Can I Remove the Doors Between My House and Conservatory?
Complete guide to creating seamless open-plan living by removing the separation between your home and glass extension. Building Regulations, structural requirements, and thermal efficiency explained.
Quick Answer: Can You Remove Conservatory Doors?
Yes, you can legally remove the doors between your house and conservatory in the UK. However, Building Regulations approval is mandatory because conservatories are only exempt from thermal standards when physically separated from the main dwelling. Once you remove the doors, your conservatory must meet Part L energy efficiency requirements, typically requiring glazing U-values of 1.4 W/m²K or better for walls and 1.0 W/m²K or better for roofs.
Key facts: No planning permission required. Building Regulations approval required. Typical costs range from £1,500 for basic door removal to £15,000+ if glazing upgrades or structural work are needed. Timeline: 2-12 weeks depending on scope. Failure to obtain approval can cause problems when selling your property, invalidate home insurance, and potentially require reinstatement of the doors.
Key Facts: Removing Conservatory Doors (UK 2026)
- Legal requirement: Building Regulations approval is mandatory; planning permission is not required
- Relevant regulations: Part L (Conservation of Fuel and Power) and Part A (Structure)
- Thermal standards: Wall glazing ≤1.4 W/m²K; roof glazing ≤1.0 W/m²K
- Cost range: £1,500-£3,000 (basic), £3,000-£8,000 (structural), £5,000-£15,000+ (glazing upgrades)
- Timeline: 2-4 weeks simple; 6-12 weeks with upgrades
- Why doors exist: Conservatories are exempt from Building Regulations only when thermally separated
- Structural consideration: Most external walls are load-bearing; widening requires a steel beam (RSJ)
- Completion certificate: Required for future property sales and insurance
Why Are Doors Required in the First Place?
To understand the requirements for removing doors, it helps to know why they’re typically installed. When conservatories are built, they often benefit from an exemption in the Building Regulations. This exemption allows them to be constructed without meeting the same stringent energy efficiency requirements as the main house, but only if they remain thermally separated from the living space.
The separation is achieved through external-quality doors or windows between the conservatory and the house. These act as a thermal barrier, preventing heat from the main house escaping into the less efficient conservatory space.
The Building Regulations Exemption
According to the Planning Portal, conservatories are exempt from Building Regulations if they meet specific criteria, including being separated from the main house by external-quality doors or windows.
However, modern glass technology has changed this equation dramatically. High-performance glazing can now achieve thermal efficiency comparable to solid walls, making the separation less necessary.
The key point is this: the doors are a regulatory requirement, not a structural one. They exist to maintain energy efficiency standards for your home. If you can demonstrate that your conservatory meets adequate thermal standards without the doors, Building Control will approve their removal.
Key Terms and Definitions
Understanding the terminology helps homeowners navigate the process and communicate effectively with contractors and Building Control.
What is a U-value?
Definition: A U-value (thermal transmittance) measures how effective a material is as an insulator. It represents the rate of heat transfer through a structure, measured in watts per square metre kelvin (W/m²K). Lower U-values indicate better insulation.
What are Building Regulations Part L and Part A?
Part L (Conservation of Fuel and Power) sets standards for energy efficiency in buildings. When removing conservatory doors, Part L requires your conservatory to meet specific thermal standards.
Part A (Structure) ensures building work is structurally safe. It applies if you’re modifying load-bearing walls.
What is a load-bearing wall?
Definition: A load-bearing wall transfers weight from above down to the foundation. Most external walls in UK homes are load-bearing. Removing or modifying them requires proper structural support, typically a steel beam (RSJ).
What is Building Regulations approval?
Definition: Building Regulations approval is official confirmation from your local Building Control department that proposed work complies with national building standards. It differs from planning permission.
Do You Need Planning Permission or Building Regulations Approval?
Planning Permission
No, you typically do not need planning permission to remove the doors between your house and conservatory. Planning permission relates to external changes.
Most conservatories and orangeries don’t require planning permission if they fall within Permitted Development rights.
Building Regulations Approval
Yes, you will need Building Regulations approval to remove the doors. This is because you’re fundamentally changing how your home manages heat and energy.
Important: Don’t Skip Building Regulations
Some homeowners simply remove the doors without seeking approval. This is risky:
- You may face enforcement action requiring the doors to be reinstated
- When selling your property, solicitors will check for compliance
- Your home insurance may be invalidated
- Future buyers may require a significant price reduction or indemnity insurance
The approval process is straightforward and relatively inexpensive. It’s always worth doing properly.
