flat roof extension cost

Flat Roof Replacements

Our flat roof replacements are a great way to let in natural light while creating the feeling of a larger space. At Coral, we install a well-insulated, modern roof that blends seamlessly with your home, improves everyday comfort, and increases long-term value.

September Offer: Save up to 50% off + Free Upgrade to Triple Glazing*
  1. The “Up to 50% Discount On Selected Items, including Free Upgrade to Triple Glazing on Selected Frames Offer” is available on qualifying orders placed between 01.09.2026 & 30.09.2026.
  2. Up to 50% Discount On Selected Items, including Free Upgrade to Triple Glazing on Selected Frames Offer” must be stated in writing on the contract at the point of sale. Coral cannot be held responsible for claims placed after this time.
  3. The “Up to 50% Discount On Selected Items, including Free Upgrade to Triple Glazing on Selected Frames Offer” applies to any tilt & turn windows or French doors, manufactured by Coral only, with frame colour being either Cedar Grey foil on both sides, Pepper Oak on Both sides, Cedar Grey foil outside and smooth white (i.e. not grained) uPVC inside or Pepper Oak foil outside and smooth white (i.e. not grained) uPVC inside.
  4. The “Up to 50% Discount On Selected Items, including Free Upgrade to Triple Glazing on Selected Frames Offer” cannot be applied to conservatory frames.
  5. The “Up to 50% Discount On Selected Items, including Free Upgrade to Triple Glazing on Selected Frames Offer” does not apply to uPVC casement windows, uPVC flush casement windows, CL3 range of triple-glazed windows, uPVC residential doors, composite doors, inline patio doors, aluminium bi-folding doors, conservatory roofs or Vertical Sliding Sash windows.
  6. The “Up to 50% Discount On Selected Items, including Free Upgrade to Triple Glazing on Selected Frames Offer” offer does not apply to any building works, internal sills, window boards or trims.
  7. The maximum size for any triple glazed glass unit is 1.7m2 due to health & safety reasons. Where a required unit size is larger, a double-glazed unit will be supplied and installed. 
  8. There is no minimum order value to qualify for the “Up to 50% Discount On Selected Items, including Free Upgrade to Triple Glazing on Selected Frames Offer”.

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Terms and Conditions

Up to 50% Discount On Selected Items, including Free Upgrade to Triple Glazing on Selected Frames Offer Terms and Conditions:

  1. The “Up to 50% Discount On Selected Items, including Free Upgrade to Triple Glazing on Selected Frames Offer” is available on qualifying orders placed between 01.09.2026 & 30.09.2026.
  2. Up to 50% Discount On Selected Items, including Free Upgrade to Triple Glazing on Selected Frames Offer” must be stated in writing on the contract at the point of sale. Coral cannot be held responsible for claims placed after this time.
  3. The “Up to 50% Discount On Selected Items, including Free Upgrade to Triple Glazing on Selected Frames Offer” applies to any tilt & turn windows or French doors, manufactured by Coral only, with frame colour being either Cedar Grey foil on both sides, Pepper Oak on Both sides, Cedar Grey foil outside and smooth white (i.e. not grained) uPVC inside or Pepper Oak foil outside and smooth white (i.e. not grained) uPVC inside.
  4. The “Up to 50% Discount On Selected Items, including Free Upgrade to Triple Glazing on Selected Frames Offer” cannot be applied to conservatory frames.
  5. The “Up to 50% Discount On Selected Items, including Free Upgrade to Triple Glazing on Selected Frames Offer” does not apply to uPVC casement windows, uPVC flush casement windows, CL3 range of triple-glazed windows, uPVC residential doors, composite doors, inline patio doors, aluminium bi-folding doors, conservatory roofs or Vertical Sliding Sash windows.
  6. The “Up to 50% Discount On Selected Items, including Free Upgrade to Triple Glazing on Selected Frames Offer” offer does not apply to any building works, internal sills, window boards or trims.
  7. The maximum size for any triple glazed glass unit is 1.7m2 due to health & safety reasons. Where a required unit size is larger, a double-glazed unit will be supplied and installed. 
  8. There is no minimum order value to qualify for the “Up to 50% Discount On Selected Items, including Free Upgrade to Triple Glazing on Selected Frames Offer”.

