diff --git a/Refit.Tests/InterfaceStubGenerator.cs b/Refit.Tests/InterfaceStubGenerator.cs
index 3ca27f283..2e0858485 100644
--- a/Refit.Tests/InterfaceStubGenerator.cs
+++ b/Refit.Tests/InterfaceStubGenerator.cs
@@ -126,7 +126,7 @@ public void GenerateTemplateInfoForInterfaceListSmokeTest()
                 .ToList();
 
             var result = fixture.GenerateTemplateInfoForInterfaceList(input);
-            Assert.Equal(12, result.ClassList.Count);
+            Assert.Equal(14, result.ClassList.Count);
         }
 
         [Fact]
diff --git a/Refit.Tests/RefitStubs.Net46.cs b/Refit.Tests/RefitStubs.Net46.cs
index 64751d66b..06826898a 100644
--- a/Refit.Tests/RefitStubs.Net46.cs
+++ b/Refit.Tests/RefitStubs.Net46.cs
@@ -1331,6 +1331,70 @@ Task<RootObject> INpmJs.GetCongruence()
     }
 }
 
+namespace Refit.Tests
+{
+    using Refit.Tests.RefitInternalGenerated;
+
+    /// <inheritdoc />
+    [global::System.Diagnostics.CodeAnalysis.ExcludeFromCodeCoverage]
+    [global::System.Diagnostics.DebuggerNonUserCode]
+    [Preserve]
+    [global::System.Reflection.Obfuscation(Exclude=true)]
+    partial class AutoGeneratedIRelativePathApi1 : IRelativePathApi1
+    {
+        /// <inheritdoc />
+        public HttpClient Client { get; protected set; }
+        readonly IRequestBuilder requestBuilder;
+
+        /// <inheritdoc />
+        public AutoGeneratedIRelativePathApi1(HttpClient client, IRequestBuilder requestBuilder)
+        {
+            Client = client;
+            this.requestBuilder = requestBuilder;
+        }
+
+        /// <inheritdoc />
+        Task IRelativePathApi1.Get()
+        {
+            var arguments = new object[] {  };
+            var func = requestBuilder.BuildRestResultFuncForMethod("Get", new Type[] {  });
+            return (Task)func(Client, arguments);
+        }
+    }
+}
+
+namespace Refit.Tests
+{
+    using Refit.Tests.RefitInternalGenerated;
+
+    /// <inheritdoc />
+    [global::System.Diagnostics.CodeAnalysis.ExcludeFromCodeCoverage]
+    [global::System.Diagnostics.DebuggerNonUserCode]
+    [Preserve]
+    [global::System.Reflection.Obfuscation(Exclude=true)]
+    partial class AutoGeneratedIRelativePathApi2 : IRelativePathApi2
+    {
+        /// <inheritdoc />
+        public HttpClient Client { get; protected set; }
+        readonly IRequestBuilder requestBuilder;
+
+        /// <inheritdoc />
+        public AutoGeneratedIRelativePathApi2(HttpClient client, IRequestBuilder requestBuilder)
+        {
+            Client = client;
+            this.requestBuilder = requestBuilder;
+        }
+
+        /// <inheritdoc />
+        Task IRelativePathApi2.Get()
+        {
+            var arguments = new object[] {  };
+            var func = requestBuilder.BuildRestResultFuncForMethod("Get", new Type[] {  });
+            return (Task)func(Client, arguments);
+        }
+    }
+}
+
 namespace Refit.Tests
 {
     using Refit.Tests.RefitInternalGenerated;
diff --git a/Refit.Tests/RefitStubs.NetCore2.cs b/Refit.Tests/RefitStubs.NetCore2.cs
index 64751d66b..06826898a 100644
--- a/Refit.Tests/RefitStubs.NetCore2.cs
+++ b/Refit.Tests/RefitStubs.NetCore2.cs
@@ -1331,6 +1331,70 @@ Task<RootObject> INpmJs.GetCongruence()
     }
 }
 
+namespace Refit.Tests
+{
+    using Refit.Tests.RefitInternalGenerated;
+
+    /// <inheritdoc />
+    [global::System.Diagnostics.CodeAnalysis.ExcludeFromCodeCoverage]
+    [global::System.Diagnostics.DebuggerNonUserCode]
+    [Preserve]
+    [global::System.Reflection.Obfuscation(Exclude=true)]
+    partial class AutoGeneratedIRelativePathApi1 : IRelativePathApi1
+    {
+        /// <inheritdoc />
+        public HttpClient Client { get; protected set; }
+        readonly IRequestBuilder requestBuilder;
+
+        /// <inheritdoc />
+        public AutoGeneratedIRelativePathApi1(HttpClient client, IRequestBuilder requestBuilder)
+        {
+            Client = client;
+            this.requestBuilder = requestBuilder;
+        }
+
+        /// <inheritdoc />
+        Task IRelativePathApi1.Get()
+        {
+            var arguments = new object[] {  };
+            var func = requestBuilder.BuildRestResultFuncForMethod("Get", new Type[] {  });
+            return (Task)func(Client, arguments);
+        }
+    }
+}
+
+namespace Refit.Tests
+{
+    using Refit.Tests.RefitInternalGenerated;
+
+    /// <inheritdoc />
+    [global::System.Diagnostics.CodeAnalysis.ExcludeFromCodeCoverage]
+    [global::System.Diagnostics.DebuggerNonUserCode]
+    [Preserve]
+    [global::System.Reflection.Obfuscation(Exclude=true)]
+    partial class AutoGeneratedIRelativePathApi2 : IRelativePathApi2
+    {
+        /// <inheritdoc />
+        public HttpClient Client { get; protected set; }
+        readonly IRequestBuilder requestBuilder;
+
+        /// <inheritdoc />
+        public AutoGeneratedIRelativePathApi2(HttpClient client, IRequestBuilder requestBuilder)
+        {
+            Client = client;
+            this.requestBuilder = requestBuilder;
+        }
+
+        /// <inheritdoc />
+        Task IRelativePathApi2.Get()
+        {
+            var arguments = new object[] {  };
+            var func = requestBuilder.BuildRestResultFuncForMethod("Get", new Type[] {  });
+            return (Task)func(Client, arguments);
+        }
+    }
+}
+
 namespace Refit.Tests
 {
     using Refit.Tests.RefitInternalGenerated;
diff --git a/Refit.Tests/RestService.cs b/Refit.Tests/RestService.cs
index 4eeb42189..6efb7e8c1 100644
--- a/Refit.Tests/RestService.cs
+++ b/Refit.Tests/RestService.cs
@@ -139,6 +139,24 @@ public interface ITrimTrailingForwardSlashApi
         Task Get();
     }
 
