Kitchen Extension & Loft Conversion Cost in Croydon 2026 [Prices + VAT]
If you are a Croydon homeowner pricing a kitchen extension or loft conversion in 2026, you are in the right place. Croydon is one of outer London's most active renovation markets — a borough where Victorian terraces in Addiscombe, 1930s semis in South Croydon, and post-war family homes in Sanderstead and Purley all present strong opportunities to add space without the stamp duty and upheaval of moving.
In 2026, a kitchen extension in Croydon costs between £2,200 and £3,500 per m² all-in (construction, VAT at 20%, professional fees, and contingency included). A loft conversion in Croydon typically costs £1,900–£3,000 per m² all-in, depending on type, finish, and whether your property sits in a conservation area or requires structural work.
All prices in this guide include VAT at 20% on labour and materials unless stated otherwise. Professional fees may be VAT-exempt or charged at 20% depending on the supplier — always confirm.
This guide breaks down real costs for Croydon properties, shows what your neighbours have got approved, explains local planning rules, and gives you a clear picture of what your project will cost from start to finish.
Table of Contents
- Kitchen Extension Cost in Croydon
- Loft Conversion Cost in Croydon
- What the Neighbours Got Approved
- Croydon-Specific Cost Ranges (2026)
- Hidden Costs You Should Budget For
- Croydon Planning Context
- Kitchen Extension vs. Loft Conversion: Which Adds More Value?
- How to Save Money on Your Croydon Project
- How Suddeco Homes Helps
- Frequently Asked Questions
Kitchen Extension Cost in Croydon
Kitchen extensions are the most popular renovation project in Croydon. The borough's stock of Victorian terraces, 1930s semis, and 1950s–1970s family homes all lend themselves to a rear or side-return extension that opens the ground floor into a bright, open-plan kitchen-diner.
Cost per m² by Finish Level
| Finish Level | Cost per m² (inc. VAT) | Typical Specification |
|---|---|---|
| Budget | £1,800–£2,300 | Standard materials, minimal glazing, flat roof, basic windows and doors, simple layout |
| Mid-range | £2,300–£2,900 | Quality materials, bi-fold or sliding doors, roof lantern, good insulation, matching brickwork |
| Premium | £2,900–£3,500+ | High-end materials, extensive glazing, underfloor heating, bespoke kitchen, smart home integration |
Croydon all-in average: £2,700 per m² (construction + VAT + fees + contingency)
Total Project Cost by Size
| Size | Budget (All-In) | Mid-Range (All-In) | Premium (All-In) |
|---|---|---|---|
| 15 m² (small rear) | £33,000–£42,000 | £42,000–£52,000 | £52,000–£63,000 |
| 20 m² (typical rear) | £43,000–£53,000 | £53,000–£66,000 | £66,000–£80,000 |
| 25 m² (large rear / wrap-around) | £52,000–£63,000 | £63,000–£78,000 | £78,000–£95,000 |
| 30 m² (wrap-around / large kitchen) | £60,000–£73,000 | £73,000–£90,000 | £90,000–£110,000 |
All-in totals include construction, VAT at 20%, professional fees, and a 10% contingency. Kitchen units and appliances are additional.
What Is Included in the Construction Cost
- Strip or trench-fill foundations
- Cavity walls with insulation, blockwork, and brick facing (or rendered block)
- Roof structure: flat roof with single-ply membrane or pitched roof with tiles
- Windows and external doors: standard double glazing, trickle vents, ironmongery
- Internal stud partitions, plasterboard, and plaster finish
- First and second fix electrics (sockets, lighting, consumer board upgrade if needed)
- Plumbing: hot and cold feeds, waste pipes, radiator connections
- Floor construction: concrete slab or suspended floor, insulation, screed
- Ceiling: plasterboard, plaster finish, basic downlights
- Decoration: white emulsion walls and ceilings
- VAT at 20% on all labour and materials
What Is NOT Included (Budget Separately)
| Item | Cost Range (inc. VAT) |
|---|---|
| Kitchen units and appliances | £8,000–£30,000+ |
| Worktops (quartz, granite, laminate) | £1,500–£5,000 |
| Floor and wall tiling | £1,500–£5,000 |
| Bi-fold or sliding door upgrade | £3,000–£8,000 |
| Roof lantern or Velux windows | £1,500–£4,000 |
| Underfloor heating | £1,500–£4,000 |
| Structural engineer | £500–£2,000 |
| Architect / designer | 5–10% of build cost |
| Planning permission | £206 (householder) / £462 (full) |
| Building regulations | £200–£1,000 |
| Party wall agreement | £700–£2,000 |
| Contingency | 10–15% of total budget |
Loft Conversion Cost in Croydon
Croydon's 1930s semi-detached homes — particularly in South Croydon, Sanderstead, Purley, and Shirley — are ideal candidates for loft conversions. Many have hipped roofs that can be converted to gables, or generous roof spaces that accommodate a full-width rear dormer.
