diff --git a/android/bazel.go b/android/bazel.go
index 9939bd5..09a2c3a 100644
--- a/android/bazel.go
+++ b/android/bazel.go
@@ -14,19 +14,46 @@
 
 package android
 
-import "android/soong/bazel"
+import (
+	"fmt"
+	"io/ioutil"
+	"path/filepath"
+	"strings"
+
+	"github.com/google/blueprint/proptools"
+)
+
+type bazelModuleProperties struct {
+	// The label of the Bazel target replacing this Soong module. When run in conversion mode, this
+	// will import the handcrafted build target into the autogenerated file. Note: this may result in
+	// a conflict due to duplicate targets if bp2build_available is also set.
+	Label *string
+
+	// If true, bp2build will generate the converted Bazel target for this module. Note: this may
+	// cause a conflict due to the duplicate targets if label is also set.
+	Bp2build_available bool
+}
+
+// Properties contains common module properties for Bazel migration purposes.
+type properties struct {
+	// In USE_BAZEL_ANALYSIS=1 mode, this represents the Bazel target replacing
+	// this Soong module.
+	Bazel_module bazelModuleProperties
+}
 
 // BazelModuleBase contains the property structs with metadata for modules which can be converted to
 // Bazel.
 type BazelModuleBase struct {
-	bazelProperties bazel.Properties
+	bazelProperties properties
 }
 
 // Bazelable is specifies the interface for modules that can be converted to Bazel.
 type Bazelable interface {
-	bazelProps() *bazel.Properties
+	bazelProps() *properties
+	HasHandcraftedLabel() bool
 	GetBazelLabel() string
 	ConvertWithBp2build() bool
+	GetBazelBuildFileContents(c Config, path, name string) (string, error)
 }
 
 // BazelModule is a lightweight wrapper interface around Module for Bazel-convertible modules.
@@ -42,16 +69,48 @@
 }
 
 // bazelProps returns the Bazel properties for the given BazelModuleBase.
-func (b *BazelModuleBase) bazelProps() *bazel.Properties {
+func (b *BazelModuleBase) bazelProps() *properties {
 	return &b.bazelProperties
 }
 
+// HasHandcraftedLabel returns whether this module has a handcrafted Bazel label.
+func (b *BazelModuleBase) HasHandcraftedLabel() bool {
+	return b.bazelProperties.Bazel_module.Label != nil
+}
+
+// HandcraftedLabel returns the handcrafted label for this module, or empty string if there is none
+func (b *BazelModuleBase) HandcraftedLabel() string {
+	return proptools.String(b.bazelProperties.Bazel_module.Label)
+}
+
 // GetBazelLabel returns the Bazel label for the given BazelModuleBase.
 func (b *BazelModuleBase) GetBazelLabel() string {
-	return b.bazelProperties.Bazel_module.Label
+	return proptools.String(b.bazelProperties.Bazel_module.Label)
 }
 
 // ConvertWithBp2build returns whether the given BazelModuleBase should be converted with bp2build.
 func (b *BazelModuleBase) ConvertWithBp2build() bool {
 	return b.bazelProperties.Bazel_module.Bp2build_available
 }
+
+// GetBazelBuildFileContents returns the file contents of a hand-crafted BUILD file if available or
+// an error if there are errors reading the file.
+// TODO(b/181575318): currently we append the whole BUILD file, let's change that to do
+// something more targeted based on the rule type and target.
+func (b *BazelModuleBase) GetBazelBuildFileContents(c Config, path, name string) (string, error) {
+	if !strings.Contains(b.GetBazelLabel(), path) {
+		return "", fmt.Errorf("%q not found in bazel_module.label %q", path, b.GetBazelLabel())
+	}
+	name = filepath.Join(path, name)
+	f, err := c.fs.Open(name)
+	if err != nil {
+		return "", err
+	}
+	defer f.Close()
+
+	data, err := ioutil.ReadAll(f)
+	if err != nil {
+		return "", err
+	}
+	return string(data[:]), nil
+}
diff --git a/bazel/properties.go b/bazel/properties.go
index cb47758..abdc107 100644
--- a/bazel/properties.go
+++ b/bazel/properties.go
@@ -19,21 +19,6 @@
 	"sort"
 )
 
