Upgrades

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About us

How it works

Upgrades

Learn

Get Quote

About us

How it works

Upgrades

Learn

Get Quote

Step 1: Understanding your home before you spend a penny

So you can fix problems before they get worse, and spend only on the stuff that will make your home comfortable all year round.

Catch problems before they get worse

Know what to fix first

Spend only where it makes a difference

A 3D model of a three-storey home: the digital twin built from the survey

The problem: Everyone else has a partial view of your house and you need the full picture

Energy certificate

A rating, not how your home performs

Installer

Only looks at the part relevant to them

Architect

Possible with additional qualifications, but can cost thousands

Furbnow

The complete picture

Covers it

Partly or sometimes

Doesn’t

Breathability: whether your home gets enough fresh air to clear damp and stay healthy.

Condition: damp, damage and wear, like cracked mortar, that lose heat and can stop upgrades working.

The problem: Everyone else has a partial view of your house and you need the full picture

Energy certificate

A rating, not how your home performs

Installer

Only looks at the part relevant to them

Architect

Possible with additional qualifications, but can cost thousands

Furbnow

The complete picture

Covers it

Partly or sometimes

Doesn’t

Breathability: whether your home gets enough fresh air to clear damp and stay healthy.

Condition: damp, damage and wear, like cracked mortar, that lose heat and can stop upgrades working.

The problem: Everyone else has a partial view of your house and you need the full picture

Energy certificate

A rating, not how your home performs

Installer

Only looks at the part relevant to them

Architect

Possible with additional qualifications, but can cost thousands

Furbnow

The complete picture

Covers it

Partly or sometimes

Doesn’t

Breathability: whether your home gets enough fresh air to clear damp and stay healthy.

Condition: damp, damage and wear, like cracked mortar, that lose heat and can stop upgrades working.

Our Solution: How we get the full picture of your unique home

The in-person survey

A Retrofit Assessor visits and works through 41 checks across five areas. They record what your walls, roof and floors are made of and how thick they are, and use a small camera where needed to see inside them.

Measurements

Materials

Energy systems

Damp and defects

Your property

Your energy bills and documents go in too, if you choose to share them.

Your digital twin: a 3D model of your home

The survey feeds a 3D energy model of your actual home, not a generic house of the same age. From it, we calculate:

Heat loss
Where your home loses heat, by building element.
Heat loss by room
Which rooms lose the most, so heating can be sized right.
Overheating risk
Which rooms may overheat in summer, where cooling matters.
Ventilation needs
Whether each room gets enough fresh air to clear damp and stay healthy.

Then we test every upgrade on it before you spend

The same twin is used from your survey to your plan, so all the advice fits together, and the order of works fits around your builders.

Our Solution: How we get the full picture of your unique home

The in-person survey

Measurements

Materials

Energy systems

Damp and defects

Your property

Your energy bills and documents go in too, if you choose to share them.

Your digital twin: a 3D model of your home

The survey feeds a 3D energy model of your actual home, not a generic house of the same age. From it, we calculate:

Heat loss
Where your home loses heat, by building element.
Heat loss by room
Which rooms lose the most, so heating can be sized right.
Overheating risk
Which rooms may overheat in summer, where cooling matters.
Ventilation needs
Whether each room gets enough fresh air to clear damp and stay healthy.

Then we test every upgrade on it before you spend

The same twin is used from your survey to your plan, so all the advice fits together, and the order of works fits around your builders.

Our Solution: How we get the full picture of your unique home

The in-person survey

Measurements

Materials

Energy systems

Damp and defects

Your property

Your energy bills and documents go in too, if you choose to share them.

Your digital twin: a 3D model of your home

The survey feeds a 3D energy model of your actual home, not a generic house of the same age. From it, we calculate:

Heat loss
Where your home loses heat, by building element.
Heat loss by room
Which rooms lose the most, so heating can be sized right.
Overheating risk
Which rooms may overheat in summer, where cooling matters.
Ventilation needs
Whether each room gets enough fresh air to clear damp and stay healthy.

Then we test every upgrade on it before you spend

The same twin is used from your survey to your plan, so all the advice fits together, and the order of works fits around your builders.

What your digital twin shows

Your digital twin is a 3D energy model of your home. It uses your home’s construction type to calculate heat loss, overheating and ventilation, in line with the relevant British standards.

Which rooms lose the most heat

You see which rooms lose the most heat, so you know what to prioritise.

