diff --git a/app/components/BuildCard.tsx b/app/components/BuildCard.tsx
index 40464adc7..20f1139af 100644
--- a/app/components/BuildCard.tsx
+++ b/app/components/BuildCard.tsx
@@ -35,6 +35,7 @@ import { Image } from "./Image";
 import { Popover } from "./Popover";
 import { InfoIcon } from "./icons/Info";
 import type { BuildWeaponWithTop500Info } from "~/db/models/builds/queries.server";
+import { LockIcon } from "./icons/Lock";
 
 interface BuildProps {
   build: Pick<
@@ -46,6 +47,7 @@ interface BuildProps {
     | "headGearSplId"
     | "shoesGearSplId"
     | "updatedAt"
+    | "private"
   > & {
     abilities: BuildAbilitiesTuple;
     modes: ModeShort[] | null;
@@ -82,7 +84,7 @@ export function BuildCard({ build, owner, canEdit = false }: BuildProps) {
   } = build;
 
   return (
-    <div className="build">
+    <div className={clsx("build", { build__private: build.private })}>
       <div>
         <div className="build__top-row">
           {modes && modes.length > 0 && (
@@ -114,18 +116,26 @@ export function BuildCard({ build, owner, canEdit = false }: BuildProps) {
               <div>•</div>
             </>
           ) : null}
-          <time className={clsx({ invisible: !isMounted })}>
-            {isMounted
-              ? databaseTimestampToDate(updatedAt).toLocaleDateString(
-                  i18n.language,
-                  {
-                    day: "numeric",
-                    month: "numeric",
-                    year: "numeric",
-                  }
-                )
-              : "t"}
-          </time>
+          <div className="stack horizontal sm">
+            {build.private ? (
+              <div className="build__private-text">
+                <LockIcon className="build__private-icon" />{" "}
+                {t("common:build.private")}
+              </div>
+            ) : null}
+            <time className={clsx({ invisible: !isMounted })}>
+              {isMounted
+                ? databaseTimestampToDate(updatedAt).toLocaleDateString(
+                    i18n.language,
+                    {
+                      day: "numeric",
+                      month: "numeric",
+                      year: "numeric",
+                    }
+                  )
+                : "t"}
+            </time>
+          </div>
         </div>
       </div>
       <div className="build__weapons">
diff --git a/app/components/icons/Lock.tsx b/app/components/icons/Lock.tsx
new file mode 100644
index 000000000..5f03d3fa6
--- /dev/null
+++ b/app/components/icons/Lock.tsx
@@ -0,0 +1,18 @@
+export function LockIcon({ className }: { className?: string }) {
+  return (
+    <svg
+      xmlns="http://www.w3.org/2000/svg"
+      fill="none"
+      viewBox="0 0 24 24"
+      strokeWidth={1.5}
+      stroke="currentColor"
+      className={className}
+    >
+      <path
+        strokeLinecap="round"
+        strokeLinejoin="round"
+        d="M16.5 10.5V6.75a4.5 4.5 0 10-9 0v3.75m-.75 11.25h10.5a2.25 2.25 0 002.25-2.25v-6.75a2.25 2.25 0 00-2.25-2.25H6.75a2.25 2.25 0 00-2.25 2.25v6.75a2.25 2.25 0 002.25 2.25z"
+      />
+    </svg>
+  );
+}
diff --git a/app/db/models/builds/buildsByUserId.sql b/app/db/models/builds/buildsByUserId.sql
index b3dc802c5..d0ca7a36c 100644
--- a/app/db/models/builds/buildsByUserId.sql
+++ b/app/db/models/builds/buildsByUserId.sql
@@ -22,6 +22,7 @@ with "Top500Weapon" as (
     "clothesGearSplId",
     "shoesGearSplId",
     "updatedAt",
+    "private",
     json_group_array(
       json_object(
         'weaponSplId',
@@ -37,6 +38,10 @@ with "Top500Weapon" as (
     left join "Top500Weapon" on "Top500Weapon"."buildId" = "Build"."id"
   where
     "Build"."ownerId" = @userId
+    and (
+      "Build"."private" = 0
+      or "Build"."ownerId" = @loggedInUserId
+    )
   group by
     "Build"."id"
 )
diff --git a/app/db/models/builds/buildsByWeaponId.sql b/app/db/models/builds/buildsByWeaponId.sql
index 81c3cf2bd..e8850207f 100644
--- a/app/db/models/builds/buildsByWeaponId.sql
+++ b/app/db/models/builds/buildsByWeaponId.sql
@@ -36,8 +36,11 @@ with "Top500Weapon" as (
     "Build"
     left join "Top500Weapon" on "Top500Weapon"."buildId" = "Build"."id"
   where
-    "Top500Weapon"."weaponSplId" = @weaponId
-    or "Top500Weapon"."weaponSplId" = @altWeaponId
+    (
+      "Top500Weapon"."weaponSplId" = @weaponId
+      or "Top500Weapon"."weaponSplId" = @altWeaponId
+    )
+    and "Build"."private" = 0
   group by
     "Build"."id"
 ),
diff --git a/app/db/models/builds/createBuild.sql b/app/db/models/builds/createBuild.sql
index 2d9ec99fd..b71db65f3 100644
--- a/app/db/models/builds/createBuild.sql
+++ b/app/db/models/builds/createBuild.sql
@@ -6,7 +6,8 @@ insert into
     "modes",
     "headGearSplId",
     "clothesGearSplId",
-    "shoesGearSplId"
+    "shoesGearSplId",
+    "private"
   )
 values
   (
@@ -16,5 +17,6 @@ values
     @modes,
     @headGearSplId,
     @clothesGearSplId,
-    @shoesGearSplId
-  ) returning *
\ No newline at end of file
+    @shoesGearSplId,
+    @private
+  ) returning *
diff --git a/app/db/models/builds/queries.server.ts b/app/db/models/builds/queries.server.ts
index 330fe958c..70dcec72c 100644
--- a/app/db/models/builds/queries.server.ts
+++ b/app/db/models/builds/queries.server.ts
@@ -40,6 +40,7 @@ interface CreateArgs {
   shoesGearSplId: Build["shoesGearSplId"];
   weaponSplIds: Array<BuildWeapon["weaponSplId"]>;
   abilities: BuildAbilitiesTuple;
+  private: Build["private"];
 }
 export const create = sql.transaction((build: CreateArgs) => {
   const createdBuild = createBuildStm.get({
@@ -57,6 +58,7 @@ export const create = sql.transaction((build: CreateArgs) => {
     headGearSplId: build.headGearSplId,
     clothesGearSplId: build.clothesGearSplId,
     shoesGearSplId: build.shoesGearSplId,
+    private: build.private,
   }) as Build;
 