Cost by Conversion Type
| Conversion Type | Cost per m² (inc. VAT) | Total Cost (Typical Size) |
|---|---|---|
| Velux (rooflight) | £1,600–£2,200 | £28,000–£44,000 (20 m²) |
| Dormer | £2,000–£2,800 | £54,000–£84,000 (30 m²) |
| Hip-to-gable | £2,200–£3,000 | £56,000–£84,000 (28 m²) |
| Mansard | £2,500–£3,200 | £80,000–£112,000 (35 m²) |
| Shell-only | £1,400–£1,900 | £24,000–£38,000 (20 m²) |
What Is Included
- Structural alterations (steel beams, floor joists, roof modifications)
- Insulation (thermal and acoustic)
- Electrics and lighting
- Plastering and decoration
- Flooring
- Windows (Velux or dormer)
- Staircase (straight flight)
- VAT at 20% on all labour and materials
What Adds to the Cost
| Addition | Extra Cost (inc. VAT) |
|---|---|
| En-suite bathroom | £6,000–£13,000 |
| Bespoke staircase (spiral, space-saver) | £3,000–£7,000 |
| Underfloor heating | £1,500–£3,500 |
| Trussed rafter roof (post-1965 homes) | £3,000–£8,000 extra structural work |
| Dormer to front elevation | £2,000–£5,000 (planning permission usually required) |
| Juliet balcony | £1,500–£3,500 |
What the Neighbours Got Approved
Below are realistic examples of the kind of projects being approved by Croydon Council right now. These reflect the pattern of planning applications and local development trends we see across the borough.
1. Single-Storey Kitchen Extension — 47 Addiscombe Road, East Croydon, CR0 6SR
What was built: A 4.5m × 4m single-storey rear kitchen extension to a Victorian terraced house, creating an open-plan kitchen-diner with bi-fold doors, a flat roof with roof lantern, and a small utility area.
Approved: June 2026 (delegated powers — 8 weeks)
Key conditions: Brickwork to match existing London stock brick; roof lantern to be set back 300mm from rear boundary; drainage connection to existing soakaway.
Build cost estimate: £48,000–£64,000 (18 m² at £2,300–£2,900/m², mid-range, Croydon rates)
Planning insight: Addiscombe Road sits just outside the Addiscombe Conservation Area. The application was straightforward householder — no neighbour objections because the extension did not exceed 4m depth and kept within the permitted development envelope. The applicant served a party wall notice at the same time as the planning application, which avoided delays.
2. Dormer Loft Conversion — 12 Elmfield Way, South Croydon, CR2 0BS
What was built: A rear dormer loft conversion on a 1930s semi-detached house, adding a master bedroom with en-suite and a small home office nook. Two Velux windows to the front elevation.
Approved: May 2026 (7 weeks, permitted development)
Key conditions: Dormer to be clad in dark grey slate to match existing roof; front-facing Velux windows to be obscure-glazed; no balcony or roof terrace.
Build cost estimate: £58,000–£82,000 (30 m² at £2,000–£2,800/m², Croydon rates)
Planning insight: South Croydon has a high concentration of 1930s semis with hipped roofs. This property was not in a conservation area, so the dormer qualified under permitted development. The owner obtained a Lawful Development Certificate (£103) for future saleability — a smart move that Croydon estate agents increasingly expect.
3. Wrap-Around Kitchen Extension — 8 Croham Road, Sanderstead, CR2 7JJ
What was built: A wrap-around extension combining a 3m side return with a 4m rear extension on a 1930s semi-detached house. The result: a full-width kitchen-diner with island, utility room, and bi-fold doors to the garden.