Free Upgrade To Triple Glazing Offer Terms and Conditions:

  1. The “Free Upgrade To Triple Glazing offer” is available on qualifying orders placed between 01.09.26 & 30.09.26 while stocks last.
  2. Free Upgrade To Triple Glazing offer” must be stated in writing on the contract at the point of sale.  Coral cannot be held responsible for claims placed after this time.
  3. The “Free Upgrade To Triple Glazing offer” applies to standard double-glazed casement windows only (excludes flush sash windows and sash horn casements) in any of the following foiled, grained finishes in our range: Agate Grey, Anthracite Grey, Anthracite Smooth Matt, Black Ash, Black Smooth Matt, Cedar Grey, Chartwell Green, Claystone, Cream, Golden Oak, Grey 004, Grey Aluminium, Honey Oak Super Matt, Irish Oak, Nut Tree, Pepper Oak, Rosewood, Slate Grey or Yakisugu (external frame colour only, inside must be smooth White), manufactured by Coral only & where goods are installed within 12 weeks of order date.
  4. The “Free Upgrade To Triple Glazing offer” cannot be applied to conservatory frames.
  5. The “Free Upgrade To Triple Glazing offer” does not apply to Smooth White uPVC or White grained uPVC casement windows.
  6. The “Free Upgrade To Triple Glazing offer” is an upgrade to our “Standard Triple Glazed Range”, it does not include our CL3 Triple Glazed Range.
  7. The “Free Upgrade To Triple Glazing offer” does not apply to uPVC flush sash casement windows, uPVC doors, composite doors, inline patio doors, Inox doors, Rock Doors, uPVC bi-folding doors, aluminium bi-folding doors, conservatory roofs or V/S windows.
  8. The “Free Upgrade To Triple Glazing offer” only applies to tilt & turn windows &/or French doors which qualify for the Up to 50% Discount on Selected Items offer detailed above.
  9. The “Free Upgrade To Triple Glazing offer” cannot be used in conjunction with the “50% Off On Selected Items Offer” unless the frames are tilt & turn windows &/or French doors which qualify for the Up to 50% Discount on Selected Items offer detailed above.
  10. There is no minimum order value to qualify for the “Free Upgrade To Triple Glazing offer”.

 

Free Conservatory Roof Glass Upgrade Terms and Conditions:

  1. The “Free Conservatory Roof Glass Upgrade offer” is available on qualifying orders placed between 01.09.2026 & 30.09.2026.
  2. Free Conservatory Roof Glass Upgrade offer” must be stated in writing on the contract at point of sale.  Coral cannot be held responsible for claims placed after this time.
  3. The “Free Conservatory Roof Glass Upgrade offer” can only be applied to orders containing Coral Premium Roofs.
  4. The “Free Conservatory Roof Glass Upgrade offer” can be applied to the following: –
  • Ambi-Blue Self-Cleaning (1.2 uValue) can be upgraded to Ambi-Sunshade Blue Self-Cleaning (1.0 or 1.2 uValue).
  • Ambi-Blue Self-Cleaning (2.7 uValue) can be upgraded to Ambi-Sunshade Blue Self-Cleaning (2.7 uValue).
  • Ambi-Neutral Self-Cleaning (1.2 uValue) can be upgraded to Ambi-Aqua Self-Cleaning (1.0 or 1.2 uValue).
  • Ambi-Neutral Self-Cleaning (2.7 uValue) can be upgraded to Ambi-Aqua Self-Cleaning (2.7 uValue).
  • Ambi-Blue Self-Cleaning or Ambi-Neutral Self-Cleaning (1.2 uValue) can be upgraded to Ambi-Ultra Self-Cleaning (1.0 or 1.2 uValue).

 

Lowest Price Guarantee terms and conditions:

Our price promise has held Coral in good stead with our customers for over 35 years. We will not be beaten on price (please refer to terms and conditions below for further details when comparing to other quotes from other companies), they must have:

  1. The specification of the product must be fully sculptured 70mm profile.
  2. The styles and sizes must be detailed on a letter headed quotation.
  3. Conservatory frames – windows and doors should be of the same quantity, styles and design specification.
  4. Conservatory roofs – must be of same design specification.  “Tiled” conservatory roofs must be Ultraroof.
  5. Warranties for each of the products must either be the same of better.
  6. Have an Insurance Backed Guarantee (where work is covered by FENSA).
  7. Have a BSI kitemark for survey and installation.
  8. Be FENSA regulated.
  9. Manufacture their own products.

It is important to bear in mind that Coral Windows and Conservatories have been in business with continuous trading for over 35 years and we do not take a deposit or stage payments and only ask for payment when the goods are installed. This gives you, our customers 100% peace of mind.