   for (const weaponSplId of build.weaponSplIds) {
@@ -108,12 +110,22 @@ type BuildsByUserRow = Pick<
   | "clothesGearSplId"
   | "shoesGearSplId"
   | "updatedAt"
+  | "private"
 > & {
   weapons: string;
   abilities: string;
 };
-export function buildsByUserId(userId: Build["ownerId"]) {
-  const rows = buildsByUserIdStm.all({ userId }) as Array<BuildsByUserRow>;
+export function buildsByUserId({
+  userId,
+  loggedInUserId,
+}: {
+  userId: Build["ownerId"];
+  loggedInUserId?: UserWithPlusTier["id"];
+}) {
+  const rows = buildsByUserIdStm.all({
+    userId,
+    loggedInUserId,
+  }) as Array<BuildsByUserRow>;
 
   return rows.map(augmentBuild);
 }
diff --git a/app/db/seed/index.ts b/app/db/seed/index.ts
index 77bff4f7c..c8ac0531d 100644
--- a/app/db/seed/index.ts
+++ b/app/db/seed/index.ts
@@ -834,6 +834,7 @@ function adminBuilds() {
         faker.word.noun()
       )}`,
       ownerId: 1,
+      private: 0,
       description: Math.random() < 0.75 ? faker.lorem.paragraph() : null,
       headGearSplId: randomOrderHeadGear[0]!,
       clothesGearSplId: randomOrderClothesGear[0]!,
@@ -889,6 +890,7 @@ function manySplattershotBuilds() {
     );
 
     db.builds.create({
+      private: 0,
       title: `${capitalize(faker.word.adjective())} ${capitalize(
         faker.word.noun()
       )}`,
diff --git a/app/db/types.ts b/app/db/types.ts
index 2981a2ffa..90a491a94 100644
--- a/app/db/types.ts
+++ b/app/db/types.ts
@@ -151,6 +151,8 @@ export interface Build {
   id: number;
   ownerId: number;
   title: string;
+  /** Private builds are only visible on the user builds page to the owner only */
+  private: number;
   description: string | null;
   modes: string | null;
   headGearSplId: number;
diff --git a/app/features/build-stats/queries/abilitiesByWeaponId.server.ts b/app/features/build-stats/queries/abilitiesByWeaponId.server.ts
index 118e61d51..4bd207bf3 100644
--- a/app/features/build-stats/queries/abilitiesByWeaponId.server.ts
+++ b/app/features/build-stats/queries/abilitiesByWeaponId.server.ts
@@ -1,6 +1,7 @@
 import { sql } from "~/db/sql";
 import type { Ability, MainWeaponId } from "~/modules/in-game-lists";
 
