diff --git a/site/src/api/errors.ts b/site/src/api/errors.ts
index c9a328803b..9705a08ff0 100644
--- a/site/src/api/errors.ts
+++ b/site/src/api/errors.ts
@@ -19,7 +19,7 @@ export interface ApiErrorResponse {
 	validations?: FieldError[];
 }
 
-type ApiError = AxiosError<ApiErrorResponse> & {
+export type ApiError = AxiosError<ApiErrorResponse> & {
 	response: AxiosResponse<ApiErrorResponse>;
 };
 
diff --git a/site/src/components/Dialog/Dialog.tsx b/site/src/components/Dialog/Dialog.tsx
index 2ec8ab4078..2ec5fa4dae 100644
--- a/site/src/components/Dialog/Dialog.tsx
+++ b/site/src/components/Dialog/Dialog.tsx
@@ -3,6 +3,7 @@
  * @see {@link https://ui.shadcn.com/docs/components/dialog}
  */
 import * as DialogPrimitive from "@radix-ui/react-dialog";
+import { type VariantProps, cva } from "class-variance-authority";
 import {
 	type ComponentPropsWithoutRef,
 	type ElementRef,
@@ -36,25 +37,41 @@ const DialogOverlay = forwardRef<
 	/>
 ));
 
+const dialogVariants = cva(
+	`fixed left-[50%] top-[50%] z-50 grid w-full max-w-lg gap-6
+	border border-solid bg-surface-primary p-8 shadow-lg duration-200 sm:rounded-lg
+	translate-x-[-50%] translate-y-[-50%]
+	data-[state=open]:animate-in data-[state=closed]:animate-out
+	data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0
+	data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-95
+	data-[state=closed]:slide-out-to-left-1/2 data-[state=closed]:slide-out-to-top-[48%]
+	data-[state=open]:slide-in-from-left-1/2 data-[state=open]:slide-in-from-top-[48%]`,
+	{
+		variants: {
+			variant: {
+				default: "border-border-primary",
+				destructive: "border-border-destructive",
+			},
+		},
+		defaultVariants: {
+			variant: "default",
+		},
+	},
+);
+
+interface DialogContentProps
+	extends ComponentPropsWithoutRef<typeof DialogPrimitive.Content>,
+		VariantProps<typeof dialogVariants> {}
+
 export const DialogContent = forwardRef<
 	ElementRef<typeof DialogPrimitive.Content>,
-	ComponentPropsWithoutRef<typeof DialogPrimitive.Content>
->(({ className, children, ...props }, ref) => (
+	DialogContentProps
+>(({ className, variant, children, ...props }, ref) => (
 	<DialogPortal>
 		<DialogOverlay />
 		<DialogPrimitive.Content
 			ref={ref}
-			className={cn(
-				`fixed left-[50%] top-[50%] z-50 grid w-full max-w-lg gap-6
-				 border border-solid border-border bg-surface-primary p-8 shadow-lg duration-200 sm:rounded-lg
-				 translate-x-[-50%] translate-y-[-50%]
-				 data-[state=open]:animate-in data-[state=closed]:animate-out
-				 data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0
-				 data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-95
-				 data-[state=closed]:slide-out-to-left-1/2 data-[state=closed]:slide-out-to-top-[48%]
-				 data-[state=open]:slide-in-from-left-1/2 data-[state=open]:slide-in-from-top-[48%]`,
-				className,
-			)}
+			className={cn(dialogVariants({ variant }), className)}
 			{...props}
 		>
 			{children}
diff --git a/site/src/components/EphemeralParametersDialog/EphemeralParametersDialog.tsx b/site/src/modules/workspaces/EphemeralParametersDialog/EphemeralParametersDialog.tsx
similarity index 100%
rename from site/src/components/EphemeralParametersDialog/EphemeralParametersDialog.tsx
rename to site/src/modules/workspaces/EphemeralParametersDialog/EphemeralParametersDialog.tsx
diff --git a/site/src/modules/workspaces/ErrorDialog/WorkspaceErrorDialog.tsx b/site/src/modules/workspaces/ErrorDialog/WorkspaceErrorDialog.tsx
new file mode 100644
index 0000000000..cc2512692c
--- /dev/null
+++ b/site/src/modules/workspaces/ErrorDialog/WorkspaceErrorDialog.tsx
@@ -0,0 +1,83 @@
+import { getErrorDetail, getErrorMessage, isApiError } from "api/errors";
