diff --git a/src/fusiontrees/braiding_manipulations.jl b/src/fusiontrees/braiding_manipulations.jl
index 7b4cdae4d..12926269c 100644
--- a/src/fusiontrees/braiding_manipulations.jl
+++ b/src/fusiontrees/braiding_manipulations.jl
@@ -215,7 +215,7 @@ braid, but a general braid can be obtained by combining such operations.
 braid(f::FusionTree{I, N}, p::IndexTuple{N}, levels::IndexTuple{N}) where {I, N} =
     braid(f, (p, ()), (levels, ()))
 function braid(f::FusionTree{I, N}, (p, _)::Index2Tuple{N, 0}, (levels, _)::Index2Tuple{N, 0}) where {I, N}
-    TupleTools.isperm(p) || throw(ArgumentError("not a valid permutation: $p"))
+    TupleTools.isperm(p) || throw(ArgumentError(lazy"not a valid permutation: $p"))
     @assert FusionStyle(I) isa UniqueFusion
     if BraidingStyle(I) isa SymmetricBraiding # this assumes Fsymbols are 1!
         coeff = one(sectorscalartype(I))
diff --git a/src/spaces/cartesianspace.jl b/src/spaces/cartesianspace.jl
index 6f60e9802..46729b979 100644
--- a/src/spaces/cartesianspace.jl
+++ b/src/spaces/cartesianspace.jl
@@ -59,7 +59,7 @@ unitspace(::Type{CartesianSpace}) = CartesianSpace(1)
 zerospace(::Type{CartesianSpace}) = CartesianSpace(0)
 ⊕(V₁::CartesianSpace, V₂::CartesianSpace) = CartesianSpace(V₁.d + V₂.d)
 function ⊖(V::CartesianSpace, W::CartesianSpace)
-    V ≿ W || throw(ArgumentError("$(W) is not a subspace of $(V)"))
+    V ≿ W || throw(ArgumentError(lazy"$(W) is not a subspace of $(V)"))
     return CartesianSpace(dim(V) - dim(W))
 end
 
diff --git a/src/spaces/complexspace.jl b/src/spaces/complexspace.jl
index 4b648432f..cb58279e9 100644
--- a/src/spaces/complexspace.jl
+++ b/src/spaces/complexspace.jl
@@ -60,7 +60,7 @@ function ⊕(V₁::ComplexSpace, V₂::ComplexSpace)
 end
 function ⊖(V::ComplexSpace, W::ComplexSpace)
     (V ≿ W && isdual(V) == isdual(W)) ||
-        throw(ArgumentError("$(W) is not a subspace of $(V)"))
+        throw(ArgumentError(lazy"$(W) is not a subspace of $(V)"))
     return ComplexSpace(dim(V) - dim(W), isdual(V))
 end
 
diff --git a/src/spaces/deligne.jl b/src/spaces/deligne.jl
index 5a5a2d71a..5417eb649 100644
--- a/src/spaces/deligne.jl
+++ b/src/spaces/deligne.jl
@@ -77,5 +77,5 @@ function ⊠(P₀::ProductSpace{<:ElementarySpace, 0}, P::ProductSpace{<:Element
 end
 