What Building Regulations Apply When Removing Conservatory Doors?
Part L: Conservation of Fuel and Power
This is the primary regulation. The key requirements include:
- Glazing U-values: Wall and door glazing should achieve 1.4 W/m²K or better. Roof glazing should achieve 1.0 W/m²K or better.
- Overall thermal performance: Combined heat loss should not significantly increase your home’s energy consumption.
- Heating provision: Adequate heating must be available in the conservatory space.
Meeting these requirements is easier than ever with modern glass technology. New Generation Glass achieves U-values under 1.0 W/m²K while blocking up to 86% of solar heat.
Part A: Structure
If you plan to widen the opening or remove sections of wall, Part A applies. Most external walls are load-bearing, requiring proper structural support.
Is the External Wall Load-Bearing?
How to Identify a Load-Bearing Wall
Most external walls in UK homes are load-bearing. Signs include:
- The wall runs perpendicular to floor or ceiling joists
- There are walls or structural elements directly above
- The wall is thick (typically 225mm or more)
- Removing it would leave an unsupported span
Always have a structural engineer assess your specific situation before planning any work.
What If You Want to Widen the Opening?
Widening the opening typically involves:
- Structural calculations by a qualified engineer
- Installation of a steel beam (RSJ) or concrete lintel
- Temporary support (acrow props) during the work
- Building Regulations approval and inspection
- Making good the opening with appropriate finishes
The Benefits of Widening
While widening adds cost, the results can be transformative. A wider opening creates a true sense of one continuous space.
Will Removing the Doors Make My House Cold?
The Problem with Older Conservatories
Traditional conservatories built 15-20+ years ago often have poor thermal performance. Single glazing, polycarbonate roofs, and minimal insulation mean they lose heat rapidly.
The Solution: High-Performance Glazing
New Generation Glass used in Room Outside installations achieves remarkable thermal performance:
- U-values under 1.0 W/m²K – comparable to solid insulated walls
- 86% solar heat rejection – prevents summer overheating
- 70%+ light transmission – maintains the bright, airy feel
- 99% UV protection – protects furnishings from fading
Upgrade to High-Performance Glass
Consider a glass upgrade before removing doors.
Extend Central Heating
Ensure adequate heating is available in the conservatory.
Consider Roof Insulation
Upgrade polycarbonate or glass roof with poor U-values.
Address Draughts
Check seals around windows and doors.
Step-by-Step Process for Removing Conservatory Doors
Assess Current Thermal Performance
Evaluate your conservatory’s glazing, roof, and insulation. Check U-values against Building Regulations requirements.
Check Structural Requirements
Determine if you want to simply remove existing doors or widen the opening. If widening, arrange a structural engineer’s assessment.
Plan Any Glazing Upgrades
If older glazing won’t meet Building Regulations, plan upgrades to high-performance glass.
Submit Building Regulations Application
Submit plans and calculations to your local Building Control department. Allow 2-4 weeks for approval.
Complete Glazing Upgrades (If Required)
Install any new glazing before removing doors.
Complete Structural Work (If Widening)
Install structural support (steel beam) before removing any masonry.
Remove Doors and Finish Opening
Remove the existing doors and frame. Make good the opening.
Obtain Building Regulations Sign-Off
Arrange final inspection from Building Control. Keep the completion certificate safe.
How Much Does It Cost to Remove Conservatory Doors?
| Work Required | Typical Cost Range | Notes |
|---|---|---|
| Basic door removal only | £500-£1,500 | Existing glazing meets standards |
| Door removal + Building Regs | £1,500-£3,000 | Including application fees |
| Opening widening (structural) | £3,000-£8,000 | Steel beam, structural engineer |
| Glazing upgrade | £5,000-£15,000+ | Depends on size and specification |
| Complete project (all elements) | £8,000-£25,000+ | Full upgrade including everything |
These costs represent typical ranges for the South East. Actual costs depend on your specific circumstances, conservatory size, accessibility, and chosen specifications. For detailed pricing on specific extension types, see our orangery price guide and glass extension price guide.
Is the Investment Worth It?
For many homeowners, the answer is absolutely yes. Creating seamless open-plan living transforms how you use your space, increases natural light throughout your home, and can add significant value to your property. The investment typically delivers both immediate lifestyle benefits and long-term financial returns when you sell. Get a free quote to understand the costs for your specific project.
