diff --git a/redwood-lazylayout-compose/src/commonMain/kotlin/app/cash/redwood/lazylayout/compose/LazyDsl.kt b/redwood-lazylayout-compose/src/commonMain/kotlin/app/cash/redwood/lazylayout/compose/LazyDsl.kt
index 4d9396b0d7..656a0fcbbe 100644
--- a/redwood-lazylayout-compose/src/commonMain/kotlin/app/cash/redwood/lazylayout/compose/LazyDsl.kt
+++ b/redwood-lazylayout-compose/src/commonMain/kotlin/app/cash/redwood/lazylayout/compose/LazyDsl.kt
@@ -18,6 +18,7 @@ package app.cash.redwood.lazylayout.compose
 import androidx.compose.runtime.Composable
 import app.cash.redwood.LayoutScopeMarker
 import app.cash.redwood.Modifier
+import app.cash.redwood.layout.api.Constraint
 
 @LayoutScopeMarker
 public interface LazyListScope {
@@ -70,12 +71,16 @@ public annotation class ExperimentalRedwoodLazyLayoutApi
 
 @Composable
 public fun LazyRow(
+  width: Constraint = Constraint.Wrap,
+  height: Constraint = Constraint.Wrap,
   modifier: Modifier = Modifier,
   placeholder: @Composable () -> Unit,
   content: LazyListScope.() -> Unit,
 ) {
   LazyList(
     isVertical = false,
+    width = width,
+    height = height,
     modifier = modifier,
     placeholder = placeholder,
     content = content,
@@ -87,6 +92,8 @@ public fun LazyRow(
 public fun LazyRow(
   refreshing: Boolean,
   onRefresh: (() -> Unit)?,
+  width: Constraint = Constraint.Wrap,
+  height: Constraint = Constraint.Wrap,
   modifier: Modifier = Modifier,
   placeholder: @Composable () -> Unit,
   content: LazyListScope.() -> Unit,
@@ -95,6 +102,8 @@ public fun LazyRow(
     isVertical = false,
     refreshing = refreshing,
     onRefresh = onRefresh,
+    width = width,
+    height = height,
     modifier = modifier,
     placeholder = placeholder,
     content = content,
@@ -103,12 +112,16 @@ public fun LazyRow(
 
 @Composable
 public fun LazyColumn(
+  width: Constraint = Constraint.Wrap,
+  height: Constraint = Constraint.Wrap,
   modifier: Modifier = Modifier,
   placeholder: @Composable () -> Unit,
   content: LazyListScope.() -> Unit,
 ) {
   LazyList(
     isVertical = true,
+    width = width,
+    height = height,
     modifier = modifier,
     placeholder = placeholder,
     content = content,
@@ -120,6 +133,8 @@ public fun LazyColumn(
 public fun LazyColumn(
   refreshing: Boolean,
   onRefresh: (() -> Unit)?,
+  width: Constraint = Constraint.Wrap,
+  height: Constraint = Constraint.Wrap,
   modifier: Modifier = Modifier,
   placeholder: @Composable () -> Unit,
   content: LazyListScope.() -> Unit,
@@ -128,6 +143,8 @@ public fun LazyColumn(
     isVertical = true,
     refreshing = refreshing,
     onRefresh = onRefresh,
+    width = width,
+    height = height,
     modifier = modifier,
     placeholder = placeholder,
     content = content,
diff --git a/redwood-lazylayout-compose/src/commonMain/kotlin/app/cash/redwood/lazylayout/compose/LazyList.kt b/redwood-lazylayout-compose/src/commonMain/kotlin/app/cash/redwood/lazylayout/compose/LazyList.kt
index 2fb402d2a9..50624f8000 100644
--- a/redwood-lazylayout-compose/src/commonMain/kotlin/app/cash/redwood/lazylayout/compose/LazyList.kt
+++ b/redwood-lazylayout-compose/src/commonMain/kotlin/app/cash/redwood/lazylayout/compose/LazyList.kt
@@ -24,6 +24,7 @@ import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
 import app.cash.redwood.Modifier
+import app.cash.redwood.layout.api.Constraint
 import kotlin.jvm.JvmName
 
