Separate defects from design preferences
Write down what is awkward about the room: a shower that is difficult to enter, a basin without landing space, storage that traps moisture or a door obstructing another fitting. Record staining, loose finishes and persistent dampness too, so their causes can be investigated before work is specified. Renewing the visible surface may leave an underlying defect untouched. Photographs taken during normal use can explain where water collects and which parts are difficult to clean. These observations help define the work more accurately than a list of replacement products.
Measure the door opening, the screen movement and the standing position beside each fitting. Test the arrangement with towels hanging and drawers extended. Where somebody has particular access needs, describe them at the outset. They should shape the design before a tightly packed collection of products becomes difficult to change.
Find the available drainage route
Locate the existing waste and soil connections and establish whether they serve only the home or form part of a shared installation. The route from each fitting can determine which layouts are practical. Examine the floor before committing to a flush shower threshold: its structure and available depth matter as much as the finish. The appropriate installer and designer should assess the proposed arrangement against measured conditions before concealed work begins. An attractive plan is of little use if the connections cannot be installed as shown.
In a flat, establish who authorises work affecting shared pipework and where inspection access must remain. In a house, check connections to the rooms above and below. Position service access deliberately rather than wherever a gap happens to remain. Photograph the installation before closing floors and boxing so that a future repair does not start with unnecessary opening up.
Detail the wet areas as a complete assembly
Identify the surfaces exposed to water and the junctions between different materials. Specify the chosen waterproofing system with compatible preparation, corners, penetrations and finishes, following the manufacturer's instructions. Tile and grout selection alone do not explain how a wet area will be protected. The installer needs to understand the wall construction and the treatment around pipes before finishing begins. Avoid combining products merely because each appears appropriate in isolation; the whole assembly should have a documented basis.
Show how the screen meets the floor and where its fixings sit in relation to concealed services. A toiletries recess needs an equally considered base and edge. Check whether a fitting can be replaced without unnecessarily disturbing the surrounding waterproofing. These decisions belong with the layout, not as decorative additions after the walls are complete. Review any proposed substitution against the complete detail before accepting it.
Give moisture an agreed route out
Review the existing fan, duct and outlet, including any connection to a shared system. Select equipment and controls with the installer and make provision for inspection and cleaning. A ventilation route should be understood before it is hidden above a new ceiling. Heating deserves similar attention: describe the intended comfort and towel-drying requirements and establish which system supplies the fitting. Choose the equipment after those matters are clear, rather than expecting a decorative rail to resolve every heating question.
The council maps separate conservation areas around Clerkenwell, including Clerkenwell Green and Charterhouse Square. Any proposed exterior outlet should be considered against the property's actual designation, rather than an assumed EC1-wide rule.
If work affects the external envelope or common services, obtain the appropriate instructions and resolve approval requirements before installation. Keep those decisions attached to the drawings that describe the proposed work.
Sources: Islington conservation areas
Select details that are easy to live with
Check the basin and tap together: spout reach, where splashes land, handle movement and the space between the fitting and a nearby wall. Consider cleaning behind the toilet, beneath a wall-mounted unit and along a screen edge. A small inaccessible gap may create more difficulty than a modest reduction in cabinet width. Review surface-care requirements when selecting materials, particularly if the room needs to withstand frequent use. Storage should keep everyday items convenient without obstructing ventilation or access to connections.
Agree a tile setting-out plan around windows, recesses and visible corners. Identify cut edges and explain how changes of material are finished. View samples under the proposed lighting and beside the mirror; reflections can make a texture more prominent than expected. Record the approved arrangement so that alignment decisions are not left to chance when fitting begins.
Inspect operation as well as appearance
Operate controls, move screens and open drawers together during the completion review. Check removable components and the route to maintainable equipment. Record model details for valves hidden behind surfaces, and collect the care instructions for finishes. Outstanding adjustments should be described by their exact location and required correction. Keep a clear account of which parts of the existing installation remain, particularly where new fittings connect to retained pipework. Future maintenance should not depend on guessing what was renewed.
The handover discussion is also the opportunity to explain ordinary operation. Confirm where isolation points are, how filters or removable covers are accessed and which cleaning methods the product makers recommend. A usable record supports the finished room long after the visible installation has been checked.
Before work begins
Bathroom renovation in Clerkenwell: questions
What should I check before adding a bathroom vent outside a Clerkenwell home?
Find the property on Islington's conservation map; Clerkenwell Green and Charterhouse Square are separate designations. Describe the proposed outlet and any existing opening before checking the permission route. The ventilation design should then coordinate that exterior detail with the fan and internal duct. A district postcode alone cannot establish whether the intended position is acceptable.
How should bathroom work approach a retained Clerkenwell house interior?
The Northampton Square assessment records surviving Georgian houses. If your bathroom sits within retained older rooms, identify the doors, wall finishes and floor construction before deciding what changes. Age alone does not establish a component's condition or permission to remove it. The bathroom design should show where new connections can run and which existing details are to stay visible and protected.
Can a bath or basin be retained?
A retained fitting can be included where its condition and connections allow continued use. Specify its protection and whether temporary removal is necessary. New finishes may meet it differently, so edges and levels need checking. Retention should remain compatible with cleaning, maintenance and the intended design rather than require an unresolved junction to be hidden at completion.
How are damp marks dealt with?
Their source needs investigation before the affected area is covered again. A connection, failed junction, ventilation problem or defect outside the room may be involved. Record unresolved findings and agree the next inspection. New paint or tiling should follow an appropriate repair; it should not be used as a substitute for explaining a persistent symptom.
What should I bring to a bathroom discussion?
Photographs, a plan or sketch and a description of the room's daily use are helpful. Include storage requirements and any accessibility considerations. Add known information about shared services and management conditions. Product preferences can guide the design, but the available space and installation routes should be understood before important fittings are ordered.
Official sources
Islington conservation areas · Northampton Square conservation design guidelines
Checked 4 November 2026. Maps, list entries and directions must be checked for the individual property and proposed work.