-type bazelModuleProperties struct {
-	// The label of the Bazel target replacing this Soong module.
-	Label string
-
-	// If true, bp2build will generate the converted Bazel target for this module.
-	Bp2build_available bool
-}
-
-// Properties contains common module properties for Bazel migration purposes.
-type Properties struct {
-	// In USE_BAZEL_ANALYSIS=1 mode, this represents the Bazel target replacing
-	// this Soong module.
-	Bazel_module bazelModuleProperties
-}
-
 // BazelTargetModuleProperties contain properties and metadata used for
 // Blueprint to BUILD file conversion.
 type BazelTargetModuleProperties struct {
diff --git a/bp2build/Android.bp b/bp2build/Android.bp
index 99d706c..c74f902 100644
--- a/bp2build/Android.bp
+++ b/bp2build/Android.bp
@@ -11,6 +11,7 @@
         "build_conversion.go",
         "bzl_conversion.go",
         "configurability.go",
+        "constants.go",
         "conversion.go",
         "metrics.go",
     ],
diff --git a/bp2build/bp2build.go b/bp2build/bp2build.go
index 7169d7e..97a5137 100644
--- a/bp2build/bp2build.go
+++ b/bp2build/bp2build.go
@@ -22,7 +22,7 @@
 
 // The Bazel bp2build code generator is responsible for writing .bzl files that are equivalent to
 // Android.bp files that are capable of being built with Bazel.
-func Codegen(ctx CodegenContext) CodegenMetrics {
+func Codegen(ctx *CodegenContext) CodegenMetrics {
 	outputDir := android.PathForOutput(ctx, "bp2build")
 	android.RemoveAllOutputDir(outputDir)
 
diff --git a/bp2build/build_conversion.go b/bp2build/build_conversion.go
index 7fa4996..962f278 100644
--- a/bp2build/build_conversion.go
+++ b/bp2build/build_conversion.go
@@ -99,9 +99,10 @@
 }
 
 type CodegenContext struct {
-	config  android.Config
-	context android.Context
-	mode    CodegenMode
+	config         android.Config
+	context        android.Context
+	mode           CodegenMode
+	additionalDeps []string
 }
 
 func (c *CodegenContext) Mode() CodegenMode {
@@ -137,14 +138,26 @@
 	}
 }
 
-func (ctx CodegenContext) AddNinjaFileDeps(...string) {}
-func (ctx CodegenContext) Config() android.Config     { return ctx.config }
-func (ctx CodegenContext) Context() android.Context   { return ctx.context }
+// AddNinjaFileDeps adds dependencies on the specified files to be added to the ninja manifest. The
+// primary builder will be rerun whenever the specified files are modified. Allows us to fulfill the
+// PathContext interface in order to add dependencies on hand-crafted BUILD files. Note: must also
+// call AdditionalNinjaDeps and add them manually to the ninja file.
+func (ctx *CodegenContext) AddNinjaFileDeps(deps ...string) {
+	ctx.additionalDeps = append(ctx.additionalDeps, deps...)
+}
+
+// AdditionalNinjaDeps returns additional ninja deps added by CodegenContext
+func (ctx *CodegenContext) AdditionalNinjaDeps() []string {
+	return ctx.additionalDeps
+}
+
+func (ctx *CodegenContext) Config() android.Config   { return ctx.config }
+func (ctx *CodegenContext) Context() android.Context { return ctx.context }
 
 // NewCodegenContext creates a wrapper context that conforms to PathContext for
 // writing BUILD files in the output directory.
-func NewCodegenContext(config android.Config, context android.Context, mode CodegenMode) CodegenContext {
-	return CodegenContext{
+func NewCodegenContext(config android.Config, context android.Context, mode CodegenMode) *CodegenContext {
+	return &CodegenContext{
 		context: context,
 		config:  config,
 		mode:    mode,
@@ -163,12 +176,14 @@
 	return attributes
 }
 
