diff --git a/zcash_client_backend/src/constants.rs b/zcash_client_backend/src/constants.rs
index 8e5727c..627bbd9 100644
--- a/zcash_client_backend/src/constants.rs
+++ b/zcash_client_backend/src/constants.rs
@@ -1,4 +1,5 @@
 //! Zcash global and per-network constants.
 
 pub mod mainnet;
+pub mod regtest;
 pub mod testnet;
diff --git a/zcash_client_backend/src/constants/regtest.rs b/zcash_client_backend/src/constants/regtest.rs
new file mode 100644
index 0000000..8f6c415
--- /dev/null
+++ b/zcash_client_backend/src/constants/regtest.rs
@@ -0,0 +1,45 @@
+//! # Regtest constants
+//!
+//! `regtest` is a `zcashd`-specific environment used for local testing. They mostly reuse
+//! the testnet constants.
+//! These constants are defined in [the `zcashd` codebase].
+//! [the `zcashd` codebase]: https://github.com/zcash/zcash/blob/128d863fb8be39ee294fda397c1ce3ba3b889cb2/src/chainparams.cpp#L482-L496
+
+/// The regtest cointype reuses the testnet cointype
+pub const COIN_TYPE: u32 = 1;
+
+/// The HRP for a Bech32-encoded regtest [`ExtendedSpendingKey`].
+///
+/// It is defined in [the `zcashd` codebase].
+///
+/// [`ExtendedSpendingKey`]: zcash_primitives::zip32::ExtendedSpendingKey
+/// [the `zcashd` codebase]: https://github.com/zcash/zcash/blob/128d863fb8be39ee294fda397c1ce3ba3b889cb2/src/chainparams.cpp#L496
+pub const HRP_SAPLING_EXTENDED_SPENDING_KEY: &str = "secret-extended-key-regtest";
+
+/// The HRP for a Bech32-encoded regtest [`ExtendedFullViewingKey`].
+///
+/// It is defined in [the `zcashd` codebase].
+///
+/// [`ExtendedFullViewingKey`]: zcash_primitives::zip32::ExtendedFullViewingKey
+/// [the `zcashd` codebase]: https://github.com/zcash/zcash/blob/128d863fb8be39ee294fda397c1ce3ba3b889cb2/src/chainparams.cpp#L494
+pub const HRP_SAPLING_EXTENDED_FULL_VIEWING_KEY: &str = "zxviewregtestsapling";
+
+/// The HRP for a Bech32-encoded regtest [`PaymentAddress`].
+///
+/// It is defined in [the `zcashd` codebase].
+///
+/// [`PaymentAddress`]: zcash_primitives::primitives::PaymentAddress
+/// [the `zcashd` codebase]: https://github.com/zcash/zcash/blob/128d863fb8be39ee294fda397c1ce3ba3b889cb2/src/chainparams.cpp#L493
+pub const HRP_SAPLING_PAYMENT_ADDRESS: &str = "zregtestsapling";
+
+/// The prefix for a Base58Check-encoded regtest [`TransparentAddress::PublicKey`].
+/// Same as the testnet prefix.
+///
+/// [`TransparentAddress::PublicKey`]: zcash_primitives::legacy::TransparentAddress::PublicKey
+pub const B58_PUBKEY_ADDRESS_PREFIX: [u8; 2] = [0x1d, 0x25];
+
+/// The prefix for a Base58Check-encoded regtest [`TransparentAddress::Script`].
+/// Same as the testnet prefix.
+///
+/// [`TransparentAddress::Script`]: zcash_primitives::legacy::TransparentAddress::Script
+pub const B58_SCRIPT_ADDRESS_PREFIX: [u8; 2] = [0x1c, 0xba];