diff --git a/client/src/chains/avalancheLocal.ts b/client/src/chains/avalancheLocal.ts
new file mode 100644
index 00000000..d273c78f
--- /dev/null
+++ b/client/src/chains/avalancheLocal.ts
@@ -0,0 +1,15 @@
+import { defineChain } from "viem";
+
+export const avalancheLocal = /*#__PURE__*/ defineChain({
+  id: 43_112,
+  name: "Avalanche Local",
+  nativeCurrency: {
+    decimals: 18,
+    name: "Avalanche",
+    symbol: "AVAX",
+  },
+  rpcUrls: {
+    default: { http: ["http://127.0.0.1:9650/ext/bc/C/rpc"] },
+  },
+  testnet: true,
+});
diff --git a/client/src/chains/index.test.ts b/client/src/chains/index.test.ts
index 560a7d93..9706330f 100644
--- a/client/src/chains/index.test.ts
+++ b/client/src/chains/index.test.ts
@@ -171,6 +171,7 @@ test("exports", () => {
       "fantom",
       "avalanche",
       "avalancheFuji",
+      "avalancheLocal",
       "fantomSonicTestnet",
       "fantomTestnet",
       "fibo",
diff --git a/client/src/chains/index.ts b/client/src/chains/index.ts
index 95a6b8da..45cd1966 100644
--- a/client/src/chains/index.ts
+++ b/client/src/chains/index.ts
@@ -174,6 +174,7 @@ export type {
 } from "viem/chains";
 export { avalanche } from "./avalanche.js";
 export { avalancheFuji } from "./avalancheFuji.js";
+export { avalancheLocal } from "./avalancheLocal.js";
 /** @deprecated Use `sonicTestnet` instead. */
 export {
   fantomSonicTestnet,
diff --git a/client/src/clients/createAvalancheClient.ts b/client/src/clients/createAvalancheClient.ts
index c076141d..40f9a87b 100644
--- a/client/src/clients/createAvalancheClient.ts
+++ b/client/src/clients/createAvalancheClient.ts
@@ -8,6 +8,7 @@ import {
   RpcSchema,
   Transport,
 } from "viem";
+import { AVALANCHE_CHAIN_IDS } from "../methods/consts.js";
 import { AvalanchePublicRpcSchema } from "../methods/public/avalanchePublicRpcSchema.js";
 import { createAdminApiClient } from "./createAdminApiClient.js";
 import { createCChainClient } from "./createCChainClient.js";
@@ -23,6 +24,8 @@ import {
   AvalancheClientConfig,
 } from "./types/createAvalancheClient.js";
 import { createAvalancheTransportClient } from "./utils.js";
+
+const AVALANCHE_CHAIN_ID_VALUES = Object.values(AVALANCHE_CHAIN_IDS) as number[];
 /**
  * Creates an Avalanche Client with a given transport configured for a Chain.
  *
@@ -120,7 +123,7 @@ export function createAvalancheClient<
   });
   const extendedClient = client.extend(avalanchePublicActions) as any;
 
-  if (chainConfig?.id !== 43_113 && chainConfig?.id !== 43_114) {
+  if (!chainConfig?.id || !AVALANCHE_CHAIN_ID_VALUES.includes(chainConfig.id)) {
     return {
       ...extendedClient,
     };
diff --git a/client/src/clients/utils.ts b/client/src/clients/utils.ts
index 0465caa8..5853c6af 100644
--- a/client/src/clients/utils.ts
+++ b/client/src/clients/utils.ts
@@ -9,6 +9,9 @@ import {
 } from "viem";
 import { commonHeaders } from "./common.js";
 import { AvalancheTransportConfig, ClientType } from "./types/types.js";
+import { AVALANCHE_CHAIN_IDS } from "../methods/consts.js";
+
+const AVALANCHE_CHAIN_ID_VALUES = Object.values(AVALANCHE_CHAIN_IDS) as number[];
 