+// TODO: could consider removing private builds from this
 const stm = sql.prepare(/* sql */ `
   with "GroupedAbilities" as (
     select 
diff --git a/app/features/build-stats/queries/averageAbilityPoints.server.ts b/app/features/build-stats/queries/averageAbilityPoints.server.ts
index e428a7462..a3acd7471 100644
--- a/app/features/build-stats/queries/averageAbilityPoints.server.ts
+++ b/app/features/build-stats/queries/averageAbilityPoints.server.ts
@@ -1,6 +1,7 @@
 import { sql } from "~/db/sql";
 import type { Ability, MainWeaponId } from "~/modules/in-game-lists";
 
+// TODO: could consider removing private builds from this
 const query = (includeWeaponId: boolean) => /* sql */ `
   select "BuildAbility"."ability", sum("BuildAbility"."abilityPoints") as "abilityPointsSum"
     from "BuildAbility"
diff --git a/app/routes/u.$identifier/builds/index.tsx b/app/routes/u.$identifier/builds/index.tsx
index fcedd73d5..b9f9c07a7 100644
--- a/app/routes/u.$identifier/builds/index.tsx
+++ b/app/routes/u.$identifier/builds/index.tsx
@@ -32,7 +32,7 @@ export const action: ActionFunction = async ({ request }) => {
 
   if (
     !db.builds
-      .buildsByUserId(user.id)
+      .buildsByUserId({ userId: user.id, loggedInUserId: user?.id })
       .some((build) => build.id === data.buildToDeleteId)
   ) {
     throw new Response(null, { status: 400 });
@@ -52,7 +52,10 @@ export const loader = async ({ params, request }: LoaderArgs) => {
   const { identifier } = userParamsSchema.parse(params);
   const user = notFoundIfFalsy(db.users.findByIdentifier(identifier));
 
-  const builds = db.builds.buildsByUserId(user.id);
+  const builds = db.builds.buildsByUserId({
+    userId: user.id,
+    loggedInUserId: loggedInUser?.id,
+  });
 
   if (builds.length === 0 && loggedInUser?.id !== user.id) {
     throw new Response(null, { status: 404 });
diff --git a/app/routes/u.$identifier/builds/new.tsx b/app/routes/u.$identifier/builds/new.tsx
index 1ea8940e5..b52bddee5 100644
--- a/app/routes/u.$identifier/builds/new.tsx
+++ b/app/routes/u.$identifier/builds/new.tsx
@@ -10,6 +10,7 @@ import { z } from "zod";
 import { AbilitiesSelector } from "~/components/AbilitiesSelector";
 import { Button } from "~/components/Button";
 import { GearCombobox, WeaponCombobox } from "~/components/Combobox";
+import { FormMessage } from "~/components/FormMessage";
 import { CrossIcon } from "~/components/icons/Cross";
 import { PlusIcon } from "~/components/icons/Plus";
 import { Image } from "~/components/Image";
@@ -43,7 +44,9 @@ import { modeImageUrl, userBuildsPage } from "~/utils/urls";
 import {
   actualNumber,
   checkboxValueToBoolean,
+  checkboxValueToDbBoolean,
   clothesMainSlotAbility,
+  dbBoolean,
   falsyToNull,
   headMainSlotAbility,
   id,
@@ -68,6 +71,7 @@ const newBuildActionSchema = z.object({
   TC: z.preprocess(checkboxValueToBoolean, z.boolean()),
   RM: z.preprocess(checkboxValueToBoolean, z.boolean()),
   CB: z.preprocess(checkboxValueToBoolean, z.boolean()),
+  private: z.preprocess(checkboxValueToDbBoolean, dbBoolean),
   "weapon[value]": z.preprocess(
     processMany(toArray, removeDuplicates),
     z.array(weaponSplId).min(1).max(BUILD.MAX_WEAPONS_COUNT)
@@ -128,7 +132,10 @@ export const action: ActionFunction = async ({ request }) => {
     schema: newBuildActionSchema,
   });
 
-  const usersBuilds = db.builds.buildsByUserId(user.id);
+  const usersBuilds = db.builds.buildsByUserId({
+    userId: user.id,
+    loggedInUserId: user.id,
+  });
   if (usersBuilds.length >= BUILD.MAX_COUNT) {
     throw new Response(null, { status: 400 });
   }
@@ -143,6 +150,7 @@ export const action: ActionFunction = async ({ request }) => {
     modes: modesShort.filter((mode) => data[mode]),
     weaponSplIds: data["weapon[value]"] as Array<MainWeaponId>,
     ownerId: user.id,
+    private: data.private,
   };
   if (data.buildToEditId) {
     db.builds.updateByReplacing({ id: data.buildToEditId, ...commonArgs });
@@ -174,7 +182,10 @@ export const loader = async ({ request }: LoaderArgs) => {
     return json({ buildToEdit: null });
   }
 
