Almost every remodel opens with the same optimistic question: can we skip the measuring and work from the plans we already have? Usually the answer is no, and not because designers enjoy measuring houses. Everything downstream — the bids, the engineering, the permit set, the schedule — is drawn against a description of a building that already exists. If the description is wrong, so is everything built on top of it.
RDD Solutions is a residential design and drafting firm. We are not an architecture firm and we do not build. We produce the drawings a building department reviews and a contractor prices from, and on a house of any age the first sheet in that set is a measured record of what is actually there.
What an As-Built Drawing Set Actually Is
An as-built set is a scaled, dimensioned drawing of a building as it stands today. Not as it was designed, not as the permit record describes it. As it is, with the wall the second owner moved and the window the third owner filled in. For a typical single-family remodel it contains:
- Floor plans of every level, dimensioned room by room, with wall thicknesses, openings and the locations of fixtures, panels and mechanical equipment.
- Exterior elevations, all four sides, with window and door heights, roof pitches, eave and ridge heights and the grade line at the building.
- Building sections showing floor-to-ceiling and floor-to-floor heights and how the levels actually relate.
- A roof plan with slopes, ridges, valleys and existing penetrations.
- A site plan: setbacks, footprint, hardscape, existing coverage and the site features that matter to review.
- Existing conditions notes — what was verified, what was inaccessible, what is assumed. That last item separates a professional as-built from a tidy-looking guess.
The set proposes nothing. Its only job is to be true.
As-Built, Original Drawing, Assessor’s Sketch
These three get conflated constantly. An original construction drawing is what was submitted for permit when the house was built or last permitted, so it records an intention at a moment in time. Field changes during construction were common and rarely redrawn, and the set knows nothing about what happened afterward. An assessor’s sketch is a tax record supporting a valuation: an outline and an approximate square footage, with no interior dimensions worth trusting, no heights, no wall types, no verification. An as-built drawing is a present-tense measurement taken by someone standing in the building, and it is the only one of the three that can be checked, because the building is right there to check it against.
Why the Original Plans Are Usually Missing or Wrong
Take the Monterey Peninsula as the worked example. Most houses worth remodeling in Monterey, Pacific Grove, Carmel and Pebble Beach were built between the 1920s and the 1960s — sixty to a hundred years of ownership, and ownership changes buildings.
Three things tend to be true of a house that age. The original drawings often do not exist, because small residential permit records from that era were not consistently retained and were rarely detailed to begin with. Where drawings survive, the building has drifted from them: a wall came out, a porch was enclosed, a garage became a family room. Some of that work was permitted and some was not, and undocumented work by previous owners is the norm rather than the exception. And nothing about the house is square — framing settles, foundations move, and additions meet original structure at angles that were approximate the day they were built. Rooms that read as rectangles on a sketch measure as trapezoids, by an inch or two per wall, which is enough to matter when cabinetry, a stair or a structural opening has to fit.
None of this is a Peninsula peculiarity. It happens to any building stock of that age; the Peninsula simply has an unusual concentration of it.
How the Measured Survey Works
The field visit is more ordinary than people expect. A designer walks the house with a laser distance meter, a tape and a camera, recording dimensions room by room and opening by opening, then works the exterior for elevations, heights and grade and the parcel for setbacks. Photographs are taken throughout, because half the questions that come up three weeks later are answered by a photo instead of a return trip.
What it asks of you:
- Access to every space, including the ones nobody enjoys showing — the garage, the crawlspace hatch, the attic access, the room behind the boxes. Skipped rooms become assumptions, and assumptions become corrections.
- Time on site. A modest single-story house is quick; a multi-level house with three generations of additions is not. You need not be present throughout, but someone has to let us into everything.
- Whatever paperwork you have — old plans, permit records, a survey, the inspection report from when you bought. None of it is relied on unverified, but it tells us where to look harder.
- Honesty about undocumented work. If a previous owner enclosed the patio without a permit, we would rather know on day one than have plan check find it. It is a solvable problem early and an expensive one late.
What comes back is worth reading. Clients regularly discover the house is a few hundred square feet different from what they believed, that a wall they assumed was structural is not, or that a setback is tighter than the listing implied.
What Goes Wrong When You Skip It
Bids that cannot be compared. Without a dimensioned existing-conditions set, every contractor is pricing a slightly different building. One assumes the wall stays, one assumes it goes, one carries a contingency and one does not. You end up choosing between four numbers describing four projects, and the lowest is usually just the one that assumed the most.
