Bathroom Renovations: Waterproofing, Ventilation and Layout Decisions

A bathroom renovation looks like a design project, but the success of the finished room is decided by what you cannot see. Waterproofing, falls to drains, ventilation and electrical safety all need to be right before tiles and sanitaryware are installed.

Layout and plumbing

Moving the toilet, bath or shower changes pipe runs and waste falls. In some homes the floor structure limits where waste can go, so it is wise to have the layout checked before you fall in love with a particular arrangement.

Waterproofing

• Wet areas such as shower enclosures need a proper waterproof layer behind the tiles

• Walk-in and wet room showers need correctly formed falls to the drain

• Junctions, corners and pipe penetrations are the most common points of failure

• Allow cure and drying times for each layer before moving on

Ventilation

Moisture is the enemy of any bathroom. An appropriately sized extractor fan, ducted to outside where possible, reduces condensation, mould and damage to finishes. Ventilation requirements are covered by the Building Regulations, so it is not an optional extra.

Electrics and lighting

Electrical equipment in a bathroom is subject to strict rules about where it can be installed in relation to water. Lighting, fans, heated mirrors and underfloor heating should all be planned with a qualified electrician.

Floors, heating and storage

• Check the floor is strong enough for a stone resin bath or heavy tiles

• Consider underfloor heating or heated towel rails at design stage

• Plan recessed niches and storage before the walls are boarded

Order fittings early

Taps, shower valves and sanitaryware need to be on site before second fix. Ordering early also lets the installer check dimensions against the plan.

See our kitchen and bathroom renovations for how we manage these projects.

Thinking about a project in London? Get in touch with Tota Design & Build to talk it through.