 @noinline function throw_incompatible_fields(P₁, P₂)
-    throw(ArgumentError("Deligne products require spaces over the same field: $(field(P₁)) ≠ $(field(P₂))"))
+    throw(ArgumentError(lazy"Deligne products require spaces over the same field: $(field(P₁)) ≠ $(field(P₂))"))
 end
diff --git a/src/spaces/generalspace.jl b/src/spaces/generalspace.jl
index 1ddfbc2d2..f35d6d6b0 100644
--- a/src/spaces/generalspace.jl
+++ b/src/spaces/generalspace.jl
@@ -16,7 +16,7 @@ struct GeneralSpace{𝔽} <: ElementarySpace
         return if 𝔽 isa Field
             new{𝔽}(Int(d), dual, (𝔽 ⊆ ℝ) ? false : conj)
         else
-            throw(ArgumentError("Unrecognised scalar field: $𝔽"))
+            throw(ArgumentError(lazy"Unrecognised scalar field: $𝔽"))
         end
     end
 end
diff --git a/src/spaces/gradedspace.jl b/src/spaces/gradedspace.jl
index 8bde2fa04..ed70bf884 100644
--- a/src/spaces/gradedspace.jl
+++ b/src/spaces/gradedspace.jl
@@ -35,8 +35,8 @@ function GradedSpace{I, NTuple{N, Int}}(dims; dual::Bool = false) where {I, N}
     for (c, dc) in dims
         k = convert(I, c)
         i = findindex(values(I), k)
-        k = dc < 0 && throw(ArgumentError("Sector $k has negative dimension $dc"))
-        isset[i] && throw(ArgumentError("Sector $c appears multiple times"))
+        k = dc < 0 && throw(ArgumentError(lazy"Sector $k has negative dimension $dc"))
+        isset[i] && throw(ArgumentError(lazy"Sector $c appears multiple times"))
         isset = TupleTools.setindex(isset, true, i)
         d = TupleTools.setindex(d, dc, i)
     end
@@ -50,8 +50,8 @@ function GradedSpace{I, SectorDict{I, Int}}(dims; dual::Bool = false) where {I <
     d = SectorDict{I, Int}()
     for (c, dc) in dims
         k = convert(I, c)
-        haskey(d, k) && throw(ArgumentError("Sector $k appears multiple times"))
-        dc < 0 && throw(ArgumentError("Sector $k has negative dimension $dc"))
+        haskey(d, k) && throw(ArgumentError(lazy"Sector $k appears multiple times"))
+        dc < 0 && throw(ArgumentError(lazy"Sector $k has negative dimension $dc"))
         !iszero(dc) && push!(d, k => dc)
     end
     return GradedSpace{I, SectorDict{I, Int}}(d, dual)
diff --git a/src/spaces/vectorspaces.jl b/src/spaces/vectorspaces.jl
index 18bdad69c..01dc00390 100644
--- a/src/spaces/vectorspaces.jl
+++ b/src/spaces/vectorspaces.jl
@@ -172,7 +172,7 @@ function leftunitspace(V::ElementarySpace)
     else
         !isempty(sectors(V)) || throw(ArgumentError("Cannot determine the left unit of an empty space"))
         _allequal(leftunit, sectors(V)) ||
-            throw(ArgumentError("sectors of $V do not have the same left unit"))
+            throw(ArgumentError(lazy"sectors of $V do not have the same left unit"))
 
         sector = leftunit(first(sectors(V)))
         return spacetype(V)(sector => 1)
@@ -194,7 +194,7 @@ function rightunitspace(V::ElementarySpace)
     else
         !isempty(sectors(V)) || throw(ArgumentError("Cannot determine the right unit of an empty space"))
         _allequal(rightunit, sectors(V)) ||
-            throw(ArgumentError("sectors of $V do not have the same right unit"))
+            throw(ArgumentError(lazy"sectors of $V do not have the same right unit"))
 
         sector = rightunit(first(sectors(V)))
         return spacetype(V)(sector => 1)
diff --git a/src/tensors/abstracttensor.jl b/src/tensors/abstracttensor.jl
index edbcfe662..f3b6fa18a 100644
--- a/src/tensors/abstracttensor.jl
+++ b/src/tensors/abstracttensor.jl
@@ -95,9 +95,9 @@ similarstoragetype(t, ::Type{T}) where {T <: Number} = similarstoragetype(typeof
 
 # avoid infinite recursion
 similarstoragetype(X::Type) =
-    throw(ArgumentError("Cannot determine a storagetype for tensor / array type `$X`"))
+    throw(ArgumentError(lazy"Cannot determine a storagetype for tensor / array type `$X`"))
 similarstoragetype(X::Type, ::Type{T}) where {T <: Number} =
-    throw(ArgumentError("Cannot determine a storagetype for tensor / array type `$X` and/or scalar type `$T`"))
+    throw(ArgumentError(lazy"Cannot determine a storagetype for tensor / array type `$X` and/or scalar type `$T`"))
 