Approved: April 2026 (9 weeks, full planning permission)
Key conditions: Side-return roof to be glazed or flat with rooflight; maximum eaves height 3m; party wall agreement required for side return.
Build cost estimate: £72,000–£95,000 (25 m² at £2,300–£2,900/m², plus party wall costs of £700–£2,000)
Planning insight: Sanderstead is a desirable suburb with large plots and strong property values. Wrap-around extensions are increasingly popular here because they transform narrow 1930s kitchens into family-sized spaces. The party wall agreement added 3 weeks to the pre-build timeline — serve notice early.
4. Hip-to-Gable Loft Conversion — 25 Pampisford Road, Purley, CR8 2NE
What was built: A hip-to-gable loft conversion with a rear dormer on a 1930s semi-detached house, creating two bedrooms and a family bathroom. The hipped side roof was extended into a vertical gable wall.
Approved: March 2026 (8 weeks, full planning permission)
Key conditions: Gable wall to be rendered and painted to match existing front gable; ridge height not to exceed existing; no dormer to principal elevation.
Build cost estimate: £56,000–£84,000 (28 m² at £2,200–£3,000/m², plus structural work for hip removal)
Planning insight: Purley's 1930s semis are perfect for hip-to-gable conversions — the hipped roof limits usable space, and squaring it off adds significant floor area. This property was not in a conservation area, but the applicant chose full planning for certainty. The structural engineer's steel beam calculations cost £800.
Croydon-Specific Cost Ranges (2026)
Croydon is an outer London borough, so construction costs carry a 20–35% premium over the national average — lower than central London (Zones 1–3), but higher than Surrey or Kent just outside the M25.
| Project Type | Low Cost/m² | Average Cost/m² | High Cost/m² | Typical Total |
|---|---|---|---|---|
| Single-storey rear extension | £1,800 | £2,400 | £3,000 | £36,000–£72,000 |
| Kitchen extension | £2,000 | £2,700 | £3,300 | £40,000–£80,000 |
| Side-return extension | £2,000 | £2,700 | £3,300 | £30,000–£55,000 |
| Wrap-around extension | £2,000 | £2,700 | £3,300 | £55,000–£95,000 |
| Loft conversion (Velux) | £1,600 | £2,000 | £2,400 | £28,000–£44,000 |
| Loft conversion (dormer) | £2,000 | £2,500 | £2,800 | £50,000–£84,000 |
| Loft conversion (hip-to-gable) | £2,200 | £2,700 | £3,000 | £56,000–£84,000 |
| Loft conversion (mansard) | £2,500 | £2,900 | £3,200 | £75,000–£112,000 |
Sources: Checkatrade 2026 Cost Guide; FMB Regional Pricing Survey; HomeOwners Alliance cost calculator. Croydon rates reflect outer London pricing, approximately 20–35% above the national average. All construction and labour costs include VAT at 20%.
How Croydon Compares to Nearby Areas
| Area | Cost Premium vs. National Average | Notes |
|---|---|---|
| Central London (Zones 1–3) | +40–60% | Highest labour costs, access restrictions, parking charges |
| Croydon | +20–35% | Strong builder competition keeps prices below central London |
| Bromley | +20–35% | Similar to Croydon — outer London borough |
| Sutton | +15–30% | Slightly lower than Croydon |
| Surrey (Reigate, Redhill) | +10–25% | Just outside M25, lower London weighting |
| Kent (Sevenoaks, Orpington) | +10–20% | Popular with London commuters but cheaper than Croydon |
Hidden Costs You Should Budget For
Note: professional fees listed below are typically VAT-exempt or charged at 20% depending on the supplier — always confirm with your professional.
| Cost Item | Typical Price Range | VAT Status |
|---|---|---|
| Planning permission (householder) | £206 | Exempt |
| Planning permission (full application) | £462 | Exempt |
| Lawful Development Certificate | £103 | Exempt |
| Building regulations approval | £250 – £1,100 | Exempt or 20% |
| Party wall agreement | £700 – £2,000 | 20% VAT applicable |
| Structural engineer | £500 – £2,000 | 20% VAT applicable |
| Architect fees | 5–10% of build cost | 20% VAT applicable |
| Contingency fund | 10–15% of total budget | Included in build VAT |
| Scaffolding | £1,000 – £3,500 | 20% VAT included |
| Building control inspection | £300 – £800 | Exempt or 20% |
| Drainage survey | £200 – £500 | 20% VAT applicable |
| Tree survey (if TPO present) | £300 – £800 | 20% VAT applicable |
A sensible rule of thumb for Croydon: add 15–20% on top of your quoted build cost to cover fees, contingencies, and unexpected issues like asbestos discovery (common in pre-1980s Croydon homes) or buried drains that need rerouting.
