What’s Included in a Professional Bathroom Installation?

Most homeowners planning a new bathroom focus on the fixtures: the bath, the shower, the tiles. These choices matter — but they represent only part of what a professional bathroom installation actually involves. Labour consistently accounts for 45–60% of the total cost of a bathroom renovation in the UK. Understanding what that labour covers, who does each part of the job, and which elements require legally certified professionals is what separates a homeowner who gets a fair price from one who gets an incomplete job.

This guide walks through the full scope of a professional bathroom installation from start to finish: the twelve stages of work, who is responsible for each, the regulatory requirements that apply, and what a complete installation should cost in Birmingham in 2026.

Why Professional Installation Matters

A bathroom combines three of the most technically regulated trades in UK construction: plumbing, gas work, and electrics. Water and electricity share the same space. Gas connections may serve a heated towel rail or a gas boiler serving the hot water. Waterproofing failures behind tiles cause structural damp that is invisible for months and expensive to remedy.

A professional installation means qualified and registered trades handling each element. It means certificates that protect you legally and are required for home insurance purposes. It means a job that a future buyer’s solicitor can accept as compliant. And it means that when something needs repairing in five years, the trades involved can return to a job they understand.

The Twelve Stages of a Bathroom Installation

A complete bathroom installation follows a logical sequence. Each stage depends on the previous one being complete. The table below maps every stage, who carries it out, and what it involves.

 

Stage	What’s Involved	Who Does It	Notes
1	Strip-out: removal of existing suite, tiles, flooring	Bathroom fitter	Includes disconnecting existing plumbing and capping supply pipes. Waste goes to skip or van. Cost: £400–£700 labour.

 

Stage	What’s Involved	Who Does It	Notes
2	First fix plumbing: supply and waste pipe positioning	Plumber (Gas Safe if gas work involved)	Pipes re-routed or extended to suit new layout. If layout stays the same, this stage is minimal. Layout changes add significant cost.
3	First fix electrics: wiring for lighting, extractor fan, shaver socket, underfloor heating	Part P registered electrician	All bathroom electrical work must be Part P certified or notified to Building Control. Not optional. An uncertified bathroom electrical installation is a legal liability.
4	Boarding and waterproofing: tile backer boards, tanking, wet area preparation	Bathroom fitter / tiler	Wet areas behind the bath, shower, and basin must be waterproofed before tiling. Missing this step is the most common cause of long-term damp and mould in bathroom renovations.
5	Floor preparation: levelling, membrane, substrate	Bathroom fitter / tiler	An uneven floor causes cracked tiles and grout failure. Levelling compound is standard on most UK bathroom floors. Heated flooring elements installed at this stage.
6	Suite installation: bath, shower enclosure, toilet, basin, vanity unit	Bathroom fitter / plumber	Wall-hung toilets and basins require concealed frames (e.g. Geberit) fixed to the wall at this stage. Freestanding baths need the waste fitted before the bath is positioned.
7	Second fix plumbing: connecting taps, shower, toilet, heated towel rail	Plumber (Gas Safe if gas towel rail)	Heated towel rails connected to the central heating circuit require a Gas Safe engineer to commission. Electric towel rails require Part P electrician sign-off.
8	Tiling: walls and floor	Tiler	The longest phase in most bathroom projects. Full height tiling on a medium bathroom (3m x 2m) typically takes 3–5 days. Large-format tiles take longer.
9	Second fix electrics: fitting lights, extractor, sockets, thermostat	Part P registered electrician	Must be completed after tiling. An Electrical Installation Certificate (EIC) is issued for all notifiable bathroom electrical work.
10	Flooring: porcelain tiles, vinyl, SPC, or wet room resin	Tiler / bathroom fitter	Porcelain tile floors are standard in most mid-range installations. Vinyl or SPC flooring is faster to fit and increasingly popular in budget-sensitive projects.
11	Finishing: silicone sealing, accessories, mirrors, towel rails	Bathroom fitter	Silicone joints at all junctions (bath/tiles, basin/wall) require neat, clean application. Poorly applied silicone is the most visible sign of a rushed job.

 

Stage	What’s Involved	Who Does It	Notes
12	Sign-off: certificates, testing, handover	All relevant trades	Plumbing tested for leaks. EIC issued for electrics. Building Regulations notification filed if applicable. All documentation provided to homeowner.

 

What the Law Requires: Certified Professionals for Specific Work

Not every part of a bathroom installation requires a formal certification. But two elements do — and corners cut here create legal liability, insurance problems, and genuine safety risk.