Plan-check corrections. Reviewers check proposed work against existing conditions. When those conditions do not match the building, or are too thin to check, the set comes back with corrections, and every correction round is a resubmittal and a new place in the queue. Permit timelines stretch from rework far more often than from a slow department.
Discoveries mid-construction. A wall opens and there is a beam nobody drew, a duct through the space the new stair needs, plumbing where the island was going. Each is a change order at construction pricing, decided under time pressure, with the crew standing still.
Structural surprises. Whether a wall carries load, how an addition was tied into the original framing, and what the foundation actually is are not questions a floor plan sketch answers. Your structural engineer calculates against the existing structure, and a wrong description produces calculations wrong in the same direction. On a home addition, especially a second story, that is the most consequential unknown in the project.
How As-Builts Serve Permitting
Building departments do not review your remodel in isolation. They review the change: existing versus proposed, and both have to be on the sheets. Existing conditioned floor area is what makes an addition a measurable number, which determines where it lands in the Title 24 energy tiers. Existing height and grade are what a proposed height is measured from. Existing setbacks and coverage are what a planner compares the proposal against, and on a nonconforming lot the existing building may carry rights that survive only if you can document what is there.
Local process makes the same point from other angles. In Monterey, architectural review is triggered by conditions rather than choice — among them a lot under 5,000 square feet, a slope over 15%, or a second-story addition — each one a measurement of the existing site and building. Story poles are required for construction greater than one story, installed at least 10 days before a decision — which only works if the existing height is right. In Pacific Grove, a tiered review reaching the Historic Resources Committee makes the existing building the subject of review rather than the backdrop.
Requirements and timelines described here were researched in September 2026 and are typical rather than guaranteed. Verify current requirements with the building department for your jurisdiction.
When You Genuinely Do Not Need a Full Set
There are real cases, and we would rather say so than sell measuring for its own sake. New construction on a bare lot has no existing building to record; a survey and site plan carry that weight. Cosmetic work in one room — cabinets, finishes and like-for-like fixture swaps that move nothing structural, mechanical or exterior — generally does not require a permit and rarely needs a measured set beyond the room itself. That is typical practice rather than a code citation, and it stops being true the moment a wall, a window or a fixture location moves. A recent, verified set may be usable if the house was documented in a permitted project and nothing has changed since, though we still field-verify the areas being touched. On a tightly bounded kitchen or bathroom project, the measured scope can often stop at that room and the structure and services around it.
What tips a project the other way is scope crossing a boundary: a wall coming out, a window moving, a fixture relocating, anything touching the exterior, anything adding floor area. At that point the existing building is part of the review, which is why a whole-house remodel essentially always starts here.
As-Built Drawing FAQs
What is an as-built drawing?
An as-built drawing is a scaled, dimensioned record of a building as it currently stands, produced by measuring it in the field. It typically includes floor plans, exterior elevations, sections, a roof plan and a site plan showing setbacks and footprint. Unlike an original construction drawing, it reflects every change made since the building was built, whether or not that work was permitted.
Can you use my original house plans instead of measuring?
We will start from them, but they get verified in the field before anything is drawn against them. Original plans record what was intended at the time of permit, not what was built or what has changed since, and on an older house undocumented alterations by previous owners are the norm. Existing drawings usually shorten the measuring visit; they do not replace it.
Do I need as-built drawings for a permit?
In practice, yes, for anything beyond cosmetic work. Building departments review the change from existing to proposed, so existing conditions have to appear on the sheets — existing floor area, height, grade, setbacks and coverage are all values the review is measured against. A set that cannot describe the existing building accurately tends to come back with corrections.
How long does the measuring visit take, and do I need to be there?
It depends on the size and complexity of the house and how many additions it has collected. Someone needs to provide access to every space, including the garage, attic access, crawlspace and utility areas, but you do not need to be present the whole time. Rooms that get skipped become assumptions, and assumptions are what turn into corrections later.
Is an assessor’s sketch or a listing floor plan good enough?
No. An assessor’s sketch is a tax record built to support a valuation, and a listing floor plan is a marketing document. Neither carries verified interior dimensions, wall types, heights or setbacks, and neither has been checked against the building. A plan set drawn from either is drawn against a description nobody confirmed.
Start With the House You Actually Have
Measuring is the one part of a project where being wrong is still cheap to fix. Contractors know it, which is part of why a good share of our work arrives through builders and why our plan sets for contractors start the same way. Tell us about the house and what you want to do with it, and we will tell you what the existing conditions work looks like for your project. Get in touch.