+import { Button } from "components/Button/Button";
+import {
+	Dialog,
+	DialogContent,
+	DialogDescription,
+	DialogFooter,
+	DialogHeader,
+	DialogTitle,
+} from "components/Dialog/Dialog";
+import type { FC } from "react";
+import { useNavigate } from "react-router-dom";
+
+interface WorkspaceErrorDialogProps {
+	open: boolean;
+	error?: unknown;
+	onClose: () => void;
+	showDetail: boolean;
+	workspaceOwner: string;
+	workspaceName: string;
+	templateVersionId: string;
+}
+
+export const WorkspaceErrorDialog: FC<WorkspaceErrorDialogProps> = ({
+	open,
+	error,
+	onClose,
+	showDetail,
+	workspaceOwner,
+	workspaceName,
+	templateVersionId,
+}) => {
+	const navigate = useNavigate();
+
+	if (!error) {
+		return null;
+	}
+
+	const handleGoToParameters = () => {
+		onClose();
+		navigate(
+			`/@${workspaceOwner}/${workspaceName}/settings/parameters?templateVersionId=${templateVersionId}`,
+		);
+	};
+
+	const errorDetail = getErrorDetail(error);
+	const validations = isApiError(error)
+		? error.response.data.validations
+		: undefined;
+
+	return (
+		<Dialog open={open} onOpenChange={(isOpen) => !isOpen && onClose()}>
+			<DialogContent variant="destructive">
+				<DialogHeader>
+					<DialogTitle>Error building workspace</DialogTitle>
+					<DialogDescription className="flex flex-row gap-4">
+						<strong className="text-content-primary">Message</strong>{" "}
+						<span>{getErrorMessage(error, "Failed to build workspace.")}</span>
+					</DialogDescription>
+					{errorDetail && showDetail && (
+						<DialogDescription className="flex flex-row gap-9">
+							<strong className="text-content-primary">Detail</strong>{" "}
+							<span>{errorDetail}</span>
+						</DialogDescription>
+					)}
+					{validations && (
+						<DialogDescription className="flex flex-row gap-4">
+							<strong className="text-content-primary">Validations</strong>{" "}
+							<span>
+								{validations.map((validation) => validation.detail).join(", ")}
+							</span>
+						</DialogDescription>
+					)}
+				</DialogHeader>
+				<DialogFooter>
+					<Button onClick={handleGoToParameters}>
+						Review workspace settings
+					</Button>
+				</DialogFooter>
+			</DialogContent>
+		</Dialog>
+	);
+};
diff --git a/site/src/pages/WorkspacePage/WorkspaceReadyPage.tsx b/site/src/pages/WorkspacePage/WorkspaceReadyPage.tsx
index f1d48f0fcc..1e727faf46 100644
--- a/site/src/pages/WorkspacePage/WorkspaceReadyPage.tsx
+++ b/site/src/pages/WorkspacePage/WorkspaceReadyPage.tsx
@@ -1,5 +1,6 @@
 import { API } from "api/api";
-import { getErrorMessage } from "api/errors";
+import { type ApiError, getErrorMessage } from "api/errors";
+import { isApiError } from "api/errors";
 import { templateVersion } from "api/queries/templates";
 import { workspaceBuildTimings } from "api/queries/workspaceBuilds";
 import {
@@ -15,9 +16,10 @@ import {
 	ConfirmDialog,
 	type ConfirmDialogProps,
 } from "components/Dialogs/ConfirmDialog/ConfirmDialog";
-import { EphemeralParametersDialog } from "components/EphemeralParametersDialog/EphemeralParametersDialog";
 import { displayError } from "components/GlobalSnackbar/utils";
 import { useWorkspaceBuildLogs } from "hooks/useWorkspaceBuildLogs";
+import { EphemeralParametersDialog } from "modules/workspaces/EphemeralParametersDialog/EphemeralParametersDialog";
+import { WorkspaceErrorDialog } from "modules/workspaces/ErrorDialog/WorkspaceErrorDialog";
 import {
 	WorkspaceUpdateDialogs,
 	useWorkspaceUpdate,
@@ -55,15 +57,35 @@ export const WorkspaceReadyPage: FC<WorkspaceReadyPageProps> = ({
 		buildParameters?: TypesGen.WorkspaceBuildParameter[];
 	}>({ open: false });
 
