often they happen.

Before you submit, walk the drawings against the photo set. Confirm each model number and check the revision block. The checks in our solar inspection preparation checklist work well for this. For utility-side issues, see our solar interconnection application guide.

Why the “Optional” As-Built Is a Bad Idea

Some installers say, “If nothing changed, you don’t need as-builts.” That is rarely true, and the as-built has a second job. It is the permanent record for the next person who works on the system: a service tech, a roofer, a home buyer’s inspector or an O&M provider. Without it, each future visit starts with discovery work. Some AHJs accept the approved permit set stamped “as-built” with a signed statement that nothing changed. That statement is a legal one, so sign it only if the roof matches the plans. Otherwise, mark up the set, list the changes and submit it. An hour of redlining costs less than a failed inspection, a delayed PTO or a return visit to photograph an attic.

How to Buy Solar As-Built Drawing Services

Give the provider your approved design set, requests for information (RFIs), change orders, redlines, equipment swaps, field measurements, test records and commissioning comments. Also give them the closeout rules from the AHJ or the owner. Ask for revised layouts and diagrams, equipment and cable schedules, final revision status, native files, a change register, and a list of items nobody could check in the field.

For quality checks, trace each approved field change into every drawing, calculation, schedule, label and equipment reference it touches. Drafting as-builts records the evidence you supply. It does not prove that hidden work, install quality, code compliance or exact field conditions are right. A qualified person has to check and document those.

Disclosure: SurgePV is promoting Heaven Designs through a commercial relationship. Apply the same evidence traceability, field-verification, revision-control, and closeout review to every provider.

Review the Heaven Designs post-design service, visit the Heaven Designs website, and request a post-design sample before seeking a quote.

Conclusion

As-built drawings are the last design deliverable on a solar project. They are a mark-up pass over documents you already have, fed by notes your crew took on the day.

Three steps to take this week:

• Check your last 10 completed projects. Pull the permit set and the photos. Count how many installs match the drawings exactly. If many do not, fix your as-built process.
• Set a rule for as-builts. Do not request inspection until an as-built revision is done and reviewed. Write the markup steps into your install procedure, and give crews a tablet or photo checklist.
• Keep your design data in one place. If the roof model, strings, BOM and labels sit in four tools, as-builts will stay hard. A cloud solar software platform like SurgePV keeps layout, electrical workflow support and BOM output together, and solar proposal software carries the same data from first contact. Book a Free Demo to see it.

Frequently Asked Questions

What are as-built drawings in solar?

As-built drawings are the final drawings for a solar system, updated to show it exactly as built. They record every field change from the permit plans, such as moved modules, rerouted conduit, swapped equipment and moved disconnects. An AHJ may use them to close the permit. A utility may use them before it gives permission to operate.

Are as-built drawings required for solar permits?

It depends on your AHJ and your utility. Some ask for as-builts when the install differs from the approved plans. Some utilities ask for an as-built single line diagram and site plan before permission to operate. Ask for the closeout checklist when you apply for the permit.

What is the difference between as-built and record drawings?

People often use the two terms for the same thing. Some teams use as-built for the field markups made by the installer. They use record drawings for the clean final set made from those markups. On a small rooftop job, one set often does both jobs.

How long after installation should as-builts be completed?

Do the markups on site, on the day of the work, while the crew remembers each change. Finish the drawing set before you ask for the final inspection. Details such as exact conduit runs and wire lengths are easy to forget.

What causes as-built drawings to be rejected?

A drawing that does not match the installed system is the main risk. Examples are the wrong module model, missing rapid shutdown device locations, an old single line diagram, missing label details, and conduit routes that do not match the photos. Missing signatures and revision dates can also cause a rejection.

Can I use the original permit drawings as as-builts?

Only if the system matches the permit plans exactly, with no field changes. Some AHJs accept the approved plan set stamped as-built with a signed statement. Others want a revised set with a revision cloud around each change and an updated revision table. Check the AHJ closeout list first.

What should a solar as-built package include?

A residential package should include the final array layout, an updated single line diagram, conduit and wire routes with sizes, equipment and label locations, grounding details, label photos or drawings, and the final bill of materials. Commercial jobs may add structural attachments, string maps and monitoring points.