Home Extension & Conservatory Roof Replacement Costs
How much does a modular extension cost?
Upgrading an older conservatory or adding extra living space with a modern HUP extension is one of the most effective ways to improve comfort, insulation, and year-round usability.
Naturally, one of the first questions homeowners ask is How much does it cost?
Quick answer: HUP extensions typically range from £2,300–£3,000 per m², depending on layout, glazing choices, structure, and internal finish. As a guide:
- Small HUP extension (approx. 3m × 3m): £20,700 – £27,000+
- Medium HUP extension (approx. 4m × 4m): £36,800 – £48,000+
- Large HUP extension (approx. 4m × 6m): £55,200 – £75,000+
Your exact cost depends on measurements, condition, insulation level, and whether reinforcement is needed.
This guide provides transparent 2025 pricing for:
- HUP extension pricing
- Replacement conservatory roof pricing
- What affects the cost
- What’s included in every build
If you’re still exploring your options, our conservatory roof replacement page explains the systems we install and how each one performs.
What Affects the Cost of a HUP Extension or Replacement Roof?
Both extensions and modern insulated roofs are bespoke solutions, and pricing varies depending on:
- Size and shape of the space
- Existing structure condition
- Insulation level and internal finishes
- Whether reinforcement is required
- Skylights, lighting, decorative features
- Access and installation complexity
- Your chosen HUP layout or configuration
For some homeowners, planning rules can also play an indirect role in the project. While most conservatory roof replacements do not require planning permission, certain homes, extensions, or properties in restricted areas may require additional permissions.
If you’re unsure whether this applies to your project, our guide Do You Need Planning Permission to Change a Conservatory Roof? explains the rules clearly and helps you understand what’s relevant to your home.
Understanding these variables will help you gauge where your project sits within the pricing ranges below.
HUP Extension Pricing
HUP extensions have predictable performance and build times, resulting in more consistent costs than traditional block construction.
The price of a HUP build is mainly determined by its footprint, the number of full-height walls, the style of openings (such as bifold or sliding doors), and the internal finish you choose.
Typical HUP Extension Costs:
- Approx. 9m² (3m × 3m): £20,700 – £27,000+
- Approx. 16m² (4m × 4m): £36,800 – £48,000+
- Approx. 24m² (4m × 6m): £55,200 – £75,000+
These prices reflect the core HUP structure and standard specification. Final costs depend on your chosen layout, glazing style, and any design features you’d like to include, which we confirm during your free survey.
For an exact cost based on your plans and layout, request a free HUP extension quote.
Why Homeowners Choose HUP
A HUP extension provides:
- Outstanding thermal efficiency
- Faster installation and less disruption
- Up to 10% more internal space vs. traditional builds
- Lower running costs
- Modern internal finish
- Full building regulations compliance
To learn more about how the system works, see our HUP extension information page.
Every HUP project includes a structural assessment, a detailed quote, and complete installation handled by the Urban Edge team.
Conservatory Roof Replacement Pricing
Most modern conservatory roof replacements fall within a broad range of £6,000 – £20,000+, depending on the size of the conservatory, the condition of the existing structure, and whether any reinforcement is required. The type of internal finish, lighting, and insulation level can also influence the final price, which is why a quick survey is the only accurate way to confirm costs.
These ranges give a clear guide to typical roof upgrade costs based on conservatory size and structural needs. For an exact price based on your conservatory and structure, contact us for a free, accurate quote.
Instead of publishing separate prices for tiled, hybrid, and glass roofs, we provide a unified price range that reflects the differences in size, weight, and reinforcement requirements across conservatory types.
Modern insulated roofs are engineered to be lightweight but highly efficient, often delivering far better insulation and noise reduction than older polycarbonate or basic glass systems. Most installations take 2–5 days, depending on the roof’s size and complexity.
What’s Included
Every project includes the full insulated roof system or HUP structure, internal plastering, and all core components needed to complete the room to a modern standard.
This covers the structural assessment, manufacturing, installation, finishing, and building regulations sign-off where required. We also handle waste removal and any temporary protection to ensure the workspace stays clean and safe throughout the build.
- Fully insulated solid or hybrid roof
- Plastered ceiling (vaulted or flat)
- Integrated lighting (spots or LED options)
- Optional skylights/roof windows
- Significantly improved insulation and comfort
- Reduced glare and noise
- Professional installation + full building regs certification
Depending on your design, optional upgrades such as skylights, decorative lighting, additional wiring, or improved insulation can be added during the planning stage. It will be included clearly in your itemised quote.
Is Upgrading Worth It?
For most households, yes.
Both HUP extensions and replacement roofs deliver:
- Better thermal performance
- Lower heating bills
- A more usable room all year round
- Reduced noise, glare, and heat extremes
- A modern interior finish
- Higher property value
- Faster build times compared with traditional methods
You also avoid the cost and disruption of a full rebuild. In many cases, a roof upgrade alone is enough to turn a cold or unused conservatory into a space you actually enjoy every day.
Get an Accurate Quote
How Urban Edge Manages Your Project
Our process is designed to be clear and well-managed from start to finish, with every project overseen by Managing Director Greg Tatchell and his 35+ years of experience:
- Free Survey & Assessment
- We review your structure and discuss suitable options.
- Detailed Quote
- Fully itemised and tailored to your exact requirements.
- Precision Manufacturing
- Components built to exact measurements.
- Professional Installation
- Fast, clean, and carried out by an experienced team.
- Finishing & Certification