diff --git a/crates/polars-arrow/src/bitmap/builder.rs b/crates/polars-arrow/src/bitmap/builder.rs
index a4639e30adac..a8aa933fb1c3 100644
--- a/crates/polars-arrow/src/bitmap/builder.rs
+++ b/crates/polars-arrow/src/bitmap/builder.rs
@@ -24,6 +24,11 @@ impl BitmapBuilder {
         self.bit_len
     }
 
+    #[inline(always)]
+    pub fn is_empty(&self) -> bool {
+        self.bit_len == 0
+    }
+
     #[inline(always)]
     pub fn capacity(&self) -> usize {
         self.bit_cap
diff --git a/crates/polars-core/src/chunked_array/object/builder.rs b/crates/polars-core/src/chunked_array/object/builder.rs
index ca418a0ac92d..b6992aa591a2 100644
--- a/crates/polars-core/src/chunked_array/object/builder.rs
+++ b/crates/polars-core/src/chunked_array/object/builder.rs
@@ -145,13 +145,17 @@ where
         unsafe { ObjectChunked::new_with_dims(field, vec![arr], len, 0) }
     }
 
-    pub fn new_from_vec_and_validity(name: PlSmallStr, v: Vec<T>, validity: Bitmap) -> Self {
+    pub fn new_from_vec_and_validity(
+        name: PlSmallStr,
+        v: Vec<T>,
+        validity: Option<Bitmap>,
+    ) -> Self {
         let field = Arc::new(Field::new(name, DataType::Object(T::type_name(), None)));
         let len = v.len();
-        let null_count = validity.unset_bits();
+        let null_count = validity.as_ref().map(|v| v.unset_bits()).unwrap_or(0);
         let arr = Box::new(ObjectArray {
             values: v.into(),
-            validity: Some(validity),
+            validity,
         });
 
         unsafe { ObjectChunked::new_with_dims(field, vec![arr], len, null_count) }
diff --git a/crates/polars-plan/src/dsl/function_expr/shift_and_fill.rs b/crates/polars-plan/src/dsl/function_expr/shift_and_fill.rs
index d0d27742ed54..3230e96a98d1 100644
--- a/crates/polars-plan/src/dsl/function_expr/shift_and_fill.rs
+++ b/crates/polars-plan/src/dsl/function_expr/shift_and_fill.rs
@@ -17,24 +17,24 @@ where
     feature = "dtype-categorical"
 ))]
 fn shift_and_fill_with_mask(s: &Column, n: i64, fill_value: &Column) -> PolarsResult<Column> {
-    use polars_core::export::arrow::array::BooleanArray;
-    use polars_core::export::arrow::bitmap::MutableBitmap;
+    use arrow::array::BooleanArray;
+    use arrow::bitmap::BitmapBuilder;
 
