Planning a Bathroom Renovation? Here's What You Need to Know

A well-designed bathroom can transform the feel of an entire home. It's one of the rooms we use every single day, and yet it's often the last to be updated. If you're thinking about a bathroom renovation — whether it's a full strip-out and redesign or a targeted refresh — the difference between a project that runs smoothly and one that becomes a nightmare usually comes down to planning.

At Prime Degrees, we've completed hundreds of bathroom installations across Hertfordshire and Essex. Here's what we've learned about what makes a bathroom project go well — and the mistakes that are easiest to avoid.

Start With a Clear Brief

Before you look at a single tile or tap, get clear on what you actually want. Are you after a complete redesign with a new layout, or do you want to keep the existing footprint and simply update the fixtures and finishes? Do you want a bath, a shower, or both? Is storage a priority? What's your budget — and what's your absolute maximum? The more clearly you can articulate what you want, the easier it is for your installer to give you an accurate quote and a realistic timeline.

Understand What's Involved in a Full Renovation

A full bathroom renovation typically involves stripping out all existing fixtures, tiles, and flooring; any necessary changes to the plumbing layout; installation of new sanitary ware (bath, basin, toilet, shower); tiling walls and floor; fitting new lighting and ventilation; and decorating. Depending on the size of the room and the complexity of the work, this typically takes between eight and fifteen working days. During that time, you'll be without a functioning bathroom — so if you only have one bathroom in the house, it's worth planning for this in advance.

Set a Realistic Budget

Bathroom renovations vary enormously in cost depending on the size of the room, the quality of the fixtures and tiles chosen, and the complexity of the plumbing work. As a rough guide, a mid-range full bathroom renovation in the Hertfordshire area typically costs between £8,000 and £15,000 including VAT for labour and materials combined. High-end projects with premium sanitary ware and bespoke tiling can run considerably higher. It's always worth getting two or three detailed, itemised quotes — and being wary of quotes that seem unusually low, as these often don't include everything.

Choose Your Fixtures and Tiles Before Work Starts

One of the most common causes of delays on bathroom projects is fixtures and tiles not being on site when needed. Lead times for some sanitary ware and tiles can be four to eight weeks, and if your chosen bath or basin is out of stock, it can hold up the entire project. Ideally, have everything ordered and delivered before your start date. Your installer can advise on what needs to be on site at which stage of the project.

Don't Underestimate the Importance of Ventilation

Poor ventilation is the number one cause of mould and damp in bathrooms. Building regulations require adequate mechanical ventilation in any bathroom without an openable window — and even in bathrooms that do have windows, a good extractor fan is essential. When planning your renovation, make sure your installer includes a quality extractor fan with a humidistat (which automatically activates when moisture levels rise) as standard. It's a small cost that makes a significant difference to the longevity of your bathroom.

Think About Waterproofing

Proper waterproofing behind tiles — particularly in the shower area — is non-negotiable. This is an area where cutting corners has serious long-term consequences: water ingress behind tiles can cause structural damage, mould, and the need to redo the entire bathroom within a few years. Ask your installer about the waterproofing system they use and make sure it's applied before any tiling begins.

Use a Qualified, Registered Installer

Any plumbing work in a bathroom must be carried out by a qualified plumber. Gas work — if you're moving or adding a heated towel rail connected to the central heating system, for example — must be carried out by a Gas Safe registered engineer. Always ask to see your installer's qualifications and check their registration on the relevant official registers. At Prime Degrees, all our engineers are fully qualified and Gas Safe registered where applicable.

Plan for the Unexpected

Even the best-planned bathroom projects can encounter surprises once the walls and floors are opened up — old pipework that needs replacing, unexpected damp, or subfloor issues that need addressing. Building in a contingency of around 10–15% of your total budget is sensible, and choosing an installer who communicates clearly when issues arise (rather than just pressing ahead and adding to the bill) is essential.