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.
Many homeowners love the light their conservatory brings but dislike the sense that it is separate from the main house. Removing the doors can create a brighter, more useful open-plan space, especially when linking a kitchen, dining room or living room to a glass extension. The important point is that this is not just a decorating decision. Once the physical separation is removed, the conservatory becomes part of the heated home and must satisfy Building Regulations.
Do You Need Planning Permission?
In most cases, you do not need planning permission simply to remove doors between your house and conservatory. The work is normally treated as an internal alteration. This is separate from Building Regulations, which are still required when the conservatory stops being thermally separated from the main dwelling.
Planning Permission vs Building Regulations
Planning permission controls whether development is acceptable in planning terms. Building Regulations control safety, structure, insulation, ventilation and energy performance. Door removal usually does not need planning permission, but it does need Building Regulations approval.
Why Building Regulations Approval Is Required
Conservatories are often exempt from some Building Regulations only when they are separated from the main house by external-quality doors and have independent heating controls. Removing those doors changes the status of the space. The conservatory becomes part of the main thermal envelope of the home.
This means Building Control will usually want to see that the enlarged space will not suffer excessive heat loss, condensation risk or overheating. The main regulations likely to matter are Part L for energy efficiency and Part A for structure if the opening is being widened.
- Part L: thermal performance, insulation, glazing and energy efficiency.
- Part A: structural safety if masonry, lintels or load-bearing walls are changed.
- Part F: ventilation if the new layout affects airflow.
- Part K: safety around glazing, thresholds and changes in level.
What U-Values Do You Need?
U-values measure heat loss. The lower the number, the better the insulation. When a conservatory is opened into the main house, Building Control will normally expect the glazing and roof to perform much more like the rest of the home.
Is the Wall Between the House and Conservatory Load-Bearing?
Often, yes. The wall between the original house and conservatory was usually an external wall before the conservatory was added. External walls commonly carry floor joists, roof loads or masonry above. If you only remove doors from an existing opening, structural work may be limited. If you want to widen the opening, remove brickwork or create a dramatic open-plan connection, a structural engineer should assess the wall.
Do Not Remove Masonry Without Structural Advice
If you are widening the opening, Building Control may require structural calculations and a suitable steel beam or lintel. This is especially important where there is a first floor, roof load or chimney breast nearby.
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, old frames and minimal insulation mean they can lose heat rapidly in winter and overheat in summer.
The Solution: High-Performance Glazing
New Generation Glass used in Room Outside installations achieves strong thermal performance:
- U-values under 1.0 W/m²K – comparable to well-insulated building elements.
- 86% solar heat rejection – helps prevent 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 Carefully
Ensure adequate heating is available in the conservatory and that controls comply with Building Regulations expectations.
Free Download
Considering a glass upgrade?
Our glass technology brochure covers solar control, U-values, UV protection and retrofit options – everything you need to understand before removing conservatory 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 will not 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 so the completed space performs as required.
Complete Structural Work If Widening
Install structural support before removing masonry, following the engineer’s specification.
Remove Doors and Finish Opening
Remove the existing doors and frame, then make good the reveals, floor finish and decoration.
Obtain Building Regulations Sign-Off
Arrange final inspection from Building Control and keep the completion certificate safe.
How Much Does It Cost?
The total cost depends on whether you are simply removing doors, upgrading glazing, widening the opening or combining all three. The table below gives typical UK budget ranges.
| Project Scope | Typical Cost | What Is Included |
|---|---|---|
| Basic door removal | £1,500-£3,000 | Door and frame removal, making good, basic Building Control process. |
| Opening widened | £3,000-£8,000 | Structural engineer, steel beam or lintel, masonry removal and finishing. |
| Glazing upgrade | £5,000-£15,000+ | Replacement roof or side glazing to improve year-round comfort. |
| Complete integration project | £8,000-£25,000+ | Thermal upgrades, structural changes, heating, flooring, electrics and finishing. |
Common Mistakes to Avoid
- Assuming it is only an internal job: Building Regulations still apply when the thermal separation is removed.
- Removing doors before checking U-values: older conservatories often need glazing or roof upgrades first.
- Widening the opening without calculations: this can create serious structural risk.
- Skipping the completion certificate: missing paperwork can cause problems during a future sale.
- Ignoring summer overheating: thermal performance is about comfort in both winter and summer.
Alternatives to Fully Removing the Doors
If full integration is not realistic, there are other ways to improve the connection between house and conservatory while retaining a degree of separation.
- Replace existing doors with wider sliding or bifold doors.
- Install better-insulated external-quality doors between the spaces.
- Upgrade the conservatory roof and glazing first, then revisit door removal.
- Create a wider glazed opening while keeping compliant separation.
Areas Room Outside Covers
Room Outside works with homeowners across the South East, including Kent, Surrey, Sussex, Hampshire and London.
Summary: Can You Remove the Doors?
Yes, you can remove the doors between your house and conservatory, but you should not do it casually. The key requirement is Building Regulations approval, mainly because the conservatory will become part of the heated living space. If the glazing, roof and structure are suitable, the result can be a brighter, more useful open-plan living area.
For older conservatories, the best route is usually to assess the thermal performance first, plan any glass or roof upgrades, confirm whether structural changes are needed, and then apply for Building Regulations approval before removing the doors.
Reviewed by a long-established conservatory specialist
Room Outside has designed and upgraded conservatories, orangeries and glass extensions since 1973. For projects involving door removal, the key checks are Building Regulations approval, thermal performance and whether any opening changes affect structure.
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 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 but you need Building Regulations approval. Call 01243 538999 for guidance.
Do I need planning permission to remove conservatory doors?
No, this is normally an internal alteration. Building Regulations approval is the key requirement.
How much does it cost to remove conservatory doors?
Costs typically range from £1,500 to £15,000+ depending on whether you need glazing upgrades, structural work or both.
Will removing the doors make my house cold?
Only if your conservatory has poor thermal performance. Modern high-performance glass keeps spaces more comfortable throughout the year.
Do I need a completion certificate?
Yes. A Building Regulations completion certificate is important for future property sales, insurance and proof of compliance.
Can I widen the opening at the same time?
Often yes, but you will usually need structural calculations and Building Control approval before removing masonry.
01243 538999 – Call us anytime – David our digital assistant will take a few details so the right specialist can follow up personally.
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