 export function createAvalancheTransportClient<
   transport extends Transport,
@@ -94,7 +97,7 @@ function getClientURL(
   clientType: ClientType = "public",
   transportType: "http" | "webSocket" = "http"
 ): string | undefined {
-  if (chain?.id !== 43_113 && chain?.id !== 43_114) {
+  if (!chain?.id || !AVALANCHE_CHAIN_ID_VALUES.includes(chain.id)) {
     return url ?? chain?.rpcUrls.default[transportType]?.[0];
   }
 
diff --git a/client/src/methods/consts.ts b/client/src/methods/consts.ts
index 9a00cfa6..db46ee3c 100644
--- a/client/src/methods/consts.ts
+++ b/client/src/methods/consts.ts
@@ -1,14 +1,32 @@
+// Chain IDs for easy reference
+export const AVALANCHE_CHAIN_IDS = {
+  MAINNET: 43114,
+  FUJI: 43113,
+  LOCAL: 43112,
+} as const;
+
+// Network IDs (different from chain IDs)
+export const AVALANCHE_NETWORK_IDS = {
+  MAINNET: 1,
+  FUJI: 5,
+  LOCAL: 1337,
+} as const;
+
 export const P_CHAIN_MAINNET_ID = '11111111111111111111111111111111LpoYY';
 export const P_CHAIN_FUJI_ID = '11111111111111111111111111111111LpoYY';
+export const P_CHAIN_LOCAL_ID = '11111111111111111111111111111111LpoYY';
 export const P_CHAIN_ALIAS = 'P';
 
 export const X_CHAIN_MAINNET_ID = '2oYMBNV4eNHyqk2fjjV5nVQLDbtmNJzq5s3qs3Lo6ftnC6FByM';
 export const X_CHAIN_FUJI_ID = '2JVSBoinj9C2J33VntvzYtVJNZdN2NKiwwKjcumHUWEb5DbBrm';
+export const X_CHAIN_LOCAL_ID = '2eNy1mUFdmaxXNj1eQHUe7Np4gju9sJsEtWQ4MX3ToiNKuADed';
 export const X_CHAIN_ALIAS = 'X';
 
 export const C_CHAIN_MAINNET_ID = '2q9e4r6Mu3U68nU1fYjgbR6JvwrRx36CohpAX5UQxse55x1Q5';
 export const C_CHAIN_FUJI_ID = 'yH8D7ThNJkxmtkuv2jgBa4P1Rn3Qpr4pPr7QYNfcdoS6k6HWp';
+export const C_CHAIN_LOCAL_ID = '2CA6j5zYzasynPsFeNoqWkmTCt3VScMvXUZHbfDJ8k3oGzAPtU';
 export const C_CHAIN_ALIAS = 'C';
 
 export const MAINNET_NETWORK_ID = 1;
-export const TESTNET_NETWORK_ID = 5;
\ No newline at end of file
+export const TESTNET_NETWORK_ID = 5;
+export const LOCAL_NETWORK_ID = 1337;
\ No newline at end of file
diff --git a/client/src/methods/index.test.ts b/client/src/methods/index.test.ts
index 2df70a92..2c705ba5 100644
--- a/client/src/methods/index.test.ts
+++ b/client/src/methods/index.test.ts
@@ -110,17 +110,23 @@ test("exports", () => {
       "watchEvent",
       "watchPendingTransactions",
       "writeContract",
+      "AVALANCHE_CHAIN_IDS",
+      "AVALANCHE_NETWORK_IDS",
       "P_CHAIN_MAINNET_ID",
       "P_CHAIN_FUJI_ID",
+      "P_CHAIN_LOCAL_ID",
       "P_CHAIN_ALIAS",
       "X_CHAIN_MAINNET_ID",
       "X_CHAIN_FUJI_ID",
+      "X_CHAIN_LOCAL_ID",
       "X_CHAIN_ALIAS",
       "C_CHAIN_MAINNET_ID",
       "C_CHAIN_FUJI_ID",
+      "C_CHAIN_LOCAL_ID",
       "C_CHAIN_ALIAS",
       "MAINNET_NETWORK_ID",
       "TESTNET_NETWORK_ID",
+      "LOCAL_NETWORK_ID",
     ]
   `);
 });