diff --git a/planetiler-custommap/README.md b/planetiler-custommap/README.md
index 719d39ae..c01bc65a 100644
--- a/planetiler-custommap/README.md
+++ b/planetiler-custommap/README.md
@@ -222,6 +222,8 @@ A feature is a defined set of objects that meet a specified filter criteria.
 - `exclude_when` - A [Boolean Expression](#boolean-expression) which determines if a feature that matched the include
   expression should be skipped. If unspecified, no exclusion filter is applied.
 - `min_zoom` - An [Expression](#expression) that returns the minimum zoom to render this feature at.
+- `min_size` - An [Expression](#expression) that returns the minimum length of line features or square root of the
+  minimum area of polygon features to emit below the maximum zoom-level of the map.
 - `attributes` - An array of [Feature Attribute](#feature-attribute) objects that specify the attributes to be included
   on this output feature.
 
@@ -672,6 +674,8 @@ docker run -v "$(pwd)/data":/data ghcr.io/onthegomap/planetiler:latest verify /d
   - `geometry` - Geometry type of the expected output feature.
   - `min_zoom` - Min zoom level that the output feature appears in.
   - `max_zoom` - Max zoom level that the output feature appears in.
+  - `min_size` - Minimum length of line features or square root of the minimum area of polygon features to emit below
+    the maximum zoom-level of the map.
   - `tags` - Attributes expected on the output vector tile feature, or `null` if the attribute should not be set. Use
     `allow_extra_tags: true` to fail if any other tags appear besides the ones specified here.
   - `allow_extra_tags` - If `true`, then fail when extra attributes besides tags appear on the output feature.
diff --git a/planetiler-custommap/planetiler.schema.json b/planetiler-custommap/planetiler.schema.json
index e8b6f2a6..0f636de6 100644
--- a/planetiler-custommap/planetiler.schema.json
+++ b/planetiler-custommap/planetiler.schema.json
@@ -392,6 +392,10 @@
           "items": {
             "$ref": "#/$defs/attribute"
           }
+        },
+        "min_size": {
+          "description": "Minimum length of line features or square root of the minimum area of polygon features to emit below the maximum zoom-level of the map",
+          "$ref": "#/$defs/expression"
         }
       }
     },
diff --git a/planetiler-custommap/planetilerspec.schema.json b/planetiler-custommap/planetilerspec.schema.json
index c642ca18..1cc463c7 100644
--- a/planetiler-custommap/planetilerspec.schema.json
+++ b/planetiler-custommap/planetilerspec.schema.json
@@ -83,6 +83,10 @@
           "description": "Max zoom level that the output feature appears in",
           "type": "integer"
         },
+        "min_size": {
+          "description": "Minimum length of line features or square root of the minimum area of polygon features to emit below the maximum zoom-level of the map",
+          "type": "number"
+        },
         "tags": {
           "description": "Attributes expected on the output vector tile feature, or null if the attribute should not be set. Use allow_extra_tags: true to fail if any other tags appear besides the ones specified here",
           "oneOf": [
diff --git a/planetiler-custommap/src/main/java/com/onthegomap/planetiler/custommap/ConfiguredFeature.java b/planetiler-custommap/src/main/java/com/onthegomap/planetiler/custommap/ConfiguredFeature.java
index 02023ee3..a43e7f64 100644
--- a/planetiler-custommap/src/main/java/com/onthegomap/planetiler/custommap/ConfiguredFeature.java
+++ b/planetiler-custommap/src/main/java/com/onthegomap/planetiler/custommap/ConfiguredFeature.java
@@ -84,6 +84,7 @@ public class ConfiguredFeature {
     }