     let mask: BooleanChunked = if n > 0 {
         let len = s.len();
-        let mut bits = MutableBitmap::with_capacity(s.len());
+        let mut bits = BitmapBuilder::with_capacity(s.len());
         bits.extend_constant(n as usize, false);
         bits.extend_constant(len.saturating_sub(n as usize), true);
-        let mask = BooleanArray::from_data_default(bits.into(), None);
+        let mask = BooleanArray::from_data_default(bits.freeze(), None);
         mask.into()
     } else {
         let length = s.len() as i64;
         // n is negative, so subtraction.
         let tipping_point = std::cmp::max(length + n, 0);
-        let mut bits = MutableBitmap::with_capacity(s.len());
+        let mut bits = BitmapBuilder::with_capacity(s.len());
         bits.extend_constant(tipping_point as usize, true);
         bits.extend_constant(-n as usize, false);
-        let mask = BooleanArray::from_data_default(bits.into(), None);
+        let mask = BooleanArray::from_data_default(bits.freeze(), None);
         mask.into()
     };
     s.shift(n).zip_with_same_type(&mask, fill_value)
diff --git a/crates/polars-python/src/series/construction.rs b/crates/polars-python/src/series/construction.rs
index a15773a21e3f..91cc012fec1f 100644
--- a/crates/polars-python/src/series/construction.rs
+++ b/crates/polars-python/src/series/construction.rs
@@ -3,7 +3,7 @@ use std::borrow::Cow;
 use numpy::{Element, PyArray1, PyArrayMethods};
 use polars::export::arrow;
 use polars::export::arrow::array::Array;
-use polars::export::arrow::bitmap::MutableBitmap;
+use polars::export::arrow::bitmap::BitmapBuilder;
 use polars::export::arrow::types::NativeType;
 use polars_core::prelude::*;
 use polars_core::utils::CustomIterTools;
@@ -294,7 +294,7 @@ impl PySeries {
     pub fn new_object(py: Python, name: &str, values: Vec<ObjectValue>, _strict: bool) -> Self {
         #[cfg(feature = "object")]
         {
-            let mut validity = MutableBitmap::with_capacity(values.len());
+            let mut validity = BitmapBuilder::with_capacity(values.len());
             values.iter().for_each(|v| {
                 let is_valid = !v.inner.is_none(py);
                 // SAFETY: we can ensure that validity has correct capacity.
@@ -304,7 +304,7 @@ impl PySeries {
             let ca = ObjectChunked::<ObjectValue>::new_from_vec_and_validity(
                 name.into(),
                 values,
-                validity.into(),
+                validity.into_opt_validity(),
             );
             let s = ca.into_series();
             s.into()
diff --git a/crates/polars-row/src/decode.rs b/crates/polars-row/src/decode.rs
index 3e7cf79be06d..0a5e862798b5 100644
--- a/crates/polars-row/src/decode.rs
+++ b/crates/polars-row/src/decode.rs
@@ -1,4 +1,4 @@
-use arrow::bitmap::{Bitmap, MutableBitmap};
+use arrow::bitmap::{Bitmap, BitmapBuilder};
 use arrow::buffer::Buffer;
 use arrow::datatypes::ArrowDataType;
 use arrow::offset::OffsetsBuffer;
@@ -62,16 +62,16 @@ unsafe fn decode_validity(rows: &mut [&[u8]], opt: RowEncodingOptions) -> Option
     // No nulls just return None
     let first_null = first_null?;
 
-    let mut bm = MutableBitmap::new();
+    let mut bm = BitmapBuilder::new();
     bm.reserve(rows.len());
     bm.extend_constant(first_null, true);
     bm.push(false);
-    bm.extend_from_trusted_len_iter(rows[first_null + 1..].iter_mut().map(|row| {
+    bm.extend_trusted_len_iter(rows[first_null + 1..].iter_mut().map(|row| {
         let v;
         (v, *row) = row.split_at_unchecked(1);
         v[0] != null_sentinel
     }));
-    Some(bm.freeze())
+    bm.into_opt_validity()
 }
 
 // We inline this in an attempt to avoid the dispatch cost.
@@ -240,7 +240,7 @@ unsafe fn decode(
             FixedSizeListArray::new(dtype.clone(), rows.len(), values, validity).to_boxed()
         },
         D::List(list_field) | D::LargeList(list_field) => {
-            let mut validity = MutableBitmap::new();
+            let mut validity = BitmapBuilder::new();
 
             // @TODO: we could consider making this into a scratchpad
             let num_rows = rows.len();
@@ -281,7 +281,7 @@ unsafe fn decode(
                 None
             } else {
                 validity.extend_constant(num_rows - validity.len(), true);
-                Some(validity.freeze())
+                validity.into_opt_validity()
             };
             assert_eq!(offsets.len(), rows.len() + 1);
 
diff --git a/crates/polars-row/src/fixed/decimal.rs b/crates/polars-row/src/fixed/decimal.rs
index b77e91e8df7b..589b3e64ad05 100644
--- a/crates/polars-row/src/fixed/decimal.rs
+++ b/crates/polars-row/src/fixed/decimal.rs
@@ -6,7 +6,7 @@
 use std::mem::MaybeUninit;
 
 use arrow::array::{Array, PrimitiveArray};
-use arrow::bitmap::MutableBitmap;
+use arrow::bitmap::BitmapBuilder;
 use arrow::datatypes::ArrowDataType;
 use polars_utils::slice::Slice2Uninit;
 
