How to Plan Temporary Heating and Hot Water During a Home Renovation
Planning temporary heating and hot water during a home renovation often only becomes urgent when the boiler is switched off and the house turns cold overnight. A very common scenario in UK homes is a winter boiler replacement or major refurb where the system is disconnected on day one, then delays push reconnection back by a week or more. At that point you are dealing with cold rooms, no showers, unhappy occupants, and trades struggling to work efficiently. The good news is that with the right setup in place before work starts, you can keep your home usable, protect materials, and avoid costly disruption.
This guide draws on practical site experience to help you plan ahead properly. It covers realistic options, costs, safety considerations, and how to keep your project moving without unnecessary discomfort.
Why Temporary Heating and Hot Water Planning Matters
Most homeowners underestimate how often heating and hot water systems are taken offline during renovations. Even relatively small works can require system shutdowns. Common scenarios include:
- Full boiler replacement or relocation
- Upgrading from a conventional system to a combi boiler
- Installing underfloor heating
- Moving pipework for extensions or layout changes
- Complete strip outs where services are disconnected
Without temporary provision, you face cold indoor temperatures, no washing facilities, and in some cases trades being unable to continue work. Plasterers, decorators, and flooring installers all rely on controlled temperatures to achieve proper finishes.
If you are also dealing with wider service interruptions, it is worth reviewing Planning utility shut offs during a home renovation, checklist for water gas and electrics so everything is coordinated.
How Long Will You Be Without Heating or Hot Water
The duration depends on the scope of work and how well it is scheduled. Typical timelines in UK projects are:
- Boiler swap in the same location, one to two days
- Full system upgrade, three to seven days
- Major refurbishment or extension, two to six weeks with intermittent outages
- Full house renovation, several weeks without a connected system
Real world timelines often stretch. Waiting for parts, failed pressure tests, or coordination issues between trades can easily add three to ten days. If your renovation includes structural work such as knocking through walls or extensions, heating is usually one of the last systems to be fully recommissioned.
Temporary Heating and Hot Water During a Home Renovation
Planning temporary heating and hot water during a home renovation should be treated as part of your core build programme, not an afterthought. The right setup depends on whether you are living in the property, how many rooms you need to keep warm, and how long services will be unavailable.
For short outages, electric heaters and point of use water heaters can be enough. For anything longer than a week in a lived in home, a temporary boiler setup or staged installation approach is usually more cost effective and far more comfortable.
Temporary Heating Options for UK Homes
There is no single solution that suits every project. The right approach depends on your budget, property size, insulation levels, and occupancy.
Electric Heaters
Electric heaters are the most common short term solution. They are easy to set up and widely available.
Options include:
- Oil filled radiators, steady background heat
- Fan heaters, quick heat for small spaces
- Infrared panels, efficient directional heating for occupied areas
How to size electric heaters
A practical rule used on UK sites is around 100 watts per square metre for a reasonably insulated room. Poor insulation or older properties may need 120 to 150 watts per square metre.
Examples:
- Small bedroom, 10 m², around 1 kW heater
- Living room, 20 m², around 2 kW heater
- Open plan area, 40 m², 3 kW to 4 kW split across multiple units
Running cost examples
Electricity at 30p per kWh:
- 2 bed flat using 3 heaters at 2 kW each for 6 hours per day, around £10 to £11 per day
- 3 bed semi using 5 heaters, around £18 to £25 per day
Insulation makes a significant difference. A well insulated new build might use half this energy compared to a draughty Victorian property.
They are suitable for short periods or for heating one or two rooms. Running multiple units across a whole house becomes expensive quickly.
Temporary Boiler Hire
For larger projects or occupied homes, a temporary boiler is often the most practical solution. These systems connect into your existing pipework and can supply full central heating and hot water.
Typical costs in the UK:
- Hire, £150 to £300 per week depending on output
- Installation and setup, £300 to £800
- Fuel or electricity, varies depending on system type
- Delivery and collection, £100 to £250 depending on location
A small domestic temporary boiler might be 24 kW to 35 kW, suitable for a standard three bed home. Larger units are available for bigger properties.
This option is ideal if you are staying in the property for more than a week without heating, or during winter works.
LPG or Diesel Space Heaters
These are more common on building sites than in lived in homes.
They provide high heat output but come with clear downsides:
- Require ventilation
- Produce fumes and moisture
- Fire and carbon monoxide risks
They should only be used by professionals and never in enclosed domestic spaces.