-func GenerateBazelTargets(ctx CodegenContext) (map[string]BazelTargets, CodegenMetrics) {
+func GenerateBazelTargets(ctx *CodegenContext) (map[string]BazelTargets, CodegenMetrics) {
 	buildFileToTargets := make(map[string]BazelTargets)
+	buildFileToAppend := make(map[string]bool)
 
 	// Simple metrics tracking for bp2build
-	totalModuleCount := 0
-	ruleClassCount := make(map[string]int)
+	metrics := CodegenMetrics{
+		RuleClassCount: make(map[string]int),
+	}
 
 	bpCtx := ctx.Context()
 	bpCtx.VisitAllModules(func(m blueprint.Module) {
@@ -177,13 +192,29 @@
 
 		switch ctx.Mode() {
 		case Bp2Build:
-			if b, ok := m.(android.BazelTargetModule); !ok {
-				// Only include regular Soong modules (non-BazelTargetModules) into the total count.
-				totalModuleCount += 1
-				return
+			if b, ok := m.(android.Bazelable); ok && b.HasHandcraftedLabel() {
+				metrics.handCraftedTargetCount += 1
+				metrics.TotalModuleCount += 1
+				pathToBuildFile := getBazelPackagePath(b)
+				// We are using the entire contents of handcrafted build file, so if multiple targets within
+				// a package have handcrafted targets, we only want to include the contents one time.
+				if _, exists := buildFileToAppend[pathToBuildFile]; exists {
+					return
+				}
+				var err error
+				t, err = getHandcraftedBuildContent(ctx, b, pathToBuildFile)
+				if err != nil {
+					panic(fmt.Errorf("Error converting %s: %s", bpCtx.ModuleName(m), err))
+				}
+				// TODO(b/181575318): currently we append the whole BUILD file, let's change that to do
+				// something more targeted based on the rule type and target
+				buildFileToAppend[pathToBuildFile] = true
+			} else if btm, ok := m.(android.BazelTargetModule); ok {
+				t = generateBazelTarget(bpCtx, m, btm)
+				metrics.RuleClassCount[t.ruleClass] += 1
 			} else {
-				t = generateBazelTarget(bpCtx, m, b)
-				ruleClassCount[t.ruleClass] += 1
+				metrics.TotalModuleCount += 1
+				return
 			}
 		case QueryView:
 			// Blocklist certain module types from being generated.
@@ -200,17 +231,34 @@
 		buildFileToTargets[dir] = append(buildFileToTargets[dir], t)
 	})
 
-	metrics := CodegenMetrics{
-		TotalModuleCount: totalModuleCount,
-		RuleClassCount:   ruleClassCount,
-	}
-
 	return buildFileToTargets, metrics
 }
 
-func generateBazelTarget(ctx bpToBuildContext, m blueprint.Module, b android.BazelTargetModule) BazelTarget {
-	ruleClass := b.RuleClass()
-	bzlLoadLocation := b.BzlLoadLocation()
+func getBazelPackagePath(b android.Bazelable) string {
+	label := b.GetBazelLabel()
+	pathToBuildFile := strings.TrimPrefix(label, "//")
+	pathToBuildFile = strings.Split(pathToBuildFile, ":")[0]
+	return pathToBuildFile
+}
+
+func getHandcraftedBuildContent(ctx *CodegenContext, b android.Bazelable, pathToBuildFile string) (BazelTarget, error) {
+	p := android.ExistentPathForSource(ctx, pathToBuildFile, HandcraftedBuildFileName)
+	if !p.Valid() {
+		return BazelTarget{}, fmt.Errorf("Could not find file %q for handcrafted target.", pathToBuildFile)
+	}
+	c, err := b.GetBazelBuildFileContents(ctx.Config(), pathToBuildFile, HandcraftedBuildFileName)
+	if err != nil {
+		return BazelTarget{}, err
+	}
+	// TODO(b/181575318): once this is more targeted, we need to include name, rule class, etc
+	return BazelTarget{
+		content: c,
+	}, nil
+}
+
+func generateBazelTarget(ctx bpToBuildContext, m blueprint.Module, btm android.BazelTargetModule) BazelTarget {
+	ruleClass := btm.RuleClass()
+	bzlLoadLocation := btm.BzlLoadLocation()
 
