The present chapel, completed in 1865, was designed by the architect William Ford Poulton (1822–1901) of Reading, Berkshire in a Lombard Romanesque Revival style.
It is built of stock brick with some red brick and stone dressings.
The façade on Buckingham Gate is gabled and has a recessed triple-arched central porch, with graduated arcading above, all having decorative shafting.
There is a tower to the right, with coupled arched windows.
The top stage of the tower was added in the 20th century in a different style and colour.

The auditorium, with seating capacity of about 1,500, is nearly oval, with two tiers of galleries and large open roof span.
The galleries too are nearly oval, except that the 'circle' of the upper gallery is incomplete so as to accommodate the pipe organ.
There is a high platform or daïs toward the front of the Chapel, accommodating the Communion Table and chairs for the presiding minister and the serving deacons.
This platform or daïs is about three feet above the floor level.
Beyond this is a large (and even higher) platform or daïs, forming a very large preaching-station or pulpit.
This feature is circular and surmounted by a balustrade.
It may perhaps be one of the largest pulpits in any church building.

The chapel is a Grade II Listed building.
The present chapel, completed in 1865, was designed by the architect William Ford Poulton (1822–1901) of Reading, Berkshire in a Lombard Romanesque Revival style. It is built of stock brick with some red brick and stone dressings. The façade on Buckingham Gate is gabled and has a recessed triple-arched central porch, with graduated arcading above, all having decorative shafting. There is a tower to the right, with coupled arched windows. The top stage of the tower was added in the 20th century in a different style and colour.
The auditorium, with seating capacity of about 1,500, is nearly oval, with two tiers of galleries and large open roof span. The galleries too are nearly oval, except that the 'circle' of the upper gallery is incomplete so as to accommodate the pipe organ. There is a high platform or daïs toward the front of the Chapel, accommodating the Communion Table and chairs for the presiding minister and the serving deacons. This platform or daïs is about three feet above the floor level. Beyond this is a large (and even higher) platform or daïs, forming a very large preaching-station or pulpit. This feature is circular and surmounted by a balustrade. It may perhaps be one of the largest pulpits in any church building.
The chapel is a Grade II Listed building.
Westminster Chapel