Our CL3 Triple Glazed Range and other triple glazed windows are subject to size restrictions and style limitations due to the weight of the glass – see your representative for details. The maximum size for any triple glazed glass unit is 1.7m2 due to health & safety reasons. Where a required unit size is larger, an A-rated double-glazed unit will be supplied and installed.

“Self-cleaning” glass is not a ‘100% maintenance-free’ product but does offer a reduced need for manual cleaning.

 

*New windows from Coral could save our customers hundreds of pounds on their heating bills*

You can check both your potential savings on heating costs and your CO2 savings by entering a few simple details into our energy calculator which can be found on our website https://www.coralwindows.co.uk

As an example, a typical customer (living in a semi-detached house which has wooden single glazed windows and mains gas heating) could save approx. £911 on their heating bill over the course of the first 12 months after they had new double-glazed windows installed by Coral Windows (information correct as at 13/10/2023).  Potential savings will vary depending on the information entered into the energy calculator.  

Energy Efficiency

Flat roof replacements use thick, high-performance insulation and modern construction to reduce heat loss and keep temperatures comfortable all year. This improved thermal performance can help lower energy use and make the space feel more like a true extension of your home.

Weather Resistant

Designed to cope with rain, wind, and sun weather conditions, modern flat roofs use durable materials, waterproof layers, and robust engineering to keep your conservatory protected and dry in all seasons.

Highly Secure

A solid flat roof creates a strong, secure roof that meets building standards and withstand everyday wear, giving you confidence that your conservatory is safe and built to last.

Flexible Payments

We never ask for a deposit on a home extension, and we don’t take stage payments at any point. With Coral, you only pay once you are happy with your extension.

Flat roof replacement

Flat Roof Replacement in Yorkshire

At Coral, we know a flat roof replacement is more than just an upgrade, it’s an opportunity to improve the comfort, appearance and performance of your Yorkshire home. A new flat roof helps create a warmer, more energy-efficient space while protecting your property from the elements for years to come. That’s why we take the time to understand exactly what you need.

Our experienced team will be with you every step of the way to ensure the process is straightforward and stress-free. Whether you’re replacing the roof on a conservatory or extension, we’ll provide a high-quality solution that’s built to last and works well with your home.

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Why Choose a Flat Roof Replacement?

Our flat roof replacement achieves a U value of 0.12 W/m²K, resulting in a very energy efficient roof that keeps your home warm and comfortable.

Made with the latest self cleaning glass technology for easier maintenance.

Our flat roof replacements are a great way to increase market value, which could make sure your home is desirable to buyers.

Our roof lanterns are available with a 10 year guarantee for complete peace of mind.

Flat Roof Replacements Benefits

Take a look at some of our key benefits of flat roof replacements and discover why they’re a popular choice for creating bright, comfortable living spaces.

Flat roof replacement

Sleek, Modern Appearance

A flat roof replacement gives your conservatory a clean, contemporary look that blends seamlessly with your home and can refresh the overall style. It can also help the space feel more like a natural extension rather than a separate room.

flat roof extension cost

Enhanced Comfort

Modern insulation helps keep your conservatory warmer in winter and cooler in summer, making the space far more usable. This creates a more consistent temperature so you can enjoy the room every day.

Flat roof replacement Coral

Long-Lasting Protection

Built with durable materials, a new flat roof helps protect your space from the elements while providing reliable performance for years to come. This added durability gives you peace of mind throughout the year.

See what our customers say about us

With thousands of installations completed, our reputation is built on happy customers. Explore their stories and discover why Coral is trusted for quality, service, and lasting value.

double glazing bradford

Transforming the Kellett Home with Modern Style and Light

jon mitchell

ITV Weatherman John Mitchell Upgrades His Home with Coral Windows

nicola adams

Olympic Champion Nicola Adams Chooses Coral Windows

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Mrs Watts modernised her whole home with new windows, doors, and roofline

kellet family

Mr & Mrs Evans – Transforming Their Living Space with Bifold Doors

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From Dilapidated to Dream Home: A Coral Windows Transformation

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Surprise! Bradford Couple Wins Dream Home Upgrade in Coral Windows Prize Draw

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We’re delighted to introduce Mr & Mrs Armitage, our May 2025 Competition Winners!

Frequently Asked Questions

What is a flat roof replacement?

A flat roof replacement involves removing your existing conservatory or extension roof and installing a new, modern system with improved insulation and weather protection. It’s a great way to upgrade the comfort, appearance, and performance of your space without needing a full rebuild.

Why should I replace my flat roof?

How long does it take to complete a flat roof replacement build?

How long will a new flat roof last?

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