 	// extract the bazel attributes from the module.
 	props := getBuildProperties(ctx, m)
diff --git a/bp2build/build_conversion_test.go b/bp2build/build_conversion_test.go
index aa4fc1d..89acbe9 100644
--- a/bp2build/build_conversion_test.go
+++ b/bp2build/build_conversion_test.go
@@ -1221,3 +1221,157 @@
 		}
 	}
 }
+
+func TestCombineBuildFilesBp2buildTargets(t *testing.T) {
+	testCases := []struct {
+		description                        string
+		moduleTypeUnderTest                string
+		moduleTypeUnderTestFactory         android.ModuleFactory
+		moduleTypeUnderTestBp2BuildMutator func(android.TopDownMutatorContext)
+		preArchMutators                    []android.RegisterMutatorFunc
+		depsMutators                       []android.RegisterMutatorFunc
+		bp                                 string
+		expectedBazelTargets               []string
+		fs                                 map[string]string
+		dir                                string
+	}{
+		{
+			description:                        "filegroup bazel_module.label",
+			moduleTypeUnderTest:                "filegroup",
+			moduleTypeUnderTestFactory:         android.FileGroupFactory,
+			moduleTypeUnderTestBp2BuildMutator: android.FilegroupBp2Build,
+			bp: `filegroup {
+    name: "fg_foo",
+    bazel_module: { label: "//other:fg_foo" },
+}`,
+			expectedBazelTargets: []string{
+				`// BUILD file`,
+			},
+			fs: map[string]string{
+				"other/BUILD.bazel": `// BUILD file`,
+			},
+		},
+		{
+			description:                        "multiple bazel_module.label same BUILD",
+			moduleTypeUnderTest:                "filegroup",
+			moduleTypeUnderTestFactory:         android.FileGroupFactory,
+			moduleTypeUnderTestBp2BuildMutator: android.FilegroupBp2Build,
+			bp: `filegroup {
+    name: "fg_foo",
+    bazel_module: { label: "//other:fg_foo" },
+}
+
+filegroup {
+    name: "foo",
+    bazel_module: { label: "//other:foo" },
+}`,
+			expectedBazelTargets: []string{
+				`// BUILD file`,
+			},
+			fs: map[string]string{
+				"other/BUILD.bazel": `// BUILD file`,
+			},
+		},
+		{
+			description:                        "filegroup bazel_module.label and bp2build",
+			moduleTypeUnderTest:                "filegroup",
+			moduleTypeUnderTestFactory:         android.FileGroupFactory,
+			moduleTypeUnderTestBp2BuildMutator: android.FilegroupBp2Build,
+			bp: `filegroup {
+    name: "fg_foo",
+    bazel_module: {
+      label: "//other:fg_foo",
+      bp2build_available: true,
+    },
+}`,
+			expectedBazelTargets: []string{
+				`filegroup(
+    name = "fg_foo",
+)`,
+				`// BUILD file`,
+			},
+			fs: map[string]string{
+				"other/BUILD.bazel": `// BUILD file`,
+			},
+		},
+		{
+			description:                        "filegroup bazel_module.label and filegroup bp2build",
+			moduleTypeUnderTest:                "filegroup",
+			moduleTypeUnderTestFactory:         android.FileGroupFactory,
+			moduleTypeUnderTestBp2BuildMutator: android.FilegroupBp2Build,
+			bp: `filegroup {
+    name: "fg_foo",
+    bazel_module: {
+      label: "//other:fg_foo",
+    },
+}
+