 # implement on tensors
 similarstoragetype(::Type{TT}) where {TT <: AbstractTensorMap} = similarstoragetype(storagetype(TT))
@@ -184,11 +184,11 @@ promote_storage_rule(::Type{T}, ::Type{Base.Bottom}, slurp...) where {T} = T
 promote_storage_result(::Type, ::Type, ::Type{T}, ::Type{S}) where {T, S} = (@inline; promote_storagetype(T, S))
 # If no promote_storage_rule is defined, both directions give Bottom => error
 promote_storage_result(T::Type, S::Type, ::Type{Base.Bottom}, ::Type{Base.Bottom}) =
-    throw(ArgumentError("No promotion rule defined for storagetype `$T` and `$S`"))
+    throw(ArgumentError(lazy"No promotion rule defined for storagetype `$T` and `$S`"))
 
 # promotion rules for common vector types
 promote_storage_rule(::Type{T}, ::Type{S}) where {T <: DenseVector, S <: DenseVector} =
-    T === S ? T : throw(ArgumentError("No promotion rule defined for storagetype `$T` and `$S`"))
+    T === S ? T : throw(ArgumentError(lazy"No promotion rule defined for storagetype `$T` and `$S`"))
 
 # tensor characteristics: space and index information
 #-----------------------------------------------------
@@ -440,7 +440,7 @@ Base.@propagate_inbounds function subblock(t::AbstractTensorMap, sectors::Tuple{
     I === sectortype(t) || throw(SectorMismatch("Not a valid sectortype for this tensor."))
     FusionStyle(I) isa UniqueFusion ||
         throw(SectorMismatch("Indexing with sectors is only possible for unique fusion styles."))
-    length(sectors) == numind(t) || throw(ArgumentError("invalid number of sectors"))
+    length(sectors) == numind(t) || throw(ArgumentError(lazy"invalid number of sectors ($(length(sectors))) for number of indices ($(numind(t)))"))
 
     # convert to fusiontrees
     s₁ = TupleTools.getindices(sectors, codomainind(t))
diff --git a/src/tensors/braidingtensor.jl b/src/tensors/braidingtensor.jl
index a1b7dbd02..add0df48d 100644
--- a/src/tensors/braidingtensor.jl
+++ b/src/tensors/braidingtensor.jl
@@ -21,7 +21,7 @@ struct BraidingTensor{T, S, A <: DenseVector{T}} <: AbstractTensorMap{T, S, 2, 2
     function BraidingTensor{T, S, A}(V1::S, V2::S, adjoint::Bool = false) where {T, S <: IndexSpace, A <: DenseVector{T}}
         for a in sectors(V1), b in sectors(V2), c in (a ⊗ b)
             Nsymbol(a, b, c) == Nsymbol(b, a, c) ||
-                throw(ArgumentError("Cannot define a braiding between $a and $b"))
+                throw(ArgumentError(lazy"Cannot define a braiding between $a and $b"))
         end
         return new{T, S, A}(V1, V2, adjoint)
         # partial construction: only construct rowr and colr when needed
diff --git a/src/tensors/indexmanipulations.jl b/src/tensors/indexmanipulations.jl
index 7155bb4be..69f738a24 100644
--- a/src/tensors/indexmanipulations.jl
+++ b/src/tensors/indexmanipulations.jl
@@ -473,7 +473,7 @@ See also [`repartition!`](@ref) for writing into an existing destination.
         copy::Bool = false, backend = TO.DefaultBackend(), allocator = TO.DefaultAllocator()
     )
     N₁ + N₂ == numind(t) ||
-        throw(ArgumentError("Invalid repartition: $(numind(t)) to ($N₁, $N₂)"))
+        throw(ArgumentError(lazy"Invalid repartition: $(numind(t)) to ($N₁, $N₂)"))
     p₁, p₂ = let all_inds = (codomainind(t)..., reverse(domainind(t))...)
         ntuple(i -> all_inds[i], N₁), reverse(ntuple(i -> all_inds[i + N₁], N₂))
     end