@@ -205,7 +205,7 @@ pub unsafe fn decode(
         return PrimitiveArray::new(ArrowDataType::Int128, values.into(), None);
     }
 
-    let mut validity = MutableBitmap::with_capacity(rows.len());
+    let mut validity = BitmapBuilder::with_capacity(rows.len());
     validity.extend_constant(values.len(), true);
 
     let start_len = values.len();
@@ -238,6 +238,6 @@ pub unsafe fn decode(
     PrimitiveArray::new(
         ArrowDataType::Int128,
         values.into(),
-        Some(validity.freeze()),
+        validity.into_opt_validity(),
     )
 }
diff --git a/crates/polars-row/src/fixed/packed_u32.rs b/crates/polars-row/src/fixed/packed_u32.rs
index ac252d4376a3..41b6fb550e3e 100644
--- a/crates/polars-row/src/fixed/packed_u32.rs
+++ b/crates/polars-row/src/fixed/packed_u32.rs
@@ -6,7 +6,7 @@
 use std::mem::MaybeUninit;
 
 use arrow::array::{Array, PrimitiveArray};
-use arrow::bitmap::MutableBitmap;
+use arrow::bitmap::BitmapBuilder;
 use arrow::datatypes::ArrowDataType;
 use polars_utils::slice::Slice2Uninit;
 
@@ -154,7 +154,7 @@ pub unsafe fn decode(
         return PrimitiveArray::new(ArrowDataType::UInt32, values.into(), None);
     }
 
-    let mut validity = MutableBitmap::with_capacity(rows.len());
+    let mut validity = BitmapBuilder::with_capacity(rows.len());
     validity.extend_constant(values.len(), true);
 
     let start_len = values.len();
@@ -175,6 +175,6 @@ pub unsafe fn decode(
     PrimitiveArray::new(
         ArrowDataType::UInt32,
         values.into(),
-        Some(validity.freeze()),
+        validity.into_opt_validity(),
     )
 }
diff --git a/crates/polars-row/src/utils.rs b/crates/polars-row/src/utils.rs
index 5b5259b2847c..2f46fbff5105 100644
--- a/crates/polars-row/src/utils.rs
+++ b/crates/polars-row/src/utils.rs
@@ -1,4 +1,4 @@
-use arrow::bitmap::{Bitmap, MutableBitmap};
+use arrow::bitmap::{Bitmap, BitmapBuilder};
 
 #[macro_export]
 macro_rules! with_match_arrow_primitive_type {(
@@ -27,15 +27,15 @@ pub(crate) unsafe fn decode_opt_nulls(rows: &[&[u8]], null_sentinel: u8) -> Opti
         .iter()
         .position(|row| *row.get_unchecked(0) == null_sentinel)?;
 
-    let mut bm = MutableBitmap::with_capacity(rows.len());
+    let mut bm = BitmapBuilder::with_capacity(rows.len());
     bm.extend_constant(first_null, true);
     bm.push(false);
 
-    bm.extend_from_trusted_len_iter_unchecked(
+    bm.extend_trusted_len_iter(
         rows[first_null + 1..]
             .iter()
             .map(|row| *row.get_unchecked(0) != null_sentinel),
     );
 