 private const val OffscreenItemsBufferCount = 30
@@ -31,6 +32,8 @@ private const val OffscreenItemsBufferCount = 30
 @Composable
 internal fun LazyList(
   isVertical: Boolean,
+  width: Constraint,
+  height: Constraint,
   modifier: Modifier = Modifier,
   placeholder: @Composable () -> Unit,
   content: LazyListScope.() -> Unit,
@@ -48,6 +51,8 @@ internal fun LazyList(
       firstVisibleItemIndex = localFirstVisibleItemIndex
       lastVisibleItemIndex = localLastVisibleItemIndex
     },
+    width = width,
+    height = height,
     modifier = modifier,
     placeholder = { repeat(75) { placeholder() } },
     items = {
@@ -65,6 +70,8 @@ internal fun RefreshableLazyList(
   isVertical: Boolean,
   refreshing: Boolean = false,
   onRefresh: (() -> Unit)? = null,
+  width: Constraint,
+  height: Constraint,
   modifier: Modifier = Modifier,
   placeholder: @Composable () -> Unit,
   content: LazyListScope.() -> Unit,
@@ -84,6 +91,8 @@ internal fun RefreshableLazyList(
     },
     refreshing = refreshing,
     onRefresh = onRefresh,
+    width = width,
+    height = height,
     modifier = modifier,
     placeholder = { repeat(75) { placeholder() } },
     items = {
diff --git a/redwood-lazylayout-composeui/src/commonMain/kotlin/app/cash/redwood/lazylayout/composeui/ComposeUiLazyList.kt b/redwood-lazylayout-composeui/src/commonMain/kotlin/app/cash/redwood/lazylayout/composeui/ComposeUiLazyList.kt
index 6d03d2bfd0..1d4d3dcdf2 100644
--- a/redwood-lazylayout-composeui/src/commonMain/kotlin/app/cash/redwood/lazylayout/composeui/ComposeUiLazyList.kt
+++ b/redwood-lazylayout-composeui/src/commonMain/kotlin/app/cash/redwood/lazylayout/composeui/ComposeUiLazyList.kt
@@ -37,6 +37,7 @@ import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import app.cash.redwood.Modifier as RedwoodModifier
+import app.cash.redwood.layout.api.Constraint
 import app.cash.redwood.lazylayout.widget.LazyList
 import app.cash.redwood.lazylayout.widget.RefreshableLazyList
 import app.cash.redwood.widget.compose.ComposeWidgetChildren
@@ -51,6 +52,8 @@ internal class ComposeUiLazyList :
   private var itemsAfter by mutableStateOf(0)
   private var isRefreshing by mutableStateOf(false)
   private var onRefresh: (() -> Unit)? by mutableStateOf(null)
+  private var width by mutableStateOf(Constraint.Wrap)
+  private var height by mutableStateOf(Constraint.Wrap)
 
   override var modifier: RedwoodModifier = RedwoodModifier
 
@@ -82,6 +85,14 @@ internal class ComposeUiLazyList :
     this.onRefresh = onRefresh
   }
 
+  override fun width(width: Constraint) {
+    this.width = width
+  }
+
+  override fun height(height: Constraint) {
+    this.height = height
+  }
+
   override val value = @Composable {
     val content: LazyListScope.() -> Unit = {
       items(items.widgets) { item ->
@@ -117,20 +128,20 @@ internal class ComposeUiLazyList :
         }
       }
 
+      val modifier = Modifier
+        .run { if (width == Constraint.Fill) fillMaxWidth() else this }
+        .run { if (height == Constraint.Fill) fillMaxHeight() else this }
+        .pullRefresh(state = refreshState, enabled = onRefresh != null)
       if (isVertical) {
         LazyColumn(
-          modifier = Modifier
-            .fillMaxWidth()
-            .pullRefresh(state = refreshState, enabled = onRefresh != null),
+          modifier = modifier,
           state = state,
           horizontalAlignment = Alignment.CenterHorizontally,
           content = content,
         )
       } else {
         LazyRow(
-          modifier = Modifier
-            .fillMaxHeight()
-            .pullRefresh(state = refreshState, enabled = onRefresh != null),
+          modifier = modifier,
           state = state,
           verticalAlignment = Alignment.CenterVertically,
           content = content,
diff --git a/redwood-lazylayout-schema/build.gradle b/redwood-lazylayout-schema/build.gradle
index c9555f15eb..b358da9784 100644
--- a/redwood-lazylayout-schema/build.gradle
+++ b/redwood-lazylayout-schema/build.gradle
@@ -6,6 +6,10 @@ redwoodBuild {
   publishing()
 }
 
