Your Window & Door Questions Answered
Clear advice to help you choose, repair and improve.
Help with your window and door questions
Unsure whether to repair or replace a window, what causes condensation or what to expect during installation? Find straightforward answers below from Suffolk Doors & Windows, a family-run business near Sudbury serving Suffolk and the surrounding areas.
Choose a topic to find the advice you need. For help with your own property, contact our team.
Jump to a topic:
Repairs & Condensation → Common faults, misted glass, condensation and maintenance.
Choosing Windows & Doors → Materials, styles, colours, security and energy efficiency.
Installation, Costs & Guarantees → Quotes, installation, payment, warranties and certification.
Planning & Building Regulations → Permissions, listed buildings, conservation areas and compliance.
Your Project & Next Steps → Home value, removal of old windows and arranging your project.
Section 1: Repairs, Condensation & Window Lifespan
Find out how to identify common window and door problems, what causes condensation, when repairs may be possible and how long double glazing typically lasts.
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1. How do I know if my windows or doors need replacing?
Signs that your windows or doors may need replacing include draughts, water leaks, damaged frames, failing seals, difficulty opening or closing, faulty locks and condensation between the panes of glass.
However, these problems do not always mean you need a complete replacement. Some issues can be resolved by replacing a seal, adjusting the hinges, repairing a locking mechanism or changing a glass unit.
We can assess the problem and advise whether a repair or replacement is likely to be the most suitable option.
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2. Should I repair my windows or replace them?
It depends on the condition of the frames, glass, seals and opening mechanisms.
A repair may be all that is needed if the frame is in good condition and the problem is limited to a handle, hinge, lock or sealed glass unit. Replacement may be more appropriate if the frames are badly damaged, several components are failing or the windows no longer meet your needs.
If you are unsure, contact us and describe the problem. Photographs can help us understand the issue before deciding whether a visit is necessary.
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3. Why is there condensation on my windows?
Condensation can occur when warm, moist air meets a colder surface.
On the room-side glass: Often caused by indoor humidity, poor ventilation or cold glass surfaces. Improving ventilation and reducing excess moisture may help.
Between the panes of double glazing: Usually indicates that the sealed glass unit has failed and moisture has entered the cavity. Replacing the glass unit may resolve the problem without replacing the entire window.
On the outside glass: Can occur with energy-efficient windows and is not necessarily a fault.
If you are unsure where the condensation is forming, we can help you identify the likely cause.
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4. How long should double-glazed windows last?
The lifespan of double-glazed windows depends on the materials, quality of installation, exposure to weather and how well they are maintained.
Well-maintained windows can last for many years, often 20 years or more, but individual components may need attention sooner. Handles, hinges, locks and sealed glass units can sometimes be repaired or replaced independently of the frame.
Regular cleaning and checking for damage can help you identify problems early.
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5. Can misted double glazing be repaired without replacing the whole window?
Yes, in many cases. If the misting is between the panes of glass because the sealed unit has failed, it may be possible to replace just the glass unit while keeping the existing frame.
Whether this is suitable depends on the condition of the frame and the type of window. A replacement window is not always necessary.
Contact us to discuss the problem and find out which options may be available.
Section 2: Choosing Windows, Doors & Glazing
Explore the options available for window and door styles, materials, colours, security and energy efficiency to help you choose the right products for your home.
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6. What should I look for when choosing a window and door installer?
Choose an installer who is experienced, transparent about costs and happy to explain the options without putting you under pressure.
Before committing, consider:
- Whether the company has credible customer reviews and examples of previous work.
- Whether it provides a clear, written quotation.
- Whether the products and installation are covered by appropriate guarantees.
- Whether the installer can explain relevant building regulations and certification.
- Who will carry out the work and how your home will be protected during installation.
Suffolk Doors & Windows is a family-run business based near Sudbury, offering window and door installation and repair services.
You can read our customer reviews to learn about other customers' experiences.
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7. Are double-glazed windows more secure?
Modern double-glazed windows can offer improved security compared with older windows, particularly when fitted with suitable locks, robust frames and security features.
However, security depends on the complete window system, including the frame, glazing, locks and installation. Double glazing alone does not guarantee that a window cannot be forced open.
When choosing replacement windows, ask about the available security features and whether the specific products meet relevant security standards.
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8. What does uPVC mean?
uPVC stands for unplasticised polyvinyl chloride. It is a durable material widely used for windows and doors.
uPVC is popular because it is relatively low-maintenance, does not require routine painting and is available in a range of styles and finishes. It can also offer good thermal performance when combined with suitable glazing and correctly installed.
The best material for your home will depend on your budget, preferred appearance, maintenance requirements and the style of your property.
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9. Should I choose a composite door or a uPVC door?
