Instant
01 · Ask
Ask the AI a follow-up
Got more questions about lean-To Conservatory? Describe the bit you're unsure about — the AI explains options, sequencing and what to ask the conservatories.
Build a lean-to conservatory.
Single-pitch roof, mono-aspect — the most affordable conservatory style for narrow plots.
✓ Updated May 2026✓ Free quotes✓ Vetted pros
20,000+UK homeowners
50,000Quotes sent
Keep going
Hire a conservatory installer. Roof, regs, then quote.
You've read the brief on lean-To Conservatory. Now lean on us to find the right conservatories — and stay in control of the job.
Free
02 · Read the brief
Walk in informed
Costs, timelines, pitfalls and the right questions to ask before any conservatories starts on lean-To Conservatory.
60 seconds
03 · Compare
Compare 3 conservatories quotes
Itemised quotes from up to 3 local conservatoriess on lean-To Conservatory — so you can compare like-for-like, not lump sums.
✦
Get conservatories quotes Ready when you are
Enter your postcode and get free quotes from local pros.
Top tips
Hiring a conservatories, without the regret.
Four moves that separate a smooth job from a nightmare.
Low eaves restriction
Lean-to suits bungalows (where roof height is below the upstairs windows) but rarely 2-storey homes — the slope would have to be too shallow.
Pitch too shallow
A roof at 2.5° doesn't drain — water pools. Minimum 5° pitch for glass, 7° for polycarbonate.
Box gutter at the wall
The junction with the existing wall needs a properly detailed box gutter. Cheap installs use silicone — fails in 5 years.
Looks "lean-to" rather than premium
The simple geometry means less kerb appeal. Specify quality frames and brickwork to elevate the look.
Costs & timeline
Know what it costs. Know when it ends.
Indicative UK ranges and a typical week-by-week schedule.
Cost range
By job type
Inc. VAT · 2026
Source: NMT quotes
Source: NMT quotes
Small lean-to (2.5m × 3m)uPVC, polycarbonate roof
£5.5k–£10k
Medium lean-to (3m × 4m)uPVC, glass roof
£8.5k–£16k
Large lean-to (3.5m × 5m)Aluminium, premium glazing
£11k–£22k
Brick base + slabCombined
£1.8k–£5k
Underfloor heatingWet system
£1k–£3k
Tiled warm roof upgradeYear-round use
£3.5k–£9k
!
Quote spread is typically ± 18% — always get 3 quotes.
Timeline
Mid-size conservatory · week by week
Typical
5 phases · 5 wk
5 phases · 5 wk
W1
W2
W3
W4
W5
Foundations + dwarf wall
Frame + glazing
Roof + ridge
Electrics + flooring
Snags + handover
!
Schedule slips on dependencies — pad each phase by 10–20% for real-world delays.
At a glance
Infographic · VideoThe Conservatories briefing.
Infographic
Conservatories quick-view
Video guide
Conservatories explained
Lean-to conservatories are the simplest, cheapest, and best-suited to bungalows or terraced houses with low eaves. They have a single-sloped (mono-pitch) roof leaning from the house wall outward. Expect to pay £6,500–£18,000 fitted in the UK depending on size and specification.
What Does the Work Involve?
Same foundation requirement as Victorian/Edwardian: 200mm reinforced slab, brick dwarf wall, DPC tied into the house. The frame is the simplest of all conservatory types — front wall, two side walls, single-pitched roof tied into the house wall via a box gutter or lead flashing. Doors usually French or sliding at the front.
Typical Costs
| Item | Low (£) | High (£) | Notes |
|---|---|---|---|
| Small lean-to (2.5m × 3m) | 5,500 | 10,000 | uPVC, polycarbonate roof |
| Medium lean-to (3m × 4m) | 8,500 | 16,000 | uPVC, glass roof |
| Large lean-to (3.5m × 5m) | 11,000 | 22,000 | Aluminium, premium glazing |
| Brick base + slab | 1,800 | 5,000 | Combined |
| Underfloor heating | 1,000 | 3,000 | Wet system |
| Tiled warm roof upgrade | 3,500 | 9,000 | Year-round use |
How Long Does It Take?