     processors.add(makeFeatureProcessor(feature.minZoom(), Integer.class, Feature::setMinZoom));
     processors.add(makeFeatureProcessor(feature.maxZoom(), Integer.class, Feature::setMaxZoom));
+    processors.add(makeFeatureProcessor(feature.minSize(), Double.class, Feature::setMinPixelSize));
 
     featureProcessors = processors.stream().filter(Objects::nonNull).toList();
   }
diff --git a/planetiler-custommap/src/main/java/com/onthegomap/planetiler/custommap/configschema/FeatureItem.java b/planetiler-custommap/src/main/java/com/onthegomap/planetiler/custommap/configschema/FeatureItem.java
index e695408f..151f9b23 100644
--- a/planetiler-custommap/src/main/java/com/onthegomap/planetiler/custommap/configschema/FeatureItem.java
+++ b/planetiler-custommap/src/main/java/com/onthegomap/planetiler/custommap/configschema/FeatureItem.java
@@ -9,6 +9,7 @@ public record FeatureItem(
   @JsonFormat(with = JsonFormat.Feature.ACCEPT_SINGLE_VALUE_AS_ARRAY) List<String> source,
   @JsonProperty("min_zoom") Object minZoom,
   @JsonProperty("max_zoom") Object maxZoom,
+  @JsonProperty("min_size") Object minSize,
   @JsonProperty(required = true) FeatureGeometry geometry,
   @JsonProperty("include_when") Object includeWhen,
   @JsonProperty("exclude_when") Object excludeWhen,
diff --git a/planetiler-custommap/src/main/java/com/onthegomap/planetiler/custommap/validator/SchemaSpecification.java b/planetiler-custommap/src/main/java/com/onthegomap/planetiler/custommap/validator/SchemaSpecification.java
index 5f0230cf..65385adc 100644
--- a/planetiler-custommap/src/main/java/com/onthegomap/planetiler/custommap/validator/SchemaSpecification.java
+++ b/planetiler-custommap/src/main/java/com/onthegomap/planetiler/custommap/validator/SchemaSpecification.java
@@ -55,6 +55,7 @@ public record SchemaSpecification(List<Example> examples) {
     GeometryType geometry,
     @JsonProperty("min_zoom") Integer minZoom,
     @JsonProperty("max_zoom") Integer maxZoom,
+    @JsonProperty("min_size") Double minSize,
     @JsonProperty("at_zoom") Integer atZoom,
     @JsonProperty("allow_extra_tags") Boolean allowExtraTags,
     @JsonProperty("tags") Map<String, Object> tags
diff --git a/planetiler-custommap/src/main/java/com/onthegomap/planetiler/custommap/validator/SchemaValidator.java b/planetiler-custommap/src/main/java/com/onthegomap/planetiler/custommap/validator/SchemaValidator.java
index 1964b963..431bda0c 100644
--- a/planetiler-custommap/src/main/java/com/onthegomap/planetiler/custommap/validator/SchemaValidator.java
+++ b/planetiler-custommap/src/main/java/com/onthegomap/planetiler/custommap/validator/SchemaValidator.java
@@ -208,6 +208,7 @@ public class SchemaValidator {
           validate(prefix + ".layer", issues, expected.layer(), actual.getLayer());
           validate(prefix + ".minzoom", issues, expected.minZoom(), actual.getMinZoom());
           validate(prefix + ".maxzoom", issues, expected.maxZoom(), actual.getMaxZoom());
+          validate(prefix + ".minsize", issues, expected.minSize(), actual.getMinPixelSizeAtZoom(expected.atZoom()));
           validate(prefix + ".geometry", issues, expected.geometry(), GeometryType.typeOf(actual.getGeometry()));
           Set<String> tags = new TreeSet<>(actualTags.keySet());
           expected.tags().forEach((tag, value) -> {
diff --git a/planetiler-custommap/src/main/resources/samples/shortbread.spec.yml b/planetiler-custommap/src/main/resources/samples/shortbread.spec.yml
index 245bf438..4ea4dbd8 100644
--- a/planetiler-custommap/src/main/resources/samples/shortbread.spec.yml
+++ b/planetiler-custommap/src/main/resources/samples/shortbread.spec.yml
@@ -221,6 +221,7 @@ examples:
   - layer: streets
     geometry: line
     min_zoom: 8
+    min_size: 0
     tags:
