When I began planning my conservatory project, the first question I asked was straightforward: How long does it take to build a conservatory in the UK?

The short answer: most conservatories take between 3 to 6 weeks from construction start to completion. But depending on the style, permissions, and time of year, the timeline can vary.

In this guide, I’ll break down the most important factors that affect how long does it take to build a conservatory in the UK in 2025 really.

What Impacts the Build Time of a Conservatory in the UK?

While most estimates suggest 3–6 weeks, several key factors influence the actual build time.

1. Type and Style of Conservatory

Few styles of conservatory are faster to construct than others. Here’s a comparison of the most common types:

Conservatory Type	Typical Build Time (UK 2025)	Notes
Lean-to	2–3 weeks	Simplest design, minimal structure
Edwardian	3–5 weeks	Symmetrical design, standard complexity
Victorian	4–6 weeks	Curved frontage, more glazing involved
Orangery	6–8 weeks	Includes brickwork and bespoke features

The simpler the design, the faster the construction. If speed is your priority, a lean-to or Edwardian conservatory may be your best choice.

2. Foundations and Groundwork

Before the structure goes up, the groundwork must be laid. The ground word adds excavation, pouring foundations & laying a concrete base.

This phase typically takes 3 to 5 days, but weather and ground conditions can extend that.

If your garden is sloped or has poor drainage, it may take longer to complete this stage.

3. Planning Permission (When Required)

Many conservatories in the UK fall under Permitted Development Rights, which means planning permission is not needed.

However, you will definitely need formal permission if your conservatory:

• Exceeds size limits (e.g. extends more than 6 metres for a semi-detached home)
  
• Is being added to a listed property
  
• Is located near a road or boundary line
  

If required, planning permission can take 6 to 8 weeks to obtain. It’s best to clarify this with your local authority before committing to a build date.

4. Construction Timeline

Once construction begins, the build is usually completed in phases. Here’s a simplified overview:

• Week 1: Groundworks and base installation
  
• Week 2: Frame construction and wall panels
  
• Week 3: Roof and glazing installation
  
• Week 4 and beyond: Flooring, electrics, plastering, and final inspection
  

Some companies offer modular or pre-fabricated conservatories, which are assembled off-site and installed quickly. These systems can reduce on-site build time by up to 30 percent.

5. Time of Year and Weather Conditions

The British weather is a major factor in any home improvement project. Rain, frost, or snow can delay groundwork and roofing stages, particularly during autumn and winter.

For the best chance of staying on schedule, consider planning your build for spring or early summer.

Longer daylight hours and drier conditions can keep your project moving without weather-related hold-ups.

6. Contractor Availability and Scheduling

Contractors often get booked up months in advance, especially during spring and summer. If you’re working with a high-demand installer, your start date may be delayed.

To minimise wait time:

• Plan at least three to six months ahead
  
• Work with a reputable local installer who has availability
  
• Ensure all designs, materials, and paperwork are finalised before booking
  

How Long Does It Really Take to Build a Conservatory in the UK?

To sum it up clearly:

• Straightforward builds with no permissions: 3 to 4 weeks
  
• Complex designs or custom features: 4 to 6 weeks
  
• Builds requiring planning permission or facing weather delays: 6 to 8+ weeks
  

From my own experience, careful planning made all the difference. My build took just under five weeks and followed a steady schedule, thanks to choosing the right season and keeping in close communication with the contractor.

Checklist to Keep Your Conservatory Build on Schedule

• Confirm whether planning permission is needed
  
• Choose a simple or modular design if speed matters
  
• Order materials early, especially glazing and roofing for tiled conservatory 
  
• Plan the build for spring or early summer
  
• Work with an experienced, local contractor
  

Final Thoughts

If you’re wondering how long does it take to build a conservatory in the UK, the average is between 3 to 6 weeks, but your specific project may vary based on style, permissions, and weather.

The key to keeping your timeline tight is preparation. Whether you’re building a bright garden room or a warm home office extension, knowing what to expect means fewer surprises and a smoother experience from start to finish.

Need help choosing the right conservatory style or builder? I’d be happy to share more tips based on what I learned during my own project.

FAQ on How long does it take to build a conservatory

1. Does the size of a conservatory affect the build time?

Yes, larger conservatories usually take longer to build due to the increased foundation work, more glazing, and extended finishing requirements.

A small lean-to may be completed in under three weeks, while a large orangery could take up to eight weeks or more.

2. How long does it take to get a conservatory quote and design finalised?

Most companies can provide an initial quote within a few days.

Finalising the design, especially if it’s bespoke, can take 1–2 weeks depending on how many revisions are needed and how quickly decisions are made.

3. Is it quicker to build a conservatory on a new build or older property?

Newer properties often make for quicker builds as the ground conditions and structure are more predictable.

Older homes may need more groundwork or structural checks, which can extend the timeline.

4. Can I build a conservatory during the winter in the UK?

You can, but it’s not ideal. Cold weather, frost, and shorter daylight hours can delay groundwork and roofing. Builders may also have limited availability during winter holidays, so expect possible delays.

5. How long after the build can I start using my conservatory?

You can usually start using your conservatory immediately after the final sign-off.

However, if you plan to install flooring, blinds, or heating, it may take an additional few days to finish interior touches before it’s fully functional.

6. Does choosing underfloor heating or electrics add to the build time?

Yes, including features like underfloor heating, lighting, or integrated electrics can add a few extra days to the timeline — especially if you need electrical certification from a qualified professional.

7. Is it possible to fast-track a conservatory build?

Some companies offer express build packages or modular conservatory systems that can reduce on-site construction time significantly.

These may come at a premium cost but can shorten your build to under three weeks.

8. How long does it take to remove an old conservatory before building a new one?

Demolition of an old conservatory typically takes 1 to 3 days, depending on the materials and size. If a new base or foundation is needed, factor in extra time before the rebuild begins.