Guide

Car Build Sheet: What It Is and How to Make One

A build sheet is the one-page answer to "what have you done to it?" Here is what belongs on one, a worked example you can copy, and a way to stop maintaining it by hand.

By G-Dimension · Updated July 2026

What a build sheet actually is

A build sheet is a single organized document listing everything that has been done to a car: every modification, the brand and part number behind it, the specs that changed as a result, and the service history underneath it all. It is the difference between saying "it's built" and being able to show precisely what that means.

The term gets used two ways, and it is worth separating them before you go looking:

• A factory build sheet is the document the manufacturer produced when the car was assembled, listing the trim, options, and equipment codes it left the plant with. You look this up by VIN. It describes the car you started with.
• An enthusiast build sheet is the one you write. It describes what the car has become: the mods, the parts, the work, in order. This guide is about that one.

Enthusiasts reach for a build sheet at three moments, and each one wants slightly different things from it. At a car show, it goes on the windshield or a stand, and it needs to be scannable in ten seconds by someone walking past. When selling, it goes to the buyer, and it needs to be complete and backed by receipts, because that is what turns a list of claims into evidence. For yourself, it is the running record of what is on the car right now, which matters more than people expect the first time a shop asks what spring rate you are running and you cannot remember.

What goes on a build sheet

The failure mode of most build sheets is that they are a flat, unsorted list of parts. A reader cannot tell what matters, and the person who wrote it cannot tell what is missing. Grouping fixes both problems. These are the sections worth having.

Sections 1 to 5 are the build sheet proper: what the car is running. Sections 6 and 7 are what turn it into a record someone else can trust, and they are the ones people leave out.

1. Vehicle identity

Year, make, model, and trim, plus the chassis code if the community uses one, because that is how people actually search and talk. Add color, current mileage, and transmission type (automatic, manual, dual-clutch). Leave VIN and license plate off any copy that leaves your hands. They are not useful to a reader and they are worth something to the wrong one.

2. Power

Engine and drivetrain work: internals, forced induction, exhaust, intake, fuel system, cooling, tuning, and any engine management. If you have dyno figures, give the number, the wheel or crank basis, and the dyno it was run on. A bare horsepower claim with no context reads as a guess even when it is honest.

3. Chassis

Suspension, brakes, wheels, and tires. This is the section people most often under-specify. Coilover brand alone is not much use. Spring rates, ride height, camber, wheel size, offset, tire model, and tire size are what another owner or a buyer actually wants, and they cost you nothing to write down.

4. Exterior

Body work, aero, paint or wrap, lighting, and glass. Note what is genuine versus replica if that distinction exists for the part, and note it plainly. Everyone finds out eventually, and being the one who said it first is worth more than the part.

5. Interior

Seats, harnesses, steering wheel, gauges, audio, and any safety equipment such as a cage or fire suppression. If a seat or harness is dated, list the date, because it determines whether the car can run certain events.

6. Service history

The section that gets skipped and the one that carries the most weight with a buyer. Scheduled maintenance, repairs, fluids, timing components, and the mileage at each. A modified car with a documented service history sells as a cared-for car. The same car without one sells as a risk, no matter what the mod list says.

7. Photos and receipts

Not every part, but the meaningful ones: the work in progress, the parts before they went on, and the receipts for anything expensive. Receipts are what move a build sheet from a list of claims to a record, and they are the single strongest thing you can hand a skeptical buyer.

A worked example

Here is the shape it takes when it is filled in: group headings, part on the left, detail on the right, service history at the bottom. This is the long form, all seven sections, the version you hand to a buyer. A sheet made for a show is the same thing cut down to what someone can read while walking past.

An example sheet. Note that every performance claim carries its context, and the service history sits on the same page as the mods rather than in a separate folder.

Four mistakes that make a build sheet useless

1. Brand with no spec. "Ohlins coilovers" tells a reader almost nothing. "Ohlins DFV, 8k front, 6k rear" tells them what the car is set up to do.
2. No service history. A mod list on its own reads as money spent. A mod list with maintenance underneath it reads as a car that was looked after, which is what a buyer is actually trying to establish.
3. No dates. A part installed last month and a part installed six years and forty thousand miles ago are not the same part. Dates and mileage are what let someone judge wear.
4. It stopped being updated. This is the one that gets everybody. A build sheet made once in a word processor is accurate on the day you write it and wrong within a month. The half-finished document is worse than none, because now you also have to work out which parts of it are still true.

How to make one

Three approaches, and the honest tradeoffs of each.

A document or template

Word, Pages, Google Docs, or one of the paid printable templates sold for car shows. Fine for a one-off, and genuinely good if what you need is something attractive to sit on a stand next to the car. The catch is mistake number four: it is a snapshot, it will not update itself, and receipts live somewhere else entirely.

A spreadsheet

The enthusiast default, and better than it gets credit for. It sorts, it totals your spend, and it costs nothing. Where it struggles is everything that is not a number. Photos, receipts, and the story of why a part was chosen do not fit in a cell, so they end up in a folder, a camera roll, and a forum thread, which means the record is complete only as long as you personally remember where all four pieces live.

A build journal that generates it

Log each mod and each service once, as it happens, with its receipt and photos attached. The build sheet is then a view of that record rather than a separate document you maintain, so it is current by construction. This is what G-Dimension does: you record the work, and the Build Sheet, the timeline, and the exportable Build Report all come out of it. It is free, it runs in a browser, and it installs to your phone.

Questions