Both can be suitable choices, depending on your priorities.
Composite doors typically use a combination of materials designed to provide a solid feel, insulation and a choice of decorative finishes. uPVC doors are often an economical, low-maintenance option and are available in a range of styles and colours.
The right choice depends on the design you prefer, the features you need, your budget and the specifications of the individual door.
We can explain the available options and help you choose a door that suits your home.
Explore our exterior doors to compare the available styles and options.
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10. What colour should I choose for my new front door?
There is a wide choice of colours and finishes, from traditional white and wood effects to contemporary greys, greens, blues and bolder colours.
Consider your property's appearance, your personal preferences and how much direct sunlight the door receives. Darker finishes can absorb more heat, so check the manufacturer's guidance for the particular door and finish.
For listed buildings and properties in conservation areas, restrictions may affect the proposed design, material or colour. Listed building consent is separate from planning permission and may be required. Check with your local planning authority before ordering if you are unsure.
We can help you explore the available colours and styles to find a door that suits your home.
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11. Can I see what new windows or doors will look like before I order?
Seeing how a new design might look on your home can make the decision much easier.
Where available, a photograph of your property can be used to create a visual mock-up showing different window styles, colours or door designs. This can help you compare options before making a final choice.
Ask us what visualisation options are available when discussing your project.
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12. Will new double glazing make my home warmer and quieter?
Modern double-glazed windows can help reduce heat loss and improve comfort compared with older or poorly performing windows.
They may also reduce outside noise, although the improvement depends on the glazing specification, the window design, the quality of the installation and the type of noise.
If energy efficiency or noise reduction is a priority, tell us when requesting a quotation so we can discuss suitable options.
Explore our double-glazed windows and discuss the right specification for your home.
Section 3: Installation, Costs & Guarantees
Learn what affects the cost of replacement windows and doors, what to expect during installation, and what you need to know about quotations, payment arrangements and guarantees.
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13. How much does it cost to replace windows or doors?
The cost depends on the number and size of the windows or doors, the frame material, glazing, opening style, colour and installation requirements.
When comparing quotations, check that they cover the same specification and work. Look for details of installation, removal of old frames, making good, guarantees and whether VAT is included where applicable.
We can assess your requirements and provide a written quotation explaining what is included. Tell us your priorities and budget so we can discuss suitable options.
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14. Do you offer free, no-obligation quotations?
We offer free quotations and home appointments. You can contact us to discuss your requirements and arrange the next step without committing to the work.
It's helpful to tell us which windows or doors you are considering replacing, whether you have any particular requirements and whether you are experiencing any existing problems.
See our contact page to get in touch.
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15. How long does it take to install new windows or doors?
Installation time depends on the number and type of windows or doors, access to the property and whether additional work is needed around the openings.
We will discuss the expected installation time when assessing your project and confirm the arrangements before work begins, including any preparation you need to make.
Manufacturing and delivery lead times are separate from the time spent fitting the products at your home.
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16. Will I need to redecorate after my new windows or doors are fitted?
Not necessarily, but some making good or redecoration may be needed depending on the condition of the existing openings and the type of replacement.
We take care during installation and aim to minimise disruption. However, removing old frames can sometimes affect plaster, paintwork, sealant or surrounding finishes.
If preserving existing decoration is particularly important to you, mention this when we assess the work so we can discuss what is realistically achievable.
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17. What guarantees do you provide for windows and doors?
Guarantees vary depending on the products, components and installation work included in your project.
Before you order, we will explain what is covered, how long each guarantee lasts and any exclusions or maintenance requirements. Cover for frames, sealed glass units, hardware and installation may differ.
Through our Consumer Protection Association membership, we can explain the insurance-backed guarantee arrangements available for qualifying work. This protection is subject to the policy terms and is intended to provide cover if the installer ceases trading.
Ask us to confirm the guarantees and insurance-backed protection included with your quotation.
You can also visit our accreditations page for more information.
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18. What payment methods do you accept?
We accept bank transfers and credit card payments. Please contact us if you would like to discuss payment arrangements for your project.
Your written quotation or contract will set out the agreed price, any deposit required, when payments are due and the applicable terms.
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19. What are your opening hours?
Our usual business hours are Monday to Friday, 9 am to 5 pm.
If we are unable to answer your call, please leave your name, telephone number and a brief message, and we will get back to you as soon as possible.
Section 4: Planning Permission & Building Regulations
Understand when planning permission or building regulations may apply to replacement windows and doors, including considerations for listed buildings and conservation areas.
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20. Do I need planning permission to replace my windows or doors?
In many cases, replacing existing windows or doors with similar designs does not require planning permission. However, restrictions may apply to listed buildings, properties in conservation areas and homes with specific planning conditions or restrictions on permitted development rights.