3–4 weeks total. Slightly faster than Victorian/Edwardian because the roof is simpler.
DIY or Professional?
Professional. Same regulations apply — foundations, electrical, FENSA registration.
Choosing the Right Tradesperson
Same conservatory specialists — lean-to is their cheapest option, so check they're not corner-cutting. Insist on the same warranty and certification regardless of price.
UK Regulations
Same as other conservatories. Building Regs exempt under 30 m² with external doors. Permitted development for size limits.
Common Problems
- Low eaves restriction: Lean-to suits bungalows (where roof height is below the upstairs windows) but rarely 2-storey homes — the slope would have to be too shallow.
- Pitch too shallow: A roof at 2.5° doesn't drain — water pools. Minimum 5° pitch for glass, 7° for polycarbonate.
- Box gutter at the wall: The junction with the existing wall needs a properly detailed box gutter. Cheap installs use silicone — fails in 5 years.
- Looks "lean-to" rather than premium: The simple geometry means less kerb appeal. Specify quality frames and brickwork to elevate the look.
Frequently Asked Questions
Will a lean-to work on my house?
Best for bungalows or houses with single-storey extensions. Two-storey homes can take a lean-to only if there's a flat-roofed first-floor extension to lean against, or if the eaves are exceptionally low.
How cheap can a lean-to be?
Around £5,500 for the smallest spec (2.5m × 3m, polycarbonate roof, white uPVC). That's the cheapest entry to any conservatory style.
Can I have bi-fold doors on a lean-to?
Yes — many homeowners spec bi-folds or sliders at the front for the open-aspect feel. Adds £2,500–£6,000.
Why does a lean-to need a special box gutter?
The roof slope ends at the existing house wall. Where they meet, the water needs to drain into a box gutter that runs along the wall. Cheap installs skip this and the junction leaks.
Can I add a tiled roof later?
Yes — most lean-to frames take a tiled roof retrofit. Lightweight Roofing systems (Guardian, Ultraroof) are popular upgrades for £4,500–£9,000.
Is a lean-to suitable for year-round use?
Only with proper spec: glass roof, double-glazed walls, underfloor heating, ventilation. Cheap polycarbonate-roofed lean-tos are unusable 4–5 months per year.
This guide was written with AI assistance and is intended for general information only. Prices are estimates based on UK averages and may vary by region. Always get at least three quotes and consult a qualified professional before starting any work.
NEWAI Trade Assistant
Got more questions
about conservatories?
Ask follow-ups in plain English. The AI explains options, sequencing and what to ask the conservatories — so you walk in informed.
I'm planning a job. Should I be looking for a conservatories?
Sounds like a job for conservatories. Tell me what you're trying to do — I'll walk you through costs, timeline and what to ask before they start.
FREE QUOTES60 SECONDS
Keep reading
VIEW ALL CONSERVATORIES GUIDES →More conservatories guides.
Guide
Victorian Conservatory — UK Cost & Style Guide
Victorian conservatories are the multi-faceted bay-fronted classic. UK costs, planning, glazing and how the style suits period homes.
READ GUIDE →GuideEdwardian Conservatory — UK Cost & Style Guide
Edwardian conservatories are the rectangular box-shape classic. UK costs, comparison vs Victorian and where the style suits best.
READ GUIDE →GuideGable Conservatory — UK Cost & Style Guide
Gable conservatories have a tall feature front. UK costs, the dramatic apex aesthetic and where they suit best.
READ GUIDE →GuideP-Shape & L-Shape Conservatory — UK Cost & Layout Guide
P-shape and L-shape conservatories combine styles for maximum space. UK costs, layouts and which suits semi-detached homes.
READ GUIDE →GuideOrangery — UK Cost & Style Guide
Orangeries are the brick-pillared upgrade from a conservatory. UK costs, lantern roofs and how they bridge garden room and extension.
READ GUIDE →GuideLightweight Tiled Conservatory Roof — UK Cost & Guide
Lightweight tiled roofs convert a hot/cold conservatory into a year-round room. UK costs, brands and the warm-roof transformation.
READ GUIDE →