A bathroom renovation is one of the most rewarding home improvements you can make, but getting the plumbing right is critical. Whether you’re updating a cramped Victorian terrace bathroom or modernising a 1960s estate property, understanding the plumbing side will save you time, money, and headaches.
First Fix vs Second Fix: What’s the Difference?
First fix plumbing happens before the walls are tiled or plastered. This includes:
- Running hot and cold water pipes to fixtures
- Installing waste pipes and connections
- Routing the soil pipe (toilet waste)
- Fitting shower valves behind the wall
- Running cables for electric showers or pumps
Second fix plumbing happens after tiling and decoration:
- Installing taps, showerheads, and exposed pipework
- Fitting toilets, basins, and baths
- Connecting everything to the first fix pipework
- Testing for leaks and commissioning
Most problems arise when homeowners or inexperienced tradespeople get the first fix wrong. Tiling over incorrectly positioned pipework means ripping it all out to fix mistakes.
Teesside Property Considerations
Different property types in our area have different challenges:
Victorian terraces: Small bathrooms, often upstairs conversions with limited space for soil stacks. You might need a macerator toilet if the bathroom is far from the main soil pipe. Original lead or iron pipework should be replaced during renovation.
1960s-70s estates: Better space, but pipework is 50+ years old. Check for corrosion. Many have low water pressure, which affects shower choice. Consider a power flush when updating radiators.
Modern builds: Usually straightforward, but check Building Regulations if you’re adding a new bathroom or moving the toilet position. Soil pipe routing needs to comply with fall and venting requirements.
Wetrooms and Walk-In Showers
Popular in Teesside renovations, but they need proper planning:
Tanking: Critical. The entire wetroom floor and walls (up to 1.8m) must be waterproofed. Use a proper tanking kit and let a professional fit it. Water damage from failed tanking is expensive.
Floor waste: Needs adequate fall (1:80 minimum) for drainage. Some Teesside properties have solid concrete floors where installing a floor waste means building up the floor height.
Shower pumps: Essential if you have low pressure (common in older properties). Twin-impeller pumps for shower and bath, single for shower only.
Waste Pipe Routing
This is where DIY renovations often fail:
- All waste pipes need a fall of 1:40 minimum (some fittings require 1:80)
- Avoid long horizontal runs without intermediate support
- Use swept bends, not sharp 90-degree elbows
- Connect basin, bath, and shower wastes to a single stack via proper boss connections
- Never connect waste pipes directly to the soil stack without an air admittance valve or proper venting
Small Teesside bathrooms often mean creative waste routing. Talk to your plumber early about positioning fixtures to minimise pipe runs.
Soil Stack Connections
Moving a toilet requires connecting to the soil stack (the large vertical pipe that handles toilet waste). Options:
Direct connection: Best option if the toilet is within 3 metres of the stack and has adequate fall.
Macerator toilet: Pumps waste through small-bore pipe when direct connection isn’t possible. Useful for attic conversions or distant bathrooms, but noisier and requires power.
New soil stack: Expensive but sometimes necessary when extending or converting spaces.
Common Mistakes to Avoid
Not discussing layout early: Plumbers need to know fixture positions before first fix. Changes after tiling are costly.
Choosing fixtures before checking pressure: That rainfall shower needs decent pressure. Test your water pressure first, or plan for a pump.
Ignoring Building Regulations: Moving toilets, adding bathrooms, or installing wetrooms often need Building Control sign-off. Your plumber should handle this, but ask upfront.
Skimping on access panels: You need access to concealed valves, pumps, and connections for future maintenance. Tiling over everything is a false economy.
Cheap materials: PVC waste pipes are fine, but use quality push-fit or soldered copper for supply pipes. Cheap push-fit fittings can fail.
Forgetting ventilation: New bathrooms need proper extraction to prevent mould. Background ventilation or a humidistat-controlled extractor fan.
Typical Costs and Timeline
Costs vary, but rough estimates for Teesside in 2026:
Small bathroom suite replacement (keeping layout the same): £2,500-£4,500 including labour, fixtures, tiling.
Full renovation with layout change: £5,000-£10,000 depending on complexity, fixtures, and structural work.
Wetroom conversion: £6,000-£12,000 including tanking, tiling, drainage, and shower fittings.
Timeline for a typical bathroom:
- First fix: 1-2 days
- Tiling and decoration: 3-5 days
- Second fix: 1 day
- Total: 1-2 weeks including drying time
What to Discuss with Your Plumber
Before starting:
- Water pressure: Test it. Low pressure affects fixture choice and might need a pump.
- Soil pipe location: Can the toilet connect easily, or do you need alternatives?
- Heating: Are you adding a towel radiator? Does it connect to central heating or electric?
- Electric shower: Needs a dedicated circuit from the consumer unit. Coordinate with your electrician.
- Access for maintenance: Where will concealed valves and pumps be accessed?
- Building Regulations: Who’s handling notification and sign-off?
- Timeline: When will first fix happen so other trades can coordinate?
The Bottom Line
Good bathroom plumbing starts with proper planning. Spend time getting the first fix right, choose fixtures that suit your water pressure, and don’t cut corners on waterproofing or materials.
If you’re renovating a bathroom in Middlesbrough, Stockton, or anywhere across Teesside, talk to us early in the process. We’ll help you plan the plumbing to avoid expensive mistakes.
Get a free quote or contact us to discuss your bathroom renovation.
Related services: Bathroom Plumbing | General Plumbing | Taps & Fixtures