How the condition of materials affects heat loss

How condition of materials affects heat loss

Older windows lose performance over time. We record the condition of each material so your model reflects how the home performs today.

Which rooms may overheat

Insulation that fixes a cold winter can create a hot summer. We work out an overheating figure for each room, so you plan for both.

Checked before it’s released

Our internal quality assurance team and AI reviews your model and any outputs before it’s released.

How our 41 point survey works

Measurements

Room sizes, surfaces and roof pitch.

Includes

Room sizes and heights

Wall, roof and floor areas

Which way the house faces

Materials

What your walls, roof, floors and windows are made of.

Includes

Construction and thickness

Glazing and frame type and age

Cold spots and tricky details

Heating, hot water & solar

Boiler, radiators, hot water, ventilation and any solar.

Includes

Heating and radiators

Hot water cylinder and pipework

Ventilation, solar and battery

Damp and defects

Damp, cracks, and failing insulation or ventilation.

Includes

Damp and mould

Cracked mortar, covered air bricks

Likely causes, like gutters and drainage

Your property

Age, type, listing status, and your energy bills.

Includes

Age, type and number of rooms

Listed or conservation area

Shading, access and energy bills

Where needed, we use a small camera to see inside walls and floors.

Loft insulation

Measured for depth, and checked by eye.

Cavity walls

A camera through small drill holes.

Floors

A camera through accessible air vents.

Before the visit

Share your bills and plans

Any energy bills and planning documents you have.

On the day

We see the whole house

Your assessor needs access to every part of it.

After the visit

We build your twin

A second pair of eyes checks it before it’s released.

How our 41 point survey works

Measurements

Room sizes, surfaces and roof pitch.

Includes

Room sizes and heights

Wall, roof and floor areas

Which way the house faces

Materials

What your walls, roof, floors and windows are made of.

Includes

Construction and thickness

Glazing and frame type and age

Cold spots and tricky details

Heating, hot water & solar

Boiler, radiators, hot water, ventilation and any solar.

Includes

Heating and radiators

Hot water cylinder and pipework

Ventilation, solar and battery

Damp and defects

Damp, cracks, and failing insulation or ventilation.

Includes

Damp and mould

Cracked mortar, covered air bricks

Likely causes, like gutters and drainage

Your property

Age, type, listing status, and your energy bills.

Includes

Age, type and number of rooms

Listed or conservation area

Shading, access and energy bills

Where needed, we use a small camera to see inside walls and floors.

Loft insulation

Measured for depth, and checked by eye.

Cavity walls

A camera through small drill holes.

Floors

A camera through accessible air vents.

Before the visit

Share your bills and plans

Any energy bills and planning documents you have.

On the day

We see the whole house

Your assessor needs access to every part of it.

After the visit

We build your twin

A second pair of eyes checks it before it’s released.

How our 41 point survey works

Measurements

Room sizes, surfaces and roof pitch.

Includes

Room sizes and heights

Wall, roof and floor areas

Which way the house faces

Materials

What your walls, roof, floors and windows are made of.

Includes

Construction and thickness

Glazing and frame type and age

Cold spots and tricky details

Heating, hot water & solar

Boiler, radiators, hot water, ventilation and any solar.

Includes

Heating and radiators

Hot water cylinder and pipework

Ventilation, solar and battery

Damp and defects

Damp, cracks, and failing insulation or ventilation.

Includes

Damp and mould

Cracked mortar, covered air bricks

Likely causes, like gutters and drainage

Your property

Age, type, listing status, and your energy bills.

Includes

Age, type and number of rooms

Listed or conservation area

Shading, access and energy bills

Where needed, we use a small camera to see inside walls and floors.

Loft insulation

Measured for depth, and checked by eye.

Cavity walls

A camera through small drill holes.

Floors

A camera through accessible air vents.

Before the visit

Share your bills and plans

Any energy bills and planning documents you have.

On the day

We see the whole house

Your assessor needs access to every part of it.

After the visit

We build your twin

A second pair of eyes checks it before it’s released.

Built by our experts

Beyond industry standards

We don’t just look at SAP scores and give high-level recommendations. Everything is designed and simulated for your home, with the heat pump, insulation, ventilation and cooling all working together.

Built with experience

Software gives us the numbers, and our team’s judgement covers what can’t be measured. Your twin is built by a Retrofit Assessor and reviewed by a Retrofit Consultant.

Built to British standards

PAS 2035

1,000+ homes