diff --git a/Project.toml b/Project.toml
index 7beec7b5..390803d7 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,6 +1,6 @@
 name = "BlockArrays"
 uuid = "8e7c35d0-a365-5155-bbbb-fb81a777f24e"
-version = "1.0.0"
+version = "1.0.1"
 
 [deps]
 ArrayLayouts = "4c555306-a7a7-4459-81d9-ec55ddd5c99a"
diff --git a/ext/BlockArraysBandedMatricesExt.jl b/ext/BlockArraysBandedMatricesExt.jl
index 97e8e414..f085f6a8 100644
--- a/ext/BlockArraysBandedMatricesExt.jl
+++ b/ext/BlockArraysBandedMatricesExt.jl
@@ -2,9 +2,11 @@ module BlockArraysBandedMatricesExt
 
 using BandedMatrices, BlockArrays
 using BlockArrays.ArrayLayouts
-import BandedMatrices: isbanded, AbstractBandedLayout, bandeddata, bandwidths
-import BlockArrays: blockcolsupport, blockrowsupport, AbstractBlockedUnitRange
-import ArrayLayouts: sub_materialize
+using BlockArrays.LinearAlgebra
+import BandedMatrices: isbanded, AbstractBandedLayout, BandedColumns, bandeddata, bandwidths
+import BlockArrays: blockcolsupport, blockrowsupport, AbstractBlockedUnitRange, BlockLayout, BlockSlice1
+import ArrayLayouts: sub_materialize, _copyto!
+import Base: BroadcastStyle
 
 
 bandeddata(P::BlockedMatrix) = bandeddata(P.blocks)
@@ -25,6 +27,71 @@ end
 # ambiguity
 sub_materialize(::AbstractBandedLayout, V, ::Tuple{AbstractBlockedUnitRange,Base.OneTo{Int}}) = BandedMatrix(V)
 sub_materialize(::AbstractBandedLayout, V, ::Tuple{Base.OneTo{Int},AbstractBlockedUnitRange}) = BandedMatrix(V)
+sub_materialize(::AbstractBandedLayout, V, ::Tuple{AbstractBlockedUnitRange,AbstractBlockedUnitRange}) = BandedMatrix(V)
+
+
+# _copyto!
+# disabled as not clear its needed and used undefined colblockbandwidths
+
+# function _copyto!(_, ::BlockLayout{<:BandedColumns}, dest::AbstractMatrix, src::AbstractMatrix)
+#     if !blockisequal(axes(dest), axes(src))
+#         copyto!(BlockedArray(dest, axes(src)), src)
+#         return dest
+#     end
+
+#     srcB = blocks(src)
+#     srcD = bandeddata(srcB)
+
+#     dl, du = colblockbandwidths(dest)
+#     sl, su = bandwidths(srcB)
+#     M,N = size(srcB)
+#     # Source matrix must fit within bands of destination matrix
+#     all(dl .≥ min(sl,M-1)) && all(du .≥ min(su,N-1)) || throw(BandError(dest))
+
+#     for J = 1:N
+#         for K = max(1,J-du[J]):min(J-su-1,M)
+#             zero!(view(dest,Block(K),Block(J)))
+#         end
+#         for K = max(1,J-su):min(J+sl,M)
+#             copyto!(view(dest,Block(K),Block(J)), srcD[K-J+su+1,J])
+#         end
+#         for K = max(1,J+sl+1):min(J+dl[J],M)
+#             zero!(view(dest,Block(K),Block(J)))
+#         end
+#     end
+#     dest
+# end
+
+# function _copyto!(_, ::BlockLayout{<:AbstractBandedLayout}, dest::AbstractMatrix, src::AbstractMatrix)
+#     if !blockisequal(axes(dest), axes(src))
+#         copyto!(BlockedArray(dest, axes(src)), src)
+#         return dest
+#     end
+
+#     srcB = blocks(src)
+
+#     dl, du = colblockbandwidths(dest)
+#     sl, su = bandwidths(srcB)
+#     M,N = size(srcB)
+#     # Source matrix must fit within bands of destination matrix
+#     all(dl .≥ min(sl,M-1)) && all(du .≥ min(su,N-1)) || throw(BandError(dest))
+
+#     for J = 1:N
+#         for K = max(1,J-du[J]):min(J-su-1,M)
+#             zero!(view(dest,Block(K),Block(J)))
+#         end
+#         for K = max(1,J-su):min(J+sl,M)
+#             copyto!(view(dest,Block(K),Block(J)), inbands_getindex(srcB, K, J))
+#         end
+#         for K = max(1,J+sl+1):min(J+dl[J],M)
+#             zero!(view(dest,Block(K),Block(J)))
+#         end
+#     end
+#     dest
+# end
+
+## WARNING: type piracy
+# BroadcastStyle(::Type{<:SubArray{<:Any,2,<:BlockedMatrix{<:Any,<:Diagonal}, <:Tuple{<:BlockSlice1,<:BlockSlice1}}}) = BandedStyle()
 
 
 end
diff --git a/test/test_blockbanded.jl b/test/test_blockbanded.jl
index 0359ae4d..6fc20e4a 100644
--- a/test/test_blockbanded.jl
+++ b/test/test_blockbanded.jl
@@ -1,7 +1,7 @@
 module TestBlockArraysBandedMatrices
 
 using BlockArrays, LinearAlgebra, BandedMatrices, Test
-using BlockArrays: BlockDiagonal, BlockBidiagonal, BlockTridiagonal, blockcolsupport, blockrowsupport
+using BlockArrays: BlockDiagonal, BlockBidiagonal, BlockTridiagonal, blockcolsupport, blockrowsupport, BlockLayout
 using BandedMatrices: _BandedMatrix
 
 
@@ -70,6 +70,23 @@ using BandedMatrices: _BandedMatrix
         A = BlockedArray(brand(5,4,1,2), [3,2], [2,2])
         @test bandwidths(A) == (1,2)
         @test BandedMatrix(A) == A
+        @test copyto!(similar(A), A) == A
+    end
+
+    @testset "block banded" begin
+        B = BandedMatrix{Matrix{Float64}}(undef, (3, 4), (1,2))
+        for k = axes(B,1), j = max(1,k-1):min(4,k+2)
+            B[k,j] = randn(2,2)
+        end
+        A = BlockArrays._BlockArray(B, (blockedrange(fill(2,3)), blockedrange(fill(2,4))))
+        @test copyto!(zeros(size(A)), A) == Matrix(A)
+    end
+
+    @testset "Blocked Diagonal" begin
+        A = BlockedMatrix(Diagonal(1:5), [2,3], [2,2,1])
+        @test A[Block(2,2)] isa BandedMatrix
+        @test bandwidths(A[Block(2,2)]) == (0,0)
+        @test A[Block.(1:2), Block.(2:3)] isa BandedMatrix
     end
 end