-    Some(bm.freeze())
+    bm.into_opt_validity()
 }
diff --git a/crates/polars-row/src/variable/no_order.rs b/crates/polars-row/src/variable/no_order.rs
index 0619125af714..cba0c4f328ec 100644
--- a/crates/polars-row/src/variable/no_order.rs
+++ b/crates/polars-row/src/variable/no_order.rs
@@ -11,7 +11,7 @@
 use std::mem::MaybeUninit;
 
 use arrow::array::{BinaryViewArray, MutableBinaryViewArray};
-use arrow::bitmap::MutableBitmap;
+use arrow::bitmap::BitmapBuilder;
 use polars_utils::slice::Slice2Uninit;
 
 use crate::row::RowEncodingOptions;
@@ -90,7 +90,7 @@ pub unsafe fn decode_variable_no_order(
 
     let num_rows = rows.len();
     let mut array = MutableBinaryViewArray::<[u8]>::with_capacity(num_rows);
-    let mut validity = MutableBitmap::new();
+    let mut validity = BitmapBuilder::new();
 
     for row in rows.iter_mut() {
         let sentinel = *unsafe { row.get_unchecked(0) };
@@ -142,5 +142,5 @@ pub unsafe fn decode_variable_no_order(
     }
 
     let array = array.freeze();
-    array.with_validity(Some(validity.freeze()))
+    array.with_validity(validity.into_opt_validity())
 }
diff --git a/crates/polars-row/src/variable/utf8.rs b/crates/polars-row/src/variable/utf8.rs
index 6d0b473ad47a..68a4f3df5c2d 100644
--- a/crates/polars-row/src/variable/utf8.rs
+++ b/crates/polars-row/src/variable/utf8.rs
@@ -10,7 +10,7 @@
 use std::mem::MaybeUninit;
 
 use arrow::array::{MutableBinaryViewArray, Utf8ViewArray};
-use arrow::bitmap::MutableBitmap;
+use arrow::bitmap::BitmapBuilder;
 
 use crate::row::RowEncodingOptions;
 
@@ -98,7 +98,7 @@ pub unsafe fn decode_str(rows: &mut [&[u8]], opt: RowEncodingOptions) -> Utf8Vie
         return array.into();
     }
 
-    let mut validity = MutableBitmap::with_capacity(num_rows);
+    let mut validity = BitmapBuilder::with_capacity(num_rows);
     validity.extend_constant(array.len(), true);
     validity.push(false);
     array.push_value_ignore_validity("");
@@ -124,5 +124,5 @@ pub unsafe fn decode_str(rows: &mut [&[u8]], opt: RowEncodingOptions) -> Utf8Vie
     }
 
     let out: Utf8ViewArray = array.into();
-    out.with_validity(Some(validity.freeze()))
+    out.with_validity(validity.into_opt_validity())
 }
diff --git a/crates/polars-stream/src/nodes/io_sources/parquet/row_group_decode.rs b/crates/polars-stream/src/nodes/io_sources/parquet/row_group_decode.rs
index 8e4ddce836a1..978a2c5b2307 100644
--- a/crates/polars-stream/src/nodes/io_sources/parquet/row_group_decode.rs
+++ b/crates/polars-stream/src/nodes/io_sources/parquet/row_group_decode.rs
@@ -6,7 +6,7 @@ use polars_core::prelude::{
 };
 use polars_core::scalar::Scalar;
 use polars_core::series::{IsSorted, Series};
-use polars_core::utils::arrow::bitmap::{Bitmap, MutableBitmap};
+use polars_core::utils::arrow::bitmap::{Bitmap, BitmapBuilder};
 use polars_error::{polars_bail, PolarsResult};
 use polars_io::hive;
 use polars_io::predicates::PhysicalIoExpr;
@@ -587,7 +587,7 @@ impl RowGroupDecoder {
         }
 
         let mask_bitmap = {
-            let mut mask_bitmap = MutableBitmap::with_capacity(mask.len());
+            let mut mask_bitmap = BitmapBuilder::with_capacity(mask.len());
 
             for chunk in mask.downcast_iter() {
                 match chunk.validity() {