-  const usersBuilds = db.builds.buildsByUserId(params.data.userId);
+  const usersBuilds = db.builds.buildsByUserId({
+    userId: params.data.userId,
+    loggedInUserId: user.id,
+  });
   const buildToEdit = usersBuilds.find((b) => b.id === params.data.buildId);
 
   return json({
@@ -200,6 +211,7 @@ export default function NewBuildPage() {
         <TitleInput />
         <DescriptionTextarea />
         <ModeCheckboxes />
+        <PrivateCheckbox />
         <SubmitButton className="mt-4">{t("actions.submit")}</SubmitButton>
       </Form>
     </div>
@@ -282,6 +294,26 @@ function ModeCheckboxes() {
   );
 }
 
+function PrivateCheckbox() {
+  const { buildToEdit } = useLoaderData<typeof loader>();
+  const { t } = useTranslation(["builds", "common"]);
+
+  return (
+    <div>
+      <Label htmlFor="private">{t("common:build.private")}</Label>
+      <input
+        id="private"
+        name="private"
+        type="checkbox"
+        defaultChecked={Boolean(buildToEdit?.private)}
+      />
+      <FormMessage type="info" className="mt-0">
+        {t("builds:forms.private.info")}
+      </FormMessage>
+    </div>
+  );
+}
+
 function WeaponsSelector() {
   const [searchParams] = useSearchParams();
   const { buildToEdit } = useLoaderData<typeof loader>();
diff --git a/app/styles/common.css b/app/styles/common.css
index 4bf2882a5..971dd8233 100644
--- a/app/styles/common.css
+++ b/app/styles/common.css
@@ -840,6 +840,23 @@ dialog::backdrop {
   gap: var(--s-3);
 }
 
+.build__private {
+  background-color: var(--bg-lighter-transparent);
+}
+
+.build__private-text {
+  display: flex;
+  justify-content: center;
+  font-weight: var(--semi-bold);
+  gap: var(--s-1);
+}
+
+.build__private-icon {
+  width: 16px;
+  margin-block-end: var(--s-1);
+  stroke-width: 2px;
+}
+
 .build__title {
   overflow: hidden;
   height: 2.5rem;
diff --git a/app/styles/utils.css b/app/styles/utils.css
index 1ec0b7048..dde3a0bb8 100644
--- a/app/styles/utils.css
+++ b/app/styles/utils.css
@@ -122,6 +122,10 @@
   padding-block-start: var(--s-12) !important;
 }
 
+.mt-0 {
+  margin-block-start: var(--s-0);
+}
+
 .mt-2 {
   margin-block-start: var(--s-2);
 }
diff --git a/app/utils/zod.ts b/app/utils/zod.ts
index 919d4a8bc..a3cb18581 100644
--- a/app/utils/zod.ts
+++ b/app/utils/zod.ts
@@ -7,6 +7,7 @@ import {
 } from "~/modules/in-game-lists";
 
 export const id = z.coerce.number().int().positive();
+export const dbBoolean = z.coerce.number().min(0).max(1).int();
 
 const abilityNameToType = (val: string) =>
   abilities.find((ability) => ability.name === val)?.type;
@@ -145,3 +146,9 @@ export function checkboxValueToBoolean(value: unknown) {
 
   return value === "on";
 }
+
+export function checkboxValueToDbBoolean(value: unknown) {
+  if (checkboxValueToBoolean(value)) return 1;
+
+  return 0;
+}
diff --git a/migrations/025-private-builds.js b/migrations/025-private-builds.js
new file mode 100644
index 000000000..55b8376a1
--- /dev/null
+++ b/migrations/025-private-builds.js
@@ -0,0 +1,5 @@
+module.exports.up = function (db) {
+  db.prepare(
+    /* sql */ `alter table "Build" add "private" integer default 0`
+  ).run();
+};
diff --git a/public/locales/en/builds.json b/public/locales/en/builds.json
index 9cf64273a..c0a0692ec 100644
--- a/public/locales/en/builds.json
+++ b/public/locales/en/builds.json
@@ -11,6 +11,7 @@
   "forms.gear.HEAD": "Gear (head)",
   "forms.gear.CLOTHES": "Gear (clothes)",
   "forms.gear.SHOES": "Gear (shoes)",
+  "forms.private.info": "Private builds are only visible to you",
 
   "deleteConfirm": "Delete build '{{title}}'?",
 
diff --git a/public/locales/en/common.json b/public/locales/en/common.json
index 7d7d2a59e..13abbb032 100644
--- a/public/locales/en/common.json
+++ b/public/locales/en/common.json
@@ -176,5 +176,7 @@
   "divisions.WEST": "Tentatek",
   "divisions.JPN": "Takoroka",
   "xsearch.placements": "placements",
-  "xsearch.aliases": "Aliases:"
+  "xsearch.aliases": "Aliases:",
+
+  "build.private": "Private"
 }