+    [BaseAddress("/api/Test")]
+    public interface IRelativePathApi1
+    {
+        HttpClient Client { get; }
+
+        [Get("/someendpoint")]
+        Task Get();
+    }
+
+    [BaseAddress()]
+    public interface IRelativePathApi2
+    {
+        HttpClient Client { get; }
+
+        [Get("/someendpoint")]
+        Task Get();
+    }
+
     public interface IValidApi
     {
         [Get("/someendpoint")]
@@ -1301,5 +1319,20 @@ public void NonGenericCreate()
 
             Assert.Equal(fixture.Client.BaseAddress.AbsoluteUri, expectedBaseAddress);
         }
+
+        [Fact]
+        public void RelativePathCreate()
+        {
+            var inputBaseAddress = "http://example.com/";
+
+            var expectedBaseAddress1 = "http://example.com/api/Test";
+            var expectedBaseAddress2 = "http://example.com/";
+
+            var fixture1 = RestService.For<IRelativePathApi1>(inputBaseAddress);
+            var fixture2 = RestService.For<IRelativePathApi2>(inputBaseAddress);
+
+            Assert.Equal(fixture1.Client.BaseAddress.AbsoluteUri, expectedBaseAddress1);
+            Assert.Equal(fixture2.Client.BaseAddress.AbsoluteUri, expectedBaseAddress2);
+        }
     }
 }
diff --git a/Refit/Attributes.cs b/Refit/Attributes.cs
index f7097ece6..afcaa7300 100644
--- a/Refit/Attributes.cs
+++ b/Refit/Attributes.cs
@@ -318,4 +318,15 @@ public QueryAttribute(CollectionFormat collectionFormat)
         /// </summary>
         public CollectionFormat CollectionFormat { get; set; } = CollectionFormat.RefitParameterFormatter;
     }
+
+    [AttributeUsage(AttributeTargets.Interface)]
+    public class BaseAddressAttribute : Attribute
+    {
+        public BaseAddressAttribute(string relativePath = null)
+        {
+            RelativePath = relativePath;
+        }
+
+        public string RelativePath { get; }
+    }
 }
diff --git a/Refit/RestService.cs b/Refit/RestService.cs
index 6d2e282a7..41ef3f2b4 100644
--- a/Refit/RestService.cs
+++ b/Refit/RestService.cs
@@ -3,6 +3,7 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.Net.Http;
+using System.Reflection;
 using System.Threading.Tasks;
 
 namespace Refit
@@ -18,9 +19,7 @@ public static class RestService
 
         public static T For<T>(HttpClient client, IRequestBuilder<T> builder)
         {
-            var generatedType = TypeMapping.GetOrAdd(typeof(T), GetGeneratedType<T>());
-
-            return (T)Activator.CreateInstance(generatedType, client, builder);
+            return (T)For(typeof(T), client, builder);
         }
 
         public static T For<T>(HttpClient client, RefitSettings settings)
@@ -43,7 +42,14 @@ public static T For<T>(string hostUrl, RefitSettings settings)
 
         public static object For(Type refitInterfaceType, HttpClient client, IRequestBuilder builder)
         {
-            var generatedType = TypeMapping.GetOrAdd(refitInterfaceType, GetGeneratedType(refitInterfaceType));
+            var generatedType = TypeMapping.GetOrAdd(refitInterfaceType, type => GetGeneratedType(type));
+
+            var aps = refitInterfaceType.GetTypeInfo().GetCustomAttributes(true).OfType<BaseAddressAttribute>().FirstOrDefault();
+
+            if (aps != null && !string.IsNullOrEmpty(aps.RelativePath))
+            {
+                client.BaseAddress = new Uri(client.BaseAddress, aps.RelativePath);
+            }
 
             return Activator.CreateInstance(generatedType, client, builder);
         }
@@ -94,14 +100,9 @@ public static HttpClient CreateHttpClient(string hostUrl, RefitSettings settings
             return new HttpClient(innerHandler ?? new HttpClientHandler()) { BaseAddress = new Uri(hostUrl.TrimEnd('/')) };
         }
 
-        static Type GetGeneratedType<T>()
-        {
-            return GetGeneratedType(typeof(T));
-        }
-
         static Type GetGeneratedType(Type refitInterfaceType)
         {
-            string typeName = UniqueName.ForType(refitInterfaceType);
+            var typeName = UniqueName.ForType(refitInterfaceType);
 
             var generatedType = Type.GetType(typeName);