+dependencies {
+  api projects.redwoodLayoutApi
+}
+
 redwoodSchema {
   type = 'app.cash.redwood.lazylayout.RedwoodLazyLayout'
 }
diff --git a/redwood-lazylayout-schema/src/main/kotlin/app/cash/redwood/lazylayout/widgets.kt b/redwood-lazylayout-schema/src/main/kotlin/app/cash/redwood/lazylayout/widgets.kt
index 1800b0a91b..77a31ebd8e 100644
--- a/redwood-lazylayout-schema/src/main/kotlin/app/cash/redwood/lazylayout/widgets.kt
+++ b/redwood-lazylayout-schema/src/main/kotlin/app/cash/redwood/lazylayout/widgets.kt
@@ -15,6 +15,7 @@
  */
 package app.cash.redwood.lazylayout
 
+import app.cash.redwood.layout.api.Constraint
 import app.cash.redwood.schema.Children
 import app.cash.redwood.schema.Property
 import app.cash.redwood.schema.Widget
@@ -25,6 +26,8 @@ public data class LazyList(
   @Property(2) val onViewportChanged: (firstVisibleItemIndex: Int, lastVisibleItemIndex: Int) -> Unit,
   @Property(3) val itemsBefore: Int,
   @Property(4) val itemsAfter: Int,
+  @Property(5) val width: Constraint,
+  @Property(6) val height: Constraint,
   @Children(1) val placeholder: () -> Unit,
   @Children(2) val items: () -> Unit,
 )
@@ -37,6 +40,8 @@ public data class RefreshableLazyList(
   @Property(4) val itemsAfter: Int,
   @Property(5) val refreshing: Boolean,
   @Property(6) val onRefresh: (() -> Unit)?,
+  @Property(7) val width: Constraint,
+  @Property(8) val height: Constraint,
   @Children(1) val placeholder: () -> Unit,
   @Children(2) val items: () -> Unit,
 )
diff --git a/redwood-lazylayout-uiview/src/commonMain/kotlin/app/cash/redwood/lazylayout/uiview/UIViewLazyList.kt b/redwood-lazylayout-uiview/src/commonMain/kotlin/app/cash/redwood/lazylayout/uiview/UIViewLazyList.kt
index e5d8ed2588..8cc0d39244 100644
--- a/redwood-lazylayout-uiview/src/commonMain/kotlin/app/cash/redwood/lazylayout/uiview/UIViewLazyList.kt
+++ b/redwood-lazylayout-uiview/src/commonMain/kotlin/app/cash/redwood/lazylayout/uiview/UIViewLazyList.kt
@@ -21,6 +21,7 @@
 package app.cash.redwood.lazylayout.uiview
 
 import app.cash.redwood.Modifier
+import app.cash.redwood.layout.api.Constraint
 import app.cash.redwood.lazylayout.widget.LazyList
 import app.cash.redwood.lazylayout.widget.RefreshableLazyList
 import app.cash.redwood.widget.MutableListChildren
@@ -142,6 +143,13 @@ internal open class UIViewLazyListImpl() : LazyList<UIView> {
     this.itemsAfter = itemsAfter
   }
 
+  // TODO Dynamically update width and height of UIViewLazyList when set
+  override fun width(width: Constraint) {
+  }
+
+  override fun height(height: Constraint) {
+  }
+
   override var modifier: Modifier = Modifier
 
   override val value: UIView get() = tableView
diff --git a/redwood-lazylayout-view/src/main/kotlin/app/cash/redwood/lazylayout/view/ViewLazyList.kt b/redwood-lazylayout-view/src/main/kotlin/app/cash/redwood/lazylayout/view/ViewLazyList.kt
index bc6b51ce09..1eb159cfb6 100644
--- a/redwood-lazylayout-view/src/main/kotlin/app/cash/redwood/lazylayout/view/ViewLazyList.kt
+++ b/redwood-lazylayout-view/src/main/kotlin/app/cash/redwood/lazylayout/view/ViewLazyList.kt
@@ -24,10 +24,12 @@ import android.view.ViewGroup.LayoutParams.MATCH_PARENT
 import android.view.ViewGroup.LayoutParams.WRAP_CONTENT
 import android.widget.FrameLayout
 import androidx.core.view.doOnDetach
+import androidx.core.view.updateLayoutParams
 import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.recyclerview.widget.RecyclerView
 import androidx.swiperefreshlayout.widget.SwipeRefreshLayout
 import app.cash.redwood.Modifier
+import app.cash.redwood.layout.api.Constraint
 import app.cash.redwood.lazylayout.widget.LazyList
 import app.cash.redwood.lazylayout.widget.RefreshableLazyList
 import app.cash.redwood.widget.MutableListChildren
@@ -123,11 +125,8 @@ internal open class ViewLazyListImpl(
   init {
     adapter.items = items
     recyclerView.apply {
-      setHasFixedSize(true)
       layoutManager = linearLayoutManager
-
-      // TODO: sizing should be controlled by Modifiers
-      layoutParams = ViewGroup.LayoutParams(MATCH_PARENT, MATCH_PARENT)
+      layoutParams = ViewGroup.LayoutParams(WRAP_CONTENT, WRAP_CONTENT)
 