+	const [workspaceErrorDialog, setWorkspaceErrorDialog] = useState<{
+		open: boolean;
+		error?: ApiError;
+	}>({ open: false });
+
+	const handleError = (error: unknown) => {
+		if (isApiError(error) && error.code === "ERR_BAD_REQUEST") {
+			setWorkspaceErrorDialog({
+				open: true,
+				error: error,
+			});
+		} else {
+			displayError(getErrorMessage(error, "Failed to build workspace."));
+		}
+	};
+
 	const [ephemeralParametersDialog, setEphemeralParametersDialog] = useState<{
 		open: boolean;
 		action: "start" | "restart";
 		buildParameters?: TypesGen.WorkspaceBuildParameter[];
 		ephemeralParameters: TypesGen.TemplateVersionParameter[];
 	}>({ open: false, action: "start", ephemeralParameters: [] });
+
 	const { mutate: mutateRestartWorkspace, isPending: isRestarting } =
 		useMutation({
 			mutationFn: API.restartWorkspace,
+			onError: (error: unknown) => {
+				handleError(error);
+			},
 		});
 
 	// Favicon
@@ -92,32 +114,52 @@ export const WorkspaceReadyPage: FC<WorkspaceReadyPageProps> = ({
 	});
 
 	// Delete workspace
-	const deleteWorkspaceMutation = useMutation(
-		deleteWorkspace(workspace, queryClient),
-	);
+	const deleteWorkspaceMutation = useMutation({
+		...deleteWorkspace(workspace, queryClient),
+		onError: (error: unknown) => {
+			handleError(error);
+		},
+	});
 
 	// Activate workspace
-	const activateWorkspaceMutation = useMutation(
-		activate(workspace, queryClient),
-	);
+	const activateWorkspaceMutation = useMutation({
+		...activate(workspace, queryClient),
+		onError: (error: unknown) => {
+			handleError(error);
+		},
+	});
 
 	// Stop workspace
-	const stopWorkspaceMutation = useMutation(
-		stopWorkspace(workspace, queryClient),
-	);
+	const stopWorkspaceMutation = useMutation({
+		...stopWorkspace(workspace, queryClient),
+		onError: (error: unknown) => {
+			handleError(error);
+		},
+	});
 
 	// Start workspace
-	const startWorkspaceMutation = useMutation(
-		startWorkspace(workspace, queryClient),
-	);
+	const startWorkspaceMutation = useMutation({
+		...startWorkspace(workspace, queryClient),
+		onError: (error: unknown) => {
+			handleError(error);
+		},
+	});
 
 	// Toggle workspace favorite
-	const toggleFavoriteMutation = useMutation(
-		toggleFavorite(workspace, queryClient),
-	);
+	const toggleFavoriteMutation = useMutation({
+		...toggleFavorite(workspace, queryClient),
+		onError: (error: unknown) => {
+			handleError(error);
+		},
+	});
 
 	// Cancel build
-	const cancelBuildMutation = useMutation(cancelBuild(workspace, queryClient));
+	const cancelBuildMutation = useMutation({
+		...cancelBuild(workspace, queryClient),
+		onError: (error: unknown) => {
+			handleError(error);
+		},
+	});
 
 	// Workspace Timings.
 	const timingsQuery = useQuery({
@@ -341,6 +383,16 @@ export const WorkspaceReadyPage: FC<WorkspaceReadyPageProps> = ({
 			/>
 
 			<WorkspaceUpdateDialogs {...workspaceUpdate.dialogs} />
+
+			<WorkspaceErrorDialog
+				open={workspaceErrorDialog.open}
+				error={workspaceErrorDialog.error}
+				onClose={() => setWorkspaceErrorDialog({ open: false })}
+				showDetail={workspace.template_use_classic_parameter_flow}
+				workspaceOwner={workspace.owner_name}
+				workspaceName={workspace.name}
+				templateVersionId={workspace.latest_build.template_version_id}
+			/>
 		</>
 	);
 };