Electrical work: Part P Building Regulations

All electrical work in a bathroom is a notifiable activity under Part P of the Building Regulations (England). This means either a Part P registered electrician carries out the work and issues an Electrical Installation Certificate (EIC), or the work is notified to your local Building Control and inspected before sign-off.

Bathroom electrical work that requires Part P compliance includes: new lighting circuits, extractor fans, shaver sockets, electric underfloor heating, electric towel rails, and any modification of existing circuits within the bathroom zones. A bathroom fitted with uncertified electrical work cannot be legally sold without retrospective regularisation — a process that is significantly more expensive and disruptive than doing it correctly the first time.

Gas work: Gas Safe Register

Any gas connection in a bathroom — most commonly a heated towel rail connected to the central heating system, or a boiler serving the hot water — must be installed and commissioned by a Gas Safe registered engineer. GSHSB engineers are Gas Safe registered and handle the gas and plumbing elements of bathroom installations across Birmingham. Gas work carried out by an unregistered person is illegal and voids building insurance.

Plumbing: no formal certification required, but competence matters

There is no formal licensing requirement for domestic plumbing work in England. However, a competent plumber who understands pipe sizing, fall gradients for waste, and water supply regulations is essential. Poor waste pipe gradients cause persistent slow drainage. Undersized supply pipes cause pressure problems. The absence of a formal licence makes the trade’s qualifications and experience references more important, not less.

“The most common problem we see in bathroom installations that have gone wrong is missing waterproofing behind tiles, and uncertified electrical work that comes to light when the homeowner tries to sell. Both are completely avoidable with the right trades from the start.”

What Your Quote Should Include: A Checklist

A professional bathroom installation quote should be itemised and specific. If a quote is a single number without a breakdown, ask for the detail before signing. The following should all be explicitly confirmed in writing:

• Strip-out and waste removal — is this included, or charged separately? Strip-out is £400–£700 in labour and skip hire adds £200–£400.
• All plumbing connections — first fix (pipe rerouting) and second fix (connecting fixtures) both
• Electrical work — is a Part P registered electrician used, and is the EIC (Electrical Installation Certificate) included in the price?
• Waterproofing / tanking — wet area preparation behind the shower, bath, and basin should be explicitly included.
• Tiling labour — is wall tiling and floor tiling included? At what size and how many m²?
• Materials — are the fixtures (bath, toilet, basin, shower) in the quote price or supplied separately by you?
• Grouting and siliconing — final finishing work should be included, not an
• Gas Safe certification — if a heated towel rail is connecting to the central heating, confirm a Gas Safe engineer carries out and certifies this.
• Building Regulations notification — if layout changes require Building Control notification, who handles this and at what cost?

What Does a Professional Bathroom Installation Cost in Birmingham?

Prices across Birmingham in 2026 have stabilised after several years of material cost volatility. The ranges below are based on current market rates across the West Midlands and align with data from M3 Trades’ June 2026 Birmingham price survey and the UK Bathroom Market Report 2024 average spend of £6,500 per full renovation.

 

Specification	Typical Cost (Birmingham 2026)	What’s Included
Essential Like-for-like replacement	£4,500 – £7,500	Existing layout retained. Quality mid-range suite. Full tiling. All plumbing and electrical work. Strip-out and waste removal included.
Mid-Range Layout change or upgrade	£7,500 – £12,000	Walk-in shower, premium brassware, large-format tiles, vanity unit. May include layout adjustments, new soil stack connection, underfloor heating.
Luxury / Master Ensuite	£12,000 – £20,000+	Bespoke design, frameless glass, feature tile walls, underfloor heating, freestanding bath, designer fixtures. Full project management.

All prices are Birmingham and West Midlands market rates for 2026 and include labour, plumbing, electrics, and installation. Fixtures and tiles are included in the GSHSB supply-and-fit service or can be customer-supplied. Prices vary based on room size, access, and specification. Always request a fixed-price itemised quotation before work begins.

How to Reduce Costs Without Compromising the Installation

The most effective cost-saving decisions are made at the planning stage, not the purchasing stage. Downgrading fixtures saves less than most homeowners expect; structural decisions save significantly more.

• Keep the existing Retaining the toilet, bath, and basin in their current positions eliminates most of the first-fix plumbing work and can reduce costs by up to 35%. Moving a toilet to the opposite wall in a Birmingham terrace can add £800–£1,500 in soil stack extension work alone.
• Choose standard tile 300×600mm wall tiles and 600×600mm floor tiles are faster to lay than large-format or metro tiles. Fewer cuts, less waste, lower labour cost.
• Consider wall panels over full-height Laminate or acrylic bathroom panels are faster to install than tiling and can halve the wall covering labour cost while still looking clean and professional.
• Use close-coupled or back-to-wall Wall-hung toilets require a concealed cistern frame fixed to the wall and are significantly more expensive to install than close-coupled alternatives.
• Supply your own fixtures. If you source the suite yourself from a bathroom retailer (Victorian Plumbing, Drench, Screwfix), a good installer will fit your chosen products at the labour rate This can save £500–£1,500 versus a full supply-and-fit package.