UK Statistics: Conservatories and Building Regulations
Industry Data and Research Findings
- UK conservatories: Approximately 3-4 million UK homes have conservatories
- Annual installations: Around 50,000-100,000 new conservatories each year
- Property value impact: Well-integrated conservatories can add 5-10% to property values
- Energy efficiency: Modern heat-control glass reduces solar heat gain by up to 86%
- U-value comparison: Standard double glazing: 2.8-3.0; Modern: 1.2-1.6; High-performance: 0.8-1.0 W/m²K
Why These Numbers Matter
The gap between standard and high-performance glazing is significant. A conservatory with standard double glazing (U-value 2.8 W/m²K) loses heat nearly three times faster than one with high-performance glass (U-value 1.0 W/m²K).
Alternatives to Complete Door Removal
Bi-Fold or Sliding Doors
Replace existing doors with wide bi-fold or sliding doors that can be fully opened while providing thermal separation when closed.
Internal Glazed Screens
Install floor-to-ceiling internal glazed screens that maintain the visual connection while providing thermal separation.
Partial Opening
Widen the existing opening and install minimal framing rather than complete removal.
Common Misconceptions About Removing Conservatory Doors
Myth #1: “You need planning permission to remove conservatory doors”
Fact: Planning permission is NOT required. Building Regulations approval IS required.
Myth #2: “You can just remove the doors without any approvals”
Fact: Doing so without Building Regulations approval is illegal and can cause serious problems.
Myth #3: “Modern conservatories don’t need separating doors”
Fact: The requirement depends on thermal performance at the time of construction, not age.
Myth #4: “Removing conservatory doors will always make your house cold”
Fact: With modern high-performance glazing (U-values under 1.0 W/m²K), conservatories can be as thermally efficient as the rest of your home.
Myth #5: “Building Regulations approval is expensive and complicated”
Fact: Applications typically cost £200-£500. Most are approved within 2-4 weeks.
Summary: Key Takeaways for Homeowners
The Bottom Line
- Yes, you can remove the doors – but Building Regulations approval is mandatory
- No planning permission needed – this is an internal modification only
- Thermal efficiency is key – your conservatory must meet Part L standards
- Structural assessment may be needed – especially if widening the opening
- Costs range from £1,500 to £15,000+ – depending on scope
- Timeline is 2-12 weeks – simple removal is quick; complex projects take longer
- Always get a completion certificate – essential for future property sales
- Modern glass technology makes compliance easy – high-performance glazing exceeds minimum requirements
- Ready to start? – get a free quote for your conservatory integration project
The benefits of removing conservatory doors include creating seamless open-plan living, increasing natural light throughout your home, improving the sense of space, and potentially adding value to your property.
Regional Considerations: Kent, Surrey, Sussex & London
Kent Homeowners (Sevenoaks, Canterbury, Maidstone, Tunbridge Wells)
Many Kent properties are located in Conservation Areas or Areas of Outstanding Natural Beauty. While removing internal doors doesn’t require planning permission, any external modifications may need consent.
Surrey Homeowners (Guildford, Woking, Epsom, Reigate)
Surrey properties often have larger conservatories, making thermal efficiency particularly important. Homeowners benefit significantly from high-performance glazing upgrades before door removal.
Sussex Homeowners (Brighton, Chichester, Worthing, Eastbourne)
Coastal properties in East Sussex and West Sussex face unique thermal challenges. Salt air, strong winds, and intense sunlight require careful consideration.
London & Hampshire Homeowners
Greater London properties often have space constraints that make open-plan living especially valuable. Similarly, Hampshire homeowners increasingly seek seamless connections to their garden rooms.
Local Building Control Contacts
We work with Building Control departments across all our service areas and can manage the approval process on your behalf.
Getting Expert Advice for Your Project
Every property is different. At Room Outside, we’ve helped hundreds of homeowners across Kent, Surrey, Sussex, and London create seamless connections between their homes and glass extensions.
Our design and consultation process includes assessment of your existing structure, recommendations for thermal improvements, and guidance on Building Regulations compliance. Whether you’re planning a new glass room, orangery, luxury conservatory, or looking to upgrade an existing structure, we can help.
We also offer glass upgrade services that can transform older conservatories with high-performance New Generation Glass, making door removal practical even for properties with existing dated structures.
Areas We Cover Across the South East
Room Outside provides conservatory door removal, glass upgrades, and Building Regulations consultation across the South East.
Counties We Serve:
Key Towns & Cities:
Not sure if we cover your area? Check our full service area map or call 01243 538999.
Questions about removing conservatory doors? Contact us online or call 01243 538999 – David our digital assistant will take a few details so the right specialist can follow up personally.
