Water softener cost in Reading: is it worth it?

Reading's water is very hard, so a water softener is one of the most common upgrades people ask plumbers about. The prices below are typical UK and South East ranges from price guides, checked in November 2026. They're a guide for judging quotes, not a fixed price for any home.

How much does a water softener cost to install?

The total depends mostly on the type of softener and how easy it is to connect it near your stop valve.

• Compact softener, fitted: typically £600 to £1,000.
• Standard softener, fitted: typically £900 to £1,500.
• Twin-cylinder softener, fitted: typically £1,300 to £2,000.
• Premium block-salt models: often £1,400 to £2,500 fitted.
• Typical South East total: around £1,060 to £1,770.

If you buy the unit yourself, plumbers typically charge around £300 to £600 to fit it. Check the plumber is happy to fit a unit they haven't supplied, as some prefer not to.

What extra costs should you expect?

• A separate drinking water tap: typically £80 to £250.
• A new or long drain connection for the softener's waste water: typically £80 to £200.
• An electrical spur for an electric model: typically £80 to £150, and this part is a job for an electrician.
• Salt: around £40 to £80 a year for block salt in a typical household, depending on how much water you use.
• A scale reducer instead, if you only want to protect the boiler: typically £30 to £200.

Is a water softener worth it in Reading?

Price guides suggest a softener is worth considering once water hardness is above about 200 ppm. A 2025 survey measured Reading at 329 ppm, the ninth hardest UK city in that study, and Thames Water describes all the water in its area as hard.

The benefits are practical rather than dramatic: far less scale on taps, shower screens and kettles, less descaling, appliances and heating elements that stay efficient for longer, and less soap and detergent needed. British Water says 1 mm of limescale can increase the energy used to heat water by 7 to 10 percent, so keeping scale off heating elements also helps running costs.

It's less likely to be worth it if you rent, plan to move soon, or have no sensible place to fit the unit near the incoming main.

Types of water softener

• Block-salt twin-cylinder: runs on water pressure with no electricity, and one cylinder works while the other regenerates, so you always have soft water.
• Electric timer softeners: regenerate on a set schedule. Usually cheaper to buy but can use more salt.
• Electric metered softeners: regenerate based on how much water you've used, which can save salt.
• Scale reducers and electronic descalers: not softeners. They can reduce scale in one appliance but leave the water hard.

Do you need a separate drinking water tap?

Thames Water advises against using softened water for drinking or cooking, and recommends a separate tap if you fit a softener. Most installers leave the kitchen cold tap on hard water or fit a small extra tap or three-way tap. Ask for this in the quote so it isn't a surprise extra.

Rules for fitting a water softener

• The installation must meet the Water Supply (Water Fittings) Regulations 1999.
• The softener and fittings should be WRAS approved or otherwise shown to meet the regulations.
• The waste pipe needs a proper air gap so dirty water can't be drawn back into the supply.
• Some installations need notifying to the water company. An approved plumber, such as a WaterSafe member, will know when.

Questions to ask before you buy a water softener

1. Is the unit sized for my household and my water hardness?
2. Where will it go, and how will it connect to a drain?
3. Does the price include a drinking water tap, bypass valve and testing?
4. Is it electric or non-electric, and what will salt cost a year?
5. What warranty comes with the unit and the installation?