Underfloor Heating Commissioning
If you are installing underfloor heating, it cannot usually be used immediately. Screeds require drying times:
- Standard sand and cement screed, around 1 mm per day up to 40 mm
- Liquid screed, faster but still requires several days before commissioning
In practice, most projects cannot rely on underfloor heating for at least one to three weeks after installation.
Temporary Hot Water Solutions
Hot water disruption is often harder to manage than heating. You can layer solutions depending on household size and usage.
Electric Instant Water Heaters
These supply hot water on demand at a single outlet.
- Unit cost, £100 to £300
- Installation by qualified electrician, £150 to £400
- Typical flow rate, 2 to 6 litres per minute
They are suitable for:
- Single occupants
- Kitchen sinks or occasional showers
Limitations include lower flow and temperature fluctuations, particularly in winter when incoming mains water is colder.
Portable Water Heaters or Tanks
Used on sites and sometimes in domestic projects.
- Hire cost, £50 to £150 per week
- Capacity, 10 to 50 litres typical
They work well for hand washing or light kitchen use but are not practical for full households.
Temporary Shower Units
Often installed in garages, gardens, or spare rooms.
Typical hire and setup:
- Hire, £70 to £200 per week
- Setup including plumbing, £200 to £500
- Flow rate, typically 6 to 10 litres per minute depending on supply
Suitable for families during bathroom renovations. They can run off mains or a temporary boiler setup.
If you are reconfiguring bathrooms entirely, it is worth reading How to plan temporary bathroom facilities during a home renovation without disruption to avoid overlap issues.
Temporary Boiler with Cylinder
This is the closest match to a normal household setup.
Benefits include:
- Multiple outlets at once
- Stable temperatures
- Suitable for families
This is the best option where more than two people are living in the property during works.
Coordinating Heating with Temporary Power
Electric heaters and water systems place significant load on your temporary electrics.
Example load calculation
If you run:
- 4 heaters at 2 kW each
- 1 instant water heater at 8 kW
Total load equals 16 kW. On a typical 230V supply, that is around 70 amps, which can exceed the capacity of a standard domestic setup.
You must consider:
- Consumer unit capacity
- RCD protection for all temporary circuits
- Avoiding overloading extension leads
Extension leads are a known fire risk when powering heaters continuously. Fixed circuits installed by a qualified electrician are far safer.
Work should comply with Part P of the Building Regulations and BS 7671. Use a competent person scheme member such as NICEIC. You can check guidance from NICEIC.
On larger projects, a temporary site supply or generator may be required, particularly if the main consumer unit is removed or upgraded early in the build.
For a full overview, see How to plan temporary power and lighting for a home renovation without delays or safety risks.
Safety and Legal Considerations
Temporary systems still fall under UK safety regulations and Building Regulations.
Building Regulations
Relevant parts include:
- Part L, energy efficiency and heating systems
- Part P, electrical safety
You can review official guidance at https://www.gov.uk/building-regulations-approval.
Gas Safety
Any work involving boilers, gas heaters, or connections must be carried out by a Gas Safe registered engineer.
You can verify engineers at Gas Safe Register.
Electrical Safety
Temporary installations must meet BS 7671. NICEIC or similar registered electricians should carry out the work.
Ventilation and Carbon Monoxide
Never use fuel burning heaters indoors without proper ventilation. Carbon monoxide alarms should be installed where any combustion equipment is used.
Guidance from the Health and Safety Executive can be found here: https://www.hse.gov.uk.
Rental Properties
Landlords have a legal duty to provide safe heating and hot water. During renovations, temporary systems must still meet safety standards. Failure can breach tenancy agreements and housing regulations.
Cost Breakdown Comparison
| Option | Upfront Cost | Weekly Running Cost | Additional Costs | Best For |
|---|---|---|---|---|
| Electric heaters | £30 to £150 each | £20 to £80+ | Electrician callout £80 to £200 | Single rooms or short term use |
| Temporary boiler hire | £300 to £800 setup | £150 to £300 plus fuel | Delivery £100 to £250, fuel £50 to £150 per week | Whole house heating and hot water |
| Instant water heater | £250 to £700 installed | Moderate electricity | Electrical upgrades if needed | Kitchen or single bathroom |
| Portable shower units | £200 to £500 setup | £70 to £200 hire | Plumbing connections £100 to £300 | Bathroom renovations |
For short projects under one week, electric heaters and small water heaters are usually the lowest cost option. For anything longer, especially in winter or larger homes, temporary boiler hire often becomes better value once energy costs and comfort are factored in.