How Long Does a Bathroom Installation Take?

A standard like-for-like bathroom replacement in a Birmingham property with no layout changes typically takes 5–7 working days for a professional team. Here is a realistic day-by-day breakdown:

• Day 1: Strip-out, waste removal, first-fix plumbing and electrical wiring
• Days 2–3: Boarding, waterproofing, floor preparation, suite installation
• Days 3–5: Tiling (wall and floor) — the longest phase in most projects
• Days 5–6: Second-fix plumbing and electrics, flooring, accessories
• Day 7: Grouting, siliconing, final fixes, testing, certificates, handover

 

Projects with layout changes, structural work, or large-format tiling extend this timeline. A luxury master ensuite with bespoke elements can take 10–14 working days. Your installer should provide a realistic timeline in writing before work begins, particularly if you are sharing one bathroom between the household during the renovation.

“We’d had quotes ranging from £5,800 to £9,200 for the same bathroom in Erdington and had no idea why the difference was so large. GSHSB gave us an itemised quote that broke down every stage of the work. It turned out the cheaper quotes weren’t including certified electrical work or the tanking behind the shower. We went with GSHSB and the installation was exactly as quoted — no surprises.”

Paula and Michael H., Erdington

Book a Free Bathroom Survey with GSHSB

Gas Services & Heating Solutions Birmingham provides full bathroom installations across Birmingham, Solihull, and the West Midlands. Every project includes Gas Safe registered plumbing and heating work, Part P electrical compliance, fixed-price itemised quotations, and all relevant certificates on completion.

We offer a free home survey within 48 hours across the Birmingham area. All quotations are itemised, fixed in writing, and include no hidden charges — the only price changes are if you change the specification or if genuinely hidden structural issues are uncovered once strip-out begins.

 

Book Your Free Bathroom Survey

“Visit gshsb.co.uk or call us to book your free survey. We cover Birmingham, Solihull, and the West Midlands. Fixed-price quotation provided within 48 hours of survey.”

Frequently Asked Questions

What is typically included in a professional bathroom installation?

A complete professional bathroom installation covers twelve stages: strip-out and waste removal, first-fix plumbing, first-fix electrics, waterproofing and boarding, floor preparation, suite installation (bath, toilet, basin, shower), second-fix plumbing, tiling, second-fix electrics, flooring, siliconing and finishing, and sign-off with all relevant certificates. Labour accounts for 45–60% of the total cost. A quote that does not break down these stages individually is worth querying before signing.

Does bathroom installation require planning permission?

In most cases, no. A standard bathroom replacement or refurbishment is permitted development in England and does not require planning permission. However, if the bathroom is being added to a room that previously had no bathroom function — for example, converting a bedroom into an ensuite in a listed building or conservation area property — you should check with Birmingham City Council before starting work. All structural changes to the building require Building Regulations notification regardless of planning status.

Is electrical work in a bathroom legally required to be certified?

Yes. All electrical work in a bathroom is notifiable under Part P of the Building Regulations in England. This means either a Part P registered electrician carries out the work and issues an Electrical Installation Certificate, or the work is notified to your local Building Control for inspection. Uncertified bathroom electrical work is a legal liability that will surface when you sell the property. GSHSB uses Part P registered electricians on all bathroom projects.

Can I supply my own fixtures and have GSHSB install them?

Yes. GSHSB offers both supply-and-fit (where we source the suite) and fit-only (where you supply the fixtures) services. If you source your own bath, toilet, basin, and shower from a retailer, we will install them at the labour rate. Supply-and-fit offers the convenience of a single point of contact and responsibility; fit-only gives you full control over product selection and can reduce the overall project cost by £500–£1,500 depending on the specification.

How do I know if I’m getting a fair price for a bathroom in Birmingham?

Request at least three itemised quotations from traders who can demonstrate relevant qualifications: Gas Safe registration for plumbing and heating work, Part P registration for electrical work, and verifiable reviews from Birmingham area customers. A quotation that is 30–40% below others in the same specification range is usually missing something — most commonly certified electrical work, waterproofing, or waste disposal. In Birmingham in 2026, a complete bathroom installation including all trades and certificates costs between

£4,500 and £7,500 for a standard like-for-like replacement, and £7,500–£12,000 for a mid-range renovation with layout changes.