The cost to add a bathroom varies widely depending on location, size, type, and features, but here are the general estimates for 2025:

In the UK

• Installing a new bathroom (including materials) typically costs between £5,500 and £8,000 , with an average around £7,000 for a standard bathroom

• High-end or larger bathrooms can cost £14,000+

• Individual fixture installation costs range roughly from £100 for a basin to £800 for a shower enclosure

• A full bathroom renovation including plumbing, tiling, flooring, and electrical work can range from about £5,000 to £15,000+ , depending on complexity and materials

In the US

• Adding a bathroom generally costs between $5,000 and $75,000 , with an average around $35,000

• The cost per square foot is typically $200 to $300 for standard bathrooms, and $450 to $600 for luxury additions

• By bathroom type, average costs are:
  • Half bathroom (powder room): $4,000–$12,000
  • Full bathroom: $10,000–$50,000
  • Master bathroom: $22,000–$90,000 or more

• Plumbing can cost between $1,000 and $10,000 depending on complexity, with electrical work adding $500–$2,500

• Labor, fixtures, tile, flooring, permits, and other expenses add to the total, with labor alone ranging from $3,000 to $10,000

Summary

• For a standard new bathroom , expect around £7,000 in the UK or $35,000 in the US.
• For luxury or larger bathrooms , costs can easily exceed £14,000+ or $75,000+.
• Costs depend heavily on bathroom size, fixture quality, plumbing complexity, and location within the home.

This range should help you budget realistically for adding a bathroom in 2025