       addOnScrollListener(
         object : RecyclerView.OnScrollListener() {
@@ -144,6 +143,18 @@ internal open class ViewLazyListImpl(
     recyclerView.adapter = adapter
   }
 
+  override fun width(width: Constraint) {
+    recyclerView.updateLayoutParams {
+      this.width = if (width == Constraint.Fill) MATCH_PARENT else WRAP_CONTENT
+    }
+  }
+
+  override fun height(height: Constraint) {
+    recyclerView.updateLayoutParams {
+      this.height = if (height == Constraint.Fill) MATCH_PARENT else WRAP_CONTENT
+    }
+  }
+
   override fun isVertical(isVertical: Boolean) {
     linearLayoutManager.orientation = if (isVertical) RecyclerView.VERTICAL else RecyclerView.HORIZONTAL
   }
@@ -241,6 +252,7 @@ internal class RefreshableViewLazyListImpl(
   init {
     swipeRefreshLayout.apply {
       addView(recyclerView)
+      // TODO Dynamically update width and height of RefreshableViewLazyList when set
       layoutParams = ViewGroup.LayoutParams(MATCH_PARENT, MATCH_PARENT)
     }
   }
diff --git a/redwood-lazylayout-widget/build.gradle b/redwood-lazylayout-widget/build.gradle
index c9249faaac..ca0d228fe7 100644
--- a/redwood-lazylayout-widget/build.gradle
+++ b/redwood-lazylayout-widget/build.gradle
@@ -10,6 +10,14 @@ redwoodBuild {
 
 kotlin {
   KmpTargets.addAllTargets(project)
+
+  sourceSets {
+    commonMain {
+      dependencies {
+        api projects.redwoodLayoutModifiers
+      }
+    }
+  }
 }
 
 redwoodSchema {
diff --git a/samples/emoji-search/browser/src/main/kotlin/com/example/redwood/emojisearch/browser/main.kt b/samples/emoji-search/browser/src/main/kotlin/com/example/redwood/emojisearch/browser/main.kt
index 4a693d41c1..95a31557b2 100644
--- a/samples/emoji-search/browser/src/main/kotlin/com/example/redwood/emojisearch/browser/main.kt
+++ b/samples/emoji-search/browser/src/main/kotlin/com/example/redwood/emojisearch/browser/main.kt
@@ -19,6 +19,7 @@ import androidx.compose.runtime.Composable
 import app.cash.redwood.Modifier
 import app.cash.redwood.compose.RedwoodComposition
 import app.cash.redwood.compose.WindowAnimationFrameClock
+import app.cash.redwood.layout.api.Constraint
 import app.cash.redwood.layout.compose.Column
 import app.cash.redwood.layout.dom.HTMLElementRedwoodLayoutWidgetFactory
 import app.cash.redwood.lazylayout.widget.RedwoodLazyLayoutWidgetFactory
@@ -82,11 +83,17 @@ private object TruncatingColumnProvider : ColumnProvider {
     items: List<T>,
     refreshing: Boolean,
     onRefresh: (() -> Unit)?,
+    width: Constraint,
+    height: Constraint,
     modifier: Modifier,
     placeholder: @Composable () -> Unit,
     itemContent: @Composable (item: T) -> Unit,
   ) {
-    Column(modifier = modifier) {
+    Column(
+      width = width,
+      height = height,
+      modifier = modifier,
+    ) {
       for (item in items.take(25)) {
         itemContent(item)
       }
diff --git a/samples/emoji-search/presenter/src/commonMain/kotlin/com/example/redwood/emojisearch/presenter/EmojiSearch.kt b/samples/emoji-search/presenter/src/commonMain/kotlin/com/example/redwood/emojisearch/presenter/EmojiSearch.kt
index 5b0e5b78dd..730c79eac5 100644
--- a/samples/emoji-search/presenter/src/commonMain/kotlin/com/example/redwood/emojisearch/presenter/EmojiSearch.kt
+++ b/samples/emoji-search/presenter/src/commonMain/kotlin/com/example/redwood/emojisearch/presenter/EmojiSearch.kt
@@ -58,6 +58,8 @@ interface ColumnProvider {
     items: List<T>,
     refreshing: Boolean,
     onRefresh: (() -> Unit)?,
+    width: Constraint,
+    height: Constraint,
     modifier: Modifier,
     placeholder: @Composable () -> Unit,
     itemContent: @Composable (item: T) -> Unit,
@@ -113,6 +115,8 @@ fun EmojiSearch(
       items = filteredEmojis,
       refreshing = refreshing,
       onRefresh = { refreshSignal++ },
+      width = Constraint.Fill,
+      height = Constraint.Wrap,
       modifier = Modifier.grow(1.0),
       placeholder = {
         Item(
diff --git a/samples/emoji-search/presenter/src/jsMain/kotlin/com/example/redwood/emojisearch/presenter/EmojiSearchTreehouseUi.kt b/samples/emoji-search/presenter/src/jsMain/kotlin/com/example/redwood/emojisearch/presenter/EmojiSearchTreehouseUi.kt
index 833dd3ee32..fc32e00c8c 100644
--- a/samples/emoji-search/presenter/src/jsMain/kotlin/com/example/redwood/emojisearch/presenter/EmojiSearchTreehouseUi.kt
+++ b/samples/emoji-search/presenter/src/jsMain/kotlin/com/example/redwood/emojisearch/presenter/EmojiSearchTreehouseUi.kt
@@ -17,6 +17,7 @@ package com.example.redwood.emojisearch.presenter
 