+filegroup {
+    name: "fg_bar",
+    bazel_module: {
+      bp2build_available: true,
+    },
+}`,
+			expectedBazelTargets: []string{
+				`filegroup(
+    name = "fg_bar",
+)`,
+				`// BUILD file`,
+			},
+			fs: map[string]string{
+				"other/BUILD.bazel": `// BUILD file`,
+			},
+		},
+	}
+
+	dir := "."
+	for _, testCase := range testCases {
+		fs := make(map[string][]byte)
+		toParse := []string{
+			"Android.bp",
+		}
+		for f, content := range testCase.fs {
+			if strings.HasSuffix(f, "Android.bp") {
+				toParse = append(toParse, f)
+			}
+			fs[f] = []byte(content)
+		}
+		config := android.TestConfig(buildDir, nil, testCase.bp, fs)
+		ctx := android.NewTestContext(config)
+		ctx.RegisterModuleType(testCase.moduleTypeUnderTest, testCase.moduleTypeUnderTestFactory)
+		for _, m := range testCase.depsMutators {
+			ctx.DepsBp2BuildMutators(m)
+		}
+		ctx.RegisterBp2BuildMutator(testCase.moduleTypeUnderTest, testCase.moduleTypeUnderTestBp2BuildMutator)
+		ctx.RegisterForBazelConversion()
+
+		_, errs := ctx.ParseFileList(dir, toParse)
+		if Errored(t, testCase.description, errs) {
+			continue
+		}
+		_, errs = ctx.ResolveDependencies(config)
+		if Errored(t, testCase.description, errs) {
+			continue
+		}
+
+		checkDir := dir
+		if testCase.dir != "" {
+			checkDir = testCase.dir
+		}
+		bazelTargets := generateBazelTargetsForDir(NewCodegenContext(config, *ctx.Context, Bp2Build), checkDir)
+		if actualCount, expectedCount := len(bazelTargets), len(testCase.expectedBazelTargets); actualCount != expectedCount {
+			t.Errorf("%s: Expected %d bazel target, got %d\n%s", testCase.description, expectedCount, actualCount, bazelTargets)
+		} else {
+			for i, target := range bazelTargets {
+				if w, g := testCase.expectedBazelTargets[i], target.content; w != g {
+					t.Errorf(
+						"%s: Expected generated Bazel target to be '%s', got '%s'",
+						testCase.description,
+						w,
+						g,
+					)
+				}
+			}
+		}
+	}
+}
diff --git a/bp2build/constants.go b/bp2build/constants.go
new file mode 100644
index 0000000..23bca83
--- /dev/null
+++ b/bp2build/constants.go
@@ -0,0 +1,25 @@
+// Copyright 2020 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package bp2build
+
+var (
+	// When both a BUILD and BUILD.bazel file are exist in the same package, the BUILD.bazel file will
+	// be preferred for use within a Bazel build.
+
+	// The file name used for automatically generated files. Files with this name are ignored by git.
+	GeneratedBuildFileName = "BUILD"
+	// The file name used for hand-crafted build targets.
+	HandcraftedBuildFileName = "BUILD.bazel"
+)
diff --git a/bp2build/conversion.go b/bp2build/conversion.go
index 1225f2b..7877bb8 100644
--- a/bp2build/conversion.go
+++ b/bp2build/conversion.go
@@ -24,9 +24,9 @@
 	// Write top level files: WORKSPACE and BUILD. These files are empty.
 	files = append(files, newFile("", "WORKSPACE", ""))
 	// Used to denote that the top level directory is a package.
-	files = append(files, newFile("", "BUILD", ""))
+	files = append(files, newFile("", GeneratedBuildFileName, ""))
 
