What do I need to think about before refurbishing an ensuite specifically?

An ensuite off a bedroom needs an extractor sized to the room's air changes per hour, not a generic unit picked because it was the one in stock. Building Regulations Part F sets minimum extract rates, and for a small ensuite this is often lower in absolute terms than a family bathroom but harder to achieve well because ducting runs are short and awkward.

Where the ensuite has no external wall, ducting has to run through the loft or a service void to an eave or soffit vent, and duct length and bends both reduce actual extract performance below the fan's rated figure. A humidity-sensing or timer-overrun fan is worth the small extra cost so it keeps clearing moisture after you leave the room.

Poor ventilation in an ensuite shows up as mould on the ceiling above the shower and on grout lines faster than in a larger room, simply because there is less air volume to dilute the moisture.

An ensuite shares at least one wall, and often the ceiling below, with a sleeping space. Waste pipes running through a stud wall next to a headboard, or a shower pump housed in an eaves cupboard next to the bed, can be genuinely disruptive at night.

Insulating stud wall cavities around soil and waste pipes with acoustic mineral wool, and isolating pipe clips with rubber grommets rather than fixing pipe to timber directly, reduces transmitted noise noticeably for a small additional cost during first-fix.

Extractor fan noise rating (measured in dB) varies a lot between models at similar price points; a fan rated around 20-25dB is barely noticeable next to a bedroom, where a cheaper 35dB+ unit can be intrusive at night.

WCs need a fall of around 18mm per metre on a 100mm soil pipe and a maximum practical run to the stack of roughly 6 metres before a mechanical macerator (a Saniflo-type unit) becomes the realistic option instead of gravity drainage.

Ensuites are frequently the room furthest from the existing soil stack, which is exactly when this limit gets tested. A survey checks the actual stack position and floor void depth before you commit to a layout with the WC on the far wall.

Shower waste needs a minimum fall too, typically achieved with a shower tray of at least 40mm upstand or a formed screed fall for a wet room-style tray, both of which need enough floor void depth to work, particularly on a solid concrete floor.

As a rule of thumb, anything under 2 m2 needs fittings chosen specifically for the space rather than adapted from a standard range, which is where a survey earns its keep before you fall in love with a suite that will not physically fit.

An ensuite refurbishment in our area typically runs from around £3,500 for a straightforward like-for-like swap to £8,500 or more where the layout changes, a macerator is needed, or the specification includes premium tiling and a bespoke shower enclosure. These figures are indicative planning ranges; the fixed price comes from a free survey once we have seen the room and the waste run.