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Build a Victorian conservatory.
Bay-fronted, multi-faceted — the most recognisable conservatory style, with ornate detailing.
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Costs, timelines, pitfalls and the right questions to ask before any conservatories starts on victorian Conservatory.
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Top tips
Hiring a conservatories, without the regret.
Four moves that separate a smooth job from a nightmare.
Cold in winter, hot in summer
Single-glazed polycarbonate roofs are unbearable. Specify SGG self-cleaning glass with solar coating, or upgrade to a tiled lightweight roof.
Condensation
Inadequate ventilation gives condensation issues. Trickle vents in the frames and a roof vent are essential.
Foundations too shallow
Building Regs exempt doesn't mean foundation-free. 600mm depth minimum into firm subsoil.
Wrong door arrangement
A conservatory with both front and side French doors gives flexibility but cuts the wall space for radiators/storage.
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
3-facet Victorian small (3m × 3m)uPVC frames, polycarbonate roof
£10k–£18k
5-facet Victorian medium (3.5m × 4m)uPVC, glass roof
£14k–£26k
7-facet Victorian large (4m × 5m)Aluminium frames, glass roof
£20k–£40k
Brick base (dwarf wall to cill)Foundations and brick
£1.5k–£4.5k
Concrete slabReinforced, insulated
£800–£2.5k
Underfloor heatingWet system + boiler tie-in
£1.2k–£3.5k
!
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.
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Video guide
Conservatories explained
Victorian conservatories are the multi-faceted bay-fronted classic — 3, 5 or 7 facets at the front (rounded), gable or shallow-pitch roof, sash or French doors. They suit traditional Victorian, Edwardian and modern brick homes equally well. Expect to pay £12,000–£35,000 fitted in the UK depending on size, glazing and base build.
What Does the Work Involve?
The work starts with the base — a 200mm reinforced concrete slab with insulated DPM, supporting a brick dwarf wall up to cill height. The frame goes up: ridge, hipped rafters meeting at the apex, glazed walls with French doors at the rear. The roof is glazed (polycarbonate or self-cleaning glass) or tiled (lightweight Roofing for warm-roof option). Internal floor is tiled or LVT; underfloor heating is the modern default.
Typical Costs
| Item | Low (£) | High (£) | Notes |
|---|---|---|---|
| 3-facet Victorian small (3m × 3m) | 10,000 | 18,000 | uPVC frames, polycarbonate roof |
| 5-facet Victorian medium (3.5m × 4m) | 14,000 | 26,000 | uPVC, glass roof |
| 7-facet Victorian large (4m × 5m) | 20,000 | 40,000 | Aluminium frames, glass roof |
| Brick base (dwarf wall to cill) | 1,500 | 4,500 | Foundations and brick |
| Concrete slab | 800 | 2,500 | Reinforced, insulated |
| Underfloor heating | 1,200 | 3,500 | Wet system + boiler tie-in |
| Lightweight tiled roof upgrade | 4,500 | 12,000 | Vs glazed roof |
How Long Does It Take?
Typical Victorian build: 4–6 weeks total. Base prep takes 1–2 weeks (foundations, brickwork, DPC, slab); frame and glazing erection 1 week; roof and trims 1 week; internal finishes (floor, electrics, plastering) 1–2 weeks.
DIY or Professional?
Professional only. The foundations need to follow Approved Document Part A (structure), the electrical work needs Part P certification, the build itself needs FENSA/Certass registration. A bad foundation cracks the brick base within 2 years.
Choosing the Right Tradesperson
Use a conservatory specialist or recommended local installer — Anglian, Everest, Eurocell, Liniar are the big UK brand names. Confirm FENSA or Certass registration, 10-year insurance-backed warranty (IBG), and DGCOS membership. Get the brand of frame system in writing.
UK Regulations
Conservatories under 30 m² and separated from the dwelling by external-grade doors are exempt from Building Regs. Above that or open-plan to the house — full compliance needed. Planning permission usually not needed for a conservatory under permitted-development limits (3m depth rear extension, 4m for detached homes). Listed buildings need consent. Conservation areas have stricter rules.
Common Problems
- Cold in winter, hot in summer: Single-glazed polycarbonate roofs are unbearable. Specify SGG self-cleaning glass with solar coating, or upgrade to a tiled lightweight roof.
- Condensation: Inadequate ventilation gives condensation issues. Trickle vents in the frames and a roof vent are essential.
- Foundations too shallow: Building Regs exempt doesn't mean foundation-free. 600mm depth minimum into firm subsoil.
- Wrong door arrangement: A conservatory with both front and side French doors gives flexibility but cuts the wall space for radiators/storage.
Frequently Asked Questions
Do I need planning permission?
Usually not — conservatories under permitted development limits (rear extension up to 3m depth for terraced/semi, 4m for detached) don't need planning. Listed buildings and conservation areas usually do.
Are conservatories Building Regs exempt?
Yes if under 30 m² and separated from the house by external-grade doors. Modern open-plan layouts that lose the internal doors lose the exemption.
Glass or polycarbonate roof?
Glass — always. Modern self-cleaning solar-control glass massively outperforms polycarbonate on heat, noise and longevity. Polycarbonate is dated and limits resale value.
Can I use it year-round?
With proper specification — self-cleaning glass roof, double-glazed walls, underfloor heating, ventilation — yes, year-round. Cheap polycarbonate-roofed conservatories are unusable for 4–5 months per year.
How long does a Victorian conservatory last?
uPVC frames: 20–30 years. Aluminium: 40+. Brick base: 80+ years. Glass: 25+ years. Polycarbonate roof: 15–20 years.
Will it add value to my house?
Quality builds add 5–10% to property value typically. Cheap builds with polycarbonate roofs can actually deter buyers — many surveyors flag them as future replacement costs.
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.
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