The front door of No. 21 opens into the hallway, with Bedroom Three/Snug on the right-hand side. The hallway is fitted with oak flooring, which continues through to the inner hallway. There is a utility cupboard with space and plumbing for a washing machine and tumble dryer, and an understairs storage cupboard, and a cloakroom/shower room comprising a low-level WC, pedestal wash hand basin, and shower cubicle. The inner hallway then leads through to the open-plan kitchen/sitting/dining room. The kitchen is fitted with a range of worktops with solid wood surfaces, space for a fridge and freezer, an integrated dishwasher, and space for a range-style cooker. The sitting/dining area features bi-fold doors opening onto the south-facing patio garden, with steps leading up to the raised lawn.

On the first floor are two double bedrooms, with Bedroom One benefiting from built-in wardrobes and an en-suite bathroom comprising a bath, low-level WC, bidet, shower cubicle, and vanity unit. There is also access to the loft.

The garden faces due south and comprises a full width patio with steps leading up to level grass and is planted with a variety of small shrubs and trees. There is a garden shed and at the end a gate providing access to a passageway leading onto Gosport Street.