If you are considering a significant change to the appearance of your property, or you are unsure whether restrictions apply, check with your local planning authority before ordering.
You can start with the GOV.UK planning permission guidance.
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21. Do replacement windows and doors need to comply with building regulations?
Yes. Replacement windows and doors generally need to comply with the applicable Building Regulations in England, including relevant requirements for energy efficiency, ventilation and safety.
The work may be registered through an authorised competent person scheme, such as FENSA, where the installation and property meet the scheme's requirements. Alternatively, building control approval may be needed.
Ask your installer how compliance will be demonstrated and what documentation you will receive when the work is complete.
For further information, see the
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22. What is a FENSA certificate, and will I receive one?
FENSA is a government-authorised competent person scheme for qualifying replacement window and door installations in England and Wales.
We are a FENSA Approved Installer. For installations covered by the scheme, a FENSA certificate provides evidence that the registered work complies with the relevant Building Regulations. Keep it with your property records, as it may be requested when you sell your home.
Not every type of glazing work qualifies for FENSA certification. We will explain whether your project is covered and what documentation you should receive.
A FENSA certificate does not replace planning permission or listed building consent where either is required.
Visit our accreditations page or visit
FENSA website for more information.
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23. Can I replace windows in a listed building or conservation area?
Possibly, but additional restrictions may apply.
If your home is listed, replacing windows or doors may require listed building consent, particularly where the work affects its special architectural or historic character. In conservation areas, there may also be restrictions on the design, materials and appearance of replacement windows and doors.
Do not assume that replacing like-for-like means consent is unnecessary. Check the requirements with your local planning authority before arranging the work.
For properties in Suffolk towns and villages such as Sudbury, Long Melford and Lavenham, check whether your particular building is listed or lies within a conservation area. Requirements depend on the property and the proposed work, rather than the town name alone.
Where retaining the original windows is important, secondary glazing may be an option. Read our guidance on secondary glazing for listed buildings and conservation areas, including the permissions that may apply.
You can find further information in the GOV.UK guidance on the historic environment.
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24. Which council should I contact about planning permission?
You should contact the local planning authority responsible for your property's location. It can advise on planning permission, listed building consent and restrictions affecting your home.
For example, homeowners in the Sudbury area may need to consult Babergh District Council. Other customers across the wider service area may need a different council.
For building regulations, contact the relevant council's building control service if your proposed work is not being handled through an applicable competent person scheme.
The correct council depends on your property's address, so check the authority before submitting an application.
Section 5: Your Project & Next Steps
Discover how new windows and doors may benefit your home, what happens to your old frames and how to arrange a repair, replacement or no-obligation quotation with our team.
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25. Will new windows or doors add value to my home?
New windows and doors can improve your home's appearance, comfort, energy efficiency and kerb appeal. These improvements may make the property more attractive to potential buyers.
However, any effect on market value depends on the property, its location, the suitability and quality of the installation, and local buyer demand. There is no guaranteed percentage increase or assurance that the work will recover its full cost when you sell.
It is worth considering the benefits to your everyday comfort, security and enjoyment of your home alongside any potential resale value.
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26. Do you remove and dispose of my old windows and doors?
Yes, we remove the old windows and doors as part of the agreed replacement work and arrange responsible disposal. We also clear away installation waste and leave the working area tidy.
If you would like to keep any old frames, glass or fittings, please tell us before installation.
Your quotation will confirm what removal and disposal are included.
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27. How do I arrange a window or door repair or replacement?
Getting started is simple.
Contact us to discuss a repair, replacement or new installation. To help us advise you, please include:
- Your property’s postcode.
- A brief description of the problem or work you would like.
- How many windows or doors are involved.
- Photographs, if available.
- Your preferred timescale.
You do not need to know the technical terms or have exact measurements to make an initial enquiry. We can discuss the options and arrange a visit where needed.
Telephone: 01787 703662
Email: suffolkdoorsandwindows@gmail.com
Website: Contact Suffolk Doors & Windows
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28. Which areas do you cover for window and door installations and repairs?
Our service area includes Sudbury, Hadleigh, Ipswich, Bury St Edmunds and Stowmarket in Suffolk, and Colchester and Braintree in Essex, together with the towns and villages between and around these locations.
If you are unsure whether we cover your address, contact us with your postcode and a brief description of the work you need. We will be happy to confirm whether we can help.
Still Have a Question?
If you haven't found the answer you're looking for, we're happy to help.
Whether you need a window repair, replacement doors or windows, or advice on improving your home, get in touch with Suffolk Doors & Windows. Tell us a little about your project and we'll discuss the options available. You can also send an enquiry through our contact page.