 import androidx.compose.runtime.Composable
 import app.cash.redwood.Modifier
+import app.cash.redwood.layout.api.Constraint
 import app.cash.redwood.lazylayout.compose.ExperimentalRedwoodLazyLayoutApi
 import app.cash.redwood.treehouse.TreehouseUi
 import app.cash.redwood.lazylayout.compose.LazyColumn
@@ -40,6 +41,8 @@ private class LazyColumnProvider : ColumnProvider {
     items: List<T>,
     refreshing: Boolean,
     onRefresh: (() -> Unit)?,
+    width: Constraint,
+    height: Constraint,
     modifier: Modifier,
     placeholder: @Composable () -> Unit,
     itemContent: @Composable (item: T) -> Unit,
@@ -47,6 +50,8 @@ private class LazyColumnProvider : ColumnProvider {
     LazyColumn(
       refreshing = refreshing,
       onRefresh = onRefresh,
+      width = width,
+      height = height,
       modifier = modifier,
       placeholder = placeholder,
     ) {
diff --git a/samples/repo-search/presenter/src/commonMain/kotlin/com/example/redwood/reposearch/presenter/RepoSearchTreehouseUi.kt b/samples/repo-search/presenter/src/commonMain/kotlin/com/example/redwood/reposearch/presenter/RepoSearchTreehouseUi.kt
index bb6fe6345b..08d047e9a6 100644
--- a/samples/repo-search/presenter/src/commonMain/kotlin/com/example/redwood/reposearch/presenter/RepoSearchTreehouseUi.kt
+++ b/samples/repo-search/presenter/src/commonMain/kotlin/com/example/redwood/reposearch/presenter/RepoSearchTreehouseUi.kt
@@ -24,6 +24,7 @@ import app.cash.paging.PagingSourceLoadResult
 import app.cash.paging.PagingSourceLoadResultPage
 import app.cash.paging.PagingState
 import app.cash.paging.compose.collectAsLazyPagingItems
+import app.cash.redwood.layout.api.Constraint
 import app.cash.redwood.lazylayout.compose.LazyColumn
 import app.cash.redwood.treehouse.TreehouseUi
 import kotlinx.serialization.json.Json
@@ -46,7 +47,10 @@ class RepoSearchTreehouseUi(
   @Composable
   override fun Show() {
     val lazyPagingItems = pager.flow.collectAsLazyPagingItems()
-    LazyColumn(placeholder = { RepoSearch(Repository(fullName = "Placeholder…", 0)) }) {
+    LazyColumn(
+      width = Constraint.Fill,
+      placeholder = { RepoSearch(Repository(fullName = "Placeholder…", 0)) },
+    ) {
       items(lazyPagingItems.itemCount) { index ->
         RepoSearch(lazyPagingItems[index]!!)
       }