-	files = append(files, newFile(bazelRulesSubDir, "BUILD", ""))
+	files = append(files, newFile(bazelRulesSubDir, GeneratedBuildFileName, ""))
 
 	if mode == QueryView {
 		// These files are only used for queryview.
@@ -47,7 +47,14 @@
 	files := make([]BazelFile, 0, len(buildToTargets))
 	for _, dir := range android.SortedStringKeys(buildToTargets) {
 		targets := buildToTargets[dir]
-		sort.Slice(targets, func(i, j int) bool { return targets[i].name < targets[j].name })
+		sort.Slice(targets, func(i, j int) bool {
+			// this will cover all bp2build generated targets
+			if targets[i].name < targets[j].name {
+				return true
+			}
+			// give a strict ordering to content from hand-crafted targets
+			return targets[i].content < targets[j].content
+		})
 		content := soongModuleLoad
 		if mode == Bp2Build {
 			content = `# This file was automatically generated by bp2build for the Bazel migration project.
@@ -62,7 +69,7 @@
 			content += "\n\n"
 		}
 		content += targets.String()
-		files = append(files, newFile(dir, "BUILD", content))
+		files = append(files, newFile(dir, GeneratedBuildFileName, content))
 	}
 	return files
 }
diff --git a/bp2build/metrics.go b/bp2build/metrics.go
index 916129f..65b06c6 100644
--- a/bp2build/metrics.go
+++ b/bp2build/metrics.go
@@ -13,6 +13,9 @@
 
 	// Counts of generated Bazel targets per Bazel rule class
 	RuleClassCount map[string]int
+
+	// Total number of handcrafted targets
+	handCraftedTargetCount int
 }
 
 // Print the codegen metrics to stdout.
@@ -24,7 +27,8 @@
 		generatedTargetCount += count
 	}
 	fmt.Printf(
-		"[bp2build] Generated %d total BUILD targets from %d Android.bp modules.\n",
+		"[bp2build] Generated %d total BUILD targets and included %d handcrafted BUILD targets from %d Android.bp modules.\n",
 		generatedTargetCount,
+		metrics.handCraftedTargetCount,
 		metrics.TotalModuleCount)
 }
diff --git a/bp2build/testing.go b/bp2build/testing.go
index bd75a8f..a15a4a5 100644
--- a/bp2build/testing.go
+++ b/bp2build/testing.go
@@ -175,7 +175,7 @@
 }
 
 // Helper method for tests to easily access the targets in a dir.
-func generateBazelTargetsForDir(codegenCtx CodegenContext, dir string) BazelTargets {
+func generateBazelTargetsForDir(codegenCtx *CodegenContext, dir string) BazelTargets {
 	buildFileToTargets, _ := GenerateBazelTargets(codegenCtx)
 	return buildFileToTargets[dir]
 }
diff --git a/cmd/soong_build/main.go b/cmd/soong_build/main.go
index 4586f44..8322fbe 100644
--- a/cmd/soong_build/main.go
+++ b/cmd/soong_build/main.go
@@ -198,7 +198,6 @@
 	if err != nil {
 		panic(err)
 	}
-	extraNinjaDepsString := strings.Join(extraNinjaDeps, " \\\n ")
 
 	// Run the loading and analysis pipeline to prepare the graph of regular
 	// Modules parsed from Android.bp files, and the BazelTargetModules mapped
@@ -215,6 +214,9 @@
 	// 1:1 mapping for each module.
 	metrics.Print()
 
+	extraNinjaDeps = append(extraNinjaDeps, codegenContext.AdditionalNinjaDeps()...)
+	extraNinjaDepsString := strings.Join(extraNinjaDeps, " \\\n ")
+
 	// Workarounds to support running bp2build in a clean AOSP checkout with no
 	// prior builds, and exiting early as soon as the BUILD files get generated,
 	// therefore not creating build.ninja files that soong_ui and callers of
diff --git a/cmd/soong_build/queryview.go b/cmd/soong_build/queryview.go
index 0a77d67..edc8a42 100644
--- a/cmd/soong_build/queryview.go
+++ b/cmd/soong_build/queryview.go
@@ -22,7 +22,7 @@
 	"path/filepath"
 )
 
-func createBazelQueryView(ctx bp2build.CodegenContext, bazelQueryViewDir string) error {
+func createBazelQueryView(ctx *bp2build.CodegenContext, bazelQueryViewDir string) error {
 	ruleShims := bp2build.CreateRuleShims(android.ModuleTypeFactories())
 
 	// Ignore metrics reporting for queryview, since queryview is already a full-repo