Stay in the Property or Move Out
| Factor | Stay in Property | Move Out Temporarily |
|---|---|---|
| Cost | Lower upfront, higher energy costs | Higher accommodation cost |
| Comfort | Reduced comfort, disruption | Normal living conditions |
| Project speed | Often slower due to constraints | Faster with full access |
| Best suited for | Short works, partial shutdowns | Full refurbishments or winter builds |
How to Phase Work to Reduce Disruption
Good planning can significantly reduce downtime.
Example timeline:
- Week 1, install new pipe runs while old system remains active
- Week 2, prepare new boiler location and electrics
- Day 1 of changeover, disconnect old system in the morning
- Day 2, install and test new system
- Day 3, full commissioning and heating restored
Overlapping trades like this avoids total loss of heating for extended periods.
What About Winter Renovations
Winter adds extra risk:
- Plastering requires around 5 to 25 degrees Celsius to dry properly
- Painting typically needs at least 10 degrees Celsius
- Adhesives and flooring materials can fail in low temperatures
There is also a real risk of frozen pipes. To prevent this:
- Drain unused systems where possible
- Insulate exposed pipework
- Maintain background heat above 5 degrees
Temporary heating becomes essential rather than optional.
Choosing the Right Tradespeople
Gas Engineers
Always use Gas Safe registered engineers for any boiler or gas work. Ask for their ID and check online.
Electricians
Use NICEIC or similarly registered electricians for temporary supplies and heater installations.
General Builders
Experienced builders will coordinate heating shutdowns with other trades to minimise disruption.
Platforms like BookaBuilderUK help you find vetted professionals with the right certifications.
Use this checklist early in your planning phase, ideally before work starts and again just before any heating shutdown, to confirm everything is in place.
Practical Planning Checklist
- Confirm when heating and hot water will be turned off
- Allow extra time for delays in construction works
- Decide whether you are staying in the property
- Calculate how many rooms need heating
- Check electrical capacity for heaters
- Arrange temporary hot water solutions before shutdown
- Book qualified engineers early, especially in winter
- Install carbon monoxide alarms where needed
- Plan alternatives such as showering elsewhere if required
Common Mistakes to Avoid
One of the biggest issues is assuming the outage will be brief. Projects rarely stick exactly to schedule. A boiler swap expected to take two days can stretch to a week if parts are delayed.
Underestimating power demand is another frequent problem. Multiple heaters on one circuit can trip breakers or overheat cables.
Incorrect sizing of heaters is also common. A single small heater in a large space will run constantly without reaching a comfortable temperature, increasing costs.
Some homeowners try to cut costs by using site heaters indoors. That is dangerous due to fumes and fire risk.
Poor coordination between trades adds unnecessary downtime. Heating engineers, electricians, and builders should work to a shared timeline.
Finally, not budgeting properly leads to rushed decisions. Temporary systems are a small fraction of total renovation costs but have a large impact on comfort and progress.
FAQs
Can I live in my house without heating during a renovation?
It is possible for short periods in warmer months, but it quickly becomes impractical. In winter, most households will struggle without at least partial heating.
How much does it cost to run electric heaters all day?
A typical 2 kW heater costs around 60p to 80p per hour. Running several units across a house can exceed £20 per day.
Do I need permission to install a temporary boiler?
Planning permission is not usually required, but all work must comply with Building Regulations and be completed by Gas Safe engineers.
Can I use my old boiler while renovations are ongoing?
Often yes, if pipework is not being altered. Many projects keep the old system running until the final switchover.
What is the quickest way to restore heating after a shutdown?
Ensuring the system is filled and pressurised correctly is key. If needed, refer to How to repressurise a boiler in a UK home safely and restore heating and hot water.
What size temporary boiler do I need?
A typical three bed home usually requires a 24 kW to 30 kW temporary boiler. Larger properties may need 35 kW or more. A heating engineer should calculate this based on radiators, insulation, and hot water demand.
Can I get insurance coverage for temporary heating systems?
Some home insurance policies may cover temporary systems if installed by qualified professionals. It is worth informing your insurer before installation to confirm cover and avoid issues.
Final Thoughts
Temporary heating and hot water are not optional extras. They play a central role in keeping your renovation on track, protecting materials, and maintaining a livable space.
If you are preparing for a renovation and need reliable professionals to set up safe temporary systems, you can post a job on BookaBuilderUK to receive free quotes from vetted local tradespeople.
