On-site Design Survey: a complete guide for Kent homeowners

What is an on-site design survey?

An on-site design survey is the foundation of a successful bathroom project. It’s a measured, technical visit where a bathroom specialist inspects your space, records levels and pipe runs, assesses structural and services constraints, and produces accurate CAD drawings or plans to use for installation and planning.

For Kent homeowners — whether a Victorian terrace in Canterbury, a new build in Ashford or a bungalow outside Maidstone — a proper survey removes guesswork and prevents expensive surprises on site.

Why you need one

• Accurate measurements reduce waste and delays when tiling, wet-room tanking or installing bespoke joinery.
• Early identification of structural or drainage issues prevents mid-job redesigns.
• Professional sketches and CAD drawings form part of planning applications, building-regs submissions and warranty records.

TBE Bathrooms offers on-site surveys with CAD output, backed by 27 years’ experience and industry approvals (CIPHE, Approved WaterRegs, Gas Safe, OFTEC, Trusted Trader, Checkatrade, County Council Trader Standard Approved).

What the survey covers — a tradesperson’s checklist

The survey goes beyond a tape measure. Expect the surveyor to record:

• Floor-to-ceiling heights, finished floor levels and step offsets
• Position and sizes of soil stacks, soil bends, waste and cold-water feeds
• Boiler/immersion positions, existing radiators, underfloor heating runs
• Access for installers and waste removal (narrow corridors, stair turns)
• Wall construction (solid brick, stud, party wall, timber frame) and fixing options
• Existing electrics: fuseboard location, circuit types, and proposed new loads (dehumidifiers, heated towel rails)
• Ventilation: mechanical extract requirements and routes for ducting
• Drainage fall and manhole locations, proximity to soakaways or mains sewer
• Any conservation area or listed-building constraints affecting ventilation, windows or external vents
• Tiling substrate condition, floor joist spans and loadbearing concerns for baths or showers

This detail feeds directly into CAD drawings and a realistic programme of work.

How to prepare your home for the survey

A little prep saves time and sharpens the quote. Before the survey:

• Clear the bathroom of personal items and unlock cupboards so pipework and services can be checked.
• Make available loft hatch access and a key to any external meter cupboards if relevant.
• Note any known symptoms (low pressure, slow drains, foul odour) and when they occur.
• Prepare a brief: preferred shower type, bath size, tile choice, accessibility needs and any brand or product preferences.

If you have existing drawings or previous planning consents, have those to hand — they can speed up the on-site assessment.

Practical issues we see across Kent properties

• Period properties in Canterbury and Maidstone often have non-standard waste runs, concealed vents or timber floors that need tanking and new joist supports for modern baths.
• Newer estates in Ashford may have plumbed-in combi boilers with limited hot-water throughput that affect shower choices.
• Coastal and rural properties can have hard water scale or septic tanks requiring specific water-softening or waste-routing solutions.
• Conservation areas restrict external vents, so mechanical extract or acoustic ducts must be planned early.

A competent survey will flag these and propose technical options rather than surprises on day one of works.

Deliverables you should expect

A professional on-site design survey typically produces:

• Dimensioned CAD drawings or plan elevations showing sanitaryware positions, service routes and access panels
• A scope of works and a written specification for trades (tilers, plasterers, electricians) and materials
• A list of recommended products and brand alternatives based on installation constraints
• Identified compliance notes (WaterRegs, building regulations, electrical zones)

These deliverables reduce ambiguity and give you a realistic schedule and procurement list.

How a survey affects project cost (not prices)

Several survey findings influence cost drivers: the need for structural work (joist reinforcement), relocating soil stacks, installing mechanical ventilation, renewing screed or tanking for wet rooms, and access complexities. Clear drawings minimise contingency and speed installation, so the survey is an investment that reduces risk.

Choosing the right surveyor

Pick a contractor who:

• Produces CAD-ready drawings on site
• Holds relevant accreditations (we hold CIPHE, Approved WaterRegs, Gas Safe, OFTEC and local trading approvals)
• Can manage the project from design through to handover — especially important for turnkey installations
• Provides a clear written scope and compliance notes after the visit

Ready to book a survey?

If you’re in Kent, Ashford, Maidstone or Canterbury and planning a bathroom refit or bespoke project, book an on-site design survey with a specialist who understands local building types and regulations. TBE Bathrooms offers on-site CAD surveys, full turnkey delivery and 27 years’ experience delivering bespoke bathrooms across Kent. Email info@tbebathrooms to arrange a survey or to ask about our CAD drawings and project management service.