Sources, References, and Further Reading
Official Government Sources: UK Planning Portal – Building Regulations for Conservatories; HM Government Approved Document L; Approved Document A; Building Regulations 2010 (as amended).
Industry Bodies: Glass and Glazing Federation (GGF); Federation of Master Builders (FMB); British Fenestration Rating Council (BFRC).
Technical Standards: BS EN 673:2011; BS EN ISO 10077-1.
Industry Experience: Room Outside – 50+ years of conservatory design and installation (established 1973).
About This Guide
This guide was created by Room Outside, specialists in conservatories, orangeries, and glass extensions since 1973. With over 50 years of experience across the South East, we have extensive practical knowledge of Building Regulations compliance and thermal efficiency requirements.
Last updated: April 2026 | Reviewed for accuracy: Building Regulations requirements verified against current Approved Documents
Frequently Asked Questions About Removing Conservatory Doors
Can I remove the doors between my house and conservatory in the UK?
Yes, you can remove the doors between your house and conservatory in the UK, but you need Building Regulations approval first. This approval confirms your conservatory meets thermal efficiency standards (typically U-values under 1.4 W/m²K for glazing). Call 01243 538999 – David our digital assistant will take a few details so the right specialist can follow up personally.
Do I need planning permission to remove conservatory doors?
No, you do not need planning permission. This is an internal modification. However, you do need Building Regulations approval. This applies whether you’re in Sevenoaks, Guildford, Brighton, or anywhere else in England.
What Building Regulations apply when removing conservatory doors?
Part L (Conservation of Fuel and Power) is the main regulation. Part A (Structure) applies if modifying load-bearing walls. Your conservatory needs glazing U-values of 1.4 W/m²K or better for walls/doors and 1.0 W/m²K or better for roof.
How much does it cost to remove doors between house and conservatory?
Costs range from £1,500 to £15,000+ depending on work required. Basic door removal: £1,500-£3,000. Opening widening: £3,000-£8,000. Glazing upgrades: £5,000-£15,000+. Complete project: £8,000-£25,000+. Contact Room Outside for a free, no-obligation quote.
Will removing conservatory doors make my house cold?
Only if your conservatory has poor thermal performance. Modern high-performance glass like New Generation Glass (U-values under 1.0 W/m²K) keeps spaces comfortable year-round, blocking 86% of solar heat in summer while retaining warmth in winter.
Is the wall between my house and conservatory load-bearing?
Most external walls are load-bearing, supporting floor joists or roof rafters. If you want to widen the opening, a structural engineer must assess and specify support (usually a steel beam/RSJ). Building Regs approval is required.
Can I widen the opening when removing conservatory doors?
Yes, you can often widen the opening for a more dramatic open-plan effect. This requires structural calculations, steel beam installation, and Building Regulations approval.
What U-value does my conservatory glass need to meet Building Regs?
Wall/door glazing needs 1.4 W/m²K or better. Roof glazing needs 1.0 W/m²K or better. New Generation Glass achieves U-values under 1.0 W/m²K throughout.
How long does conservatory door removal take?
Simple door removal takes 2-4 weeks including Building Regs approval. If glazing upgrades or structural work are required, allow 6-12 weeks.
Do I need a completion certificate for removing conservatory doors?
Yes, you should obtain a Building Regulations completion certificate once work is finished and inspected. It’s essential for future property sales.
Who can help with conservatory door removal in Kent, Surrey, or Sussex?
Room Outside specialises in conservatory integration projects across Kent, Surrey, Sussex, Hampshire, and London. Based in Chichester, West Sussex, we’ve served the South East since 1973. Call 01243 538999 – David our digital assistant will take a few details so the right specialist can follow up personally.
Can I remove conservatory doors myself (DIY)?
Physically removing doors is straightforward, but Building Regs compliance is essential. Without approval, you risk enforcement action, insurance issues, and problems when selling. DIY removal without approval is not recommended.
01243 538999 – Call us anytime – David our digital assistant will take a few details so the right specialist can follow up personally.
Create Seamless Open-Plan Living
Whether you’re planning a new glass extension or looking to integrate your existing conservatory, our team can help you create the seamless connection you’re looking for.
Call us anytime – David our digital assistant will take a few details so the right specialist can follow up personally.
Room Outside: Creating beautiful glass extensions since 1973.
Serving West Sussex, Surrey, Kent, Essex, Hampshire, Dorset, Berkshire, Greater London & East Sussex.