       bridge: false
       kind: primary
@@ -262,6 +263,7 @@ examples:
     geometry: line
     min_zoom: 8
     allow_extra_tags: false
+    min_size: 0
     tags:
       bridge: false
       kind: primary
@@ -291,6 +293,7 @@ examples:
     geometry: line
     min_zoom: 8
     allow_extra_tags: false
+    min_size: 0
     tags:
       bridge: false
       kind: rail
@@ -707,6 +710,7 @@ examples:
     layer: boundaries
     geometry: line
     min_zoom: 0
+    min_size: 0
     tags:
       maritime: true
       admin_level: 2
@@ -723,6 +727,7 @@ examples:
     layer: boundaries
     geometry: line
     min_zoom: 7
+    min_size: 0
     tags:
       maritime: false
       admin_level: 4
diff --git a/planetiler-custommap/src/main/resources/samples/shortbread.yml b/planetiler-custommap/src/main/resources/samples/shortbread.yml
index 6fdba1bb..83b81b52 100644
--- a/planetiler-custommap/src/main/resources/samples/shortbread.yml
+++ b/planetiler-custommap/src/main/resources/samples/shortbread.yml
@@ -132,6 +132,7 @@ layers:
   - source: osm
     geometry: line
     # TODO get min admin level from relations
+    min_size: 0
     min_zoom:
       default_value: 7
       overrides:
@@ -379,6 +380,7 @@ layers:
   features:
   - source: osm
     geometry: line
+    min_size: 0
     min_zoom:
       default_value: 13
       overrides:
diff --git a/planetiler-custommap/src/test/java/com/onthegomap/planetiler/custommap/ConfiguredFeatureTest.java b/planetiler-custommap/src/test/java/com/onthegomap/planetiler/custommap/ConfiguredFeatureTest.java
index 725ddb7e..564b97f8 100644
--- a/planetiler-custommap/src/test/java/com/onthegomap/planetiler/custommap/ConfiguredFeatureTest.java
+++ b/planetiler-custommap/src/test/java/com/onthegomap/planetiler/custommap/ConfiguredFeatureTest.java
@@ -1022,4 +1022,29 @@ class ConfiguredFeatureTest {
     )));
     assertEquals("example.com_file.osm.pbf", loadConfig(config).sources().get(0).defaultFileUrl());
   }
+
+  @ParameterizedTest
+  @CsvSource("""
+    10,10
+    ${10+1},11
+    ${feature.tags.key}|9
+    """)
+  void setMinSize(String input, double output) {
+    var config = """
+      sources:
+        osm:
+          type: osm
+          url: geofabrik:rhode-island
+          local_path: data/rhode-island.osm.pbf
+      layers:
+      - id: testLayer
+        features:
+        - source: osm
+          min_size: %s
+          geometry: line
+      """.formatted(input);
+    testLinestring(config, Map.of("key", 9), feature -> {
+      assertEquals(output, feature.getMinPixelSizeAtZoom(11));
+    }, 1);
+  }
 }
diff --git a/planetiler-custommap/src/test/java/com/onthegomap/planetiler/custommap/validator/SchemaValidatorTest.java b/planetiler-custommap/src/test/java/com/onthegomap/planetiler/custommap/validator/SchemaValidatorTest.java
index 5c38b6ed..eff36cc9 100644
--- a/planetiler-custommap/src/test/java/com/onthegomap/planetiler/custommap/validator/SchemaValidatorTest.java
+++ b/planetiler-custommap/src/test/java/com/onthegomap/planetiler/custommap/validator/SchemaValidatorTest.java
@@ -77,6 +77,7 @@ class SchemaValidatorTest {
       features:
       - source: osm
         geometry: polygon
+        min_size: 10
         include_when:
           natural: water
         attributes:
@@ -121,6 +122,9 @@ class SchemaValidatorTest {
     "true,water,polygon,natural: water,allow_extra_tags: false",
     "true,water,polygon,,allow_extra_tags: true",
     "false,water,polygon,,allow_extra_tags: false",
+
+    "true,water,polygon,,min_size: 10",
+    "false,water,polygon,,min_size: 9",
   })
   void testValidateWaterPolygon(boolean shouldBeOk, String layer, String geometry, String tags, String allowExtraTags)
     throws IOException {