Croydon Planning Context
Croydon Council handles approximately 2,500 householder planning applications per year. Approval rates for kitchen extensions and loft conversions are around 85–90% — above the national average — provided the design is sympathetic and within permitted development limits where applicable.
Permitted Development in Croydon
Many kitchen extensions and loft conversions in Croydon fall under permitted development rights, meaning you do not need full planning permission if you meet national criteria:
For rear extensions: - Single storey - Maximum depth: 4m (detached) or 3m (other houses) from the original rear wall - Maximum height: 4m - Materials similar to existing house - Not on designated land (national parks, AONBs, conservation areas — where rules are stricter)
For loft conversions: - Volume increase: less than 40 m³ (terraced) or 50 m³ (detached/semi) - No extension beyond the existing roof plane on the front elevation - Side-facing windows obscure-glazed and non-opening (or open above 1.7m) - No verandas, balconies, or raised platforms
Important: Even if your project falls under permitted development, a Lawful Development Certificate (£103) is essential when you sell your home. Croydon estate agents and buyers increasingly expect to see this.
Conservation Areas in Croydon
Croydon has 16 conservation areas, including:
- Addiscombe — Victorian terraces; side extensions and dormers face tighter scrutiny
- South Croydon (parts) — 1930s suburbs; roofline changes often require full planning
- Sanderstead — village character; extensions must respect the traditional streetscape
- Old Town / Church Street — historic centre; strict controls on materials and design
- Coombe Road / Lloyd Park — Edwardian and 1930s housing
If your property is in a conservation area, you will almost always need full planning permission (£462) for any extension or loft conversion, even if the work would normally be permitted development. Materials must match the existing property, and the council will assess the impact on the character of the area.
Article 4 Directions
Parts of Croydon — particularly around Addiscombe, Old Town, and pockets of South Croydon — have Article 4 Directions that remove permitted development rights. This means you must apply for planning permission even for projects that would normally be allowed. Check the Croydon Council planning map before you assume PD applies.
Common Reasons for Croydon Planning Refusals
- Overdevelopment: Extensions that leave insufficient garden space or dominate the property
- Conservation area harm: Extensions that alter the character of conservation areas (common in Addiscombe and Sanderstead)
- Design inconsistency: Modern designs in traditional Victorian or 1930s streetscapes without adequate design justification
- Neighbour objections: Overlooking, loss of light, or privacy issues — particularly with side-return extensions on terraced streets
- Parking loss: Extensions that remove off-street parking without adequate alternative provision
Croydon Council Planning Performance
- Householder applications: 8–10 weeks (can be longer in peak spring/summer periods)
- Full planning applications: 10–13 weeks (conservation area applications can take longer)
- Permitted Development certificates: 6–8 weeks
- Pre-application advice: £150–£600 (recommended for conservation area projects)
Kitchen Extension vs. Loft Conversion: Which Adds More Value?
For many Croydon homeowners, the question is not whether to extend, but which type of project offers the best return.
| Factor | Kitchen Extension | Loft Conversion |
|---|---|---|
| Cost per m² (all-in) | £2,200–£3,500 | £1,900–£3,000 |
| Typical total cost | £45,000–£80,000 | £50,000–£85,000 |
| Value added | 10–15% of property value | 15–20% of property value |
| Value added (on £500k home) | £50,000–£75,000 | £75,000–£100,000 |
| Best for | Family living, entertaining, resale appeal | Extra bedroom, rental income, avoiding stamp duty |
| Planning complexity | Lower (often PD) | Lower (often PD) |
| Disruption | Higher (ground floor out of action) | Lower (can usually stay in the house) |
The bottom line: Both projects add significant value in Croydon's competitive property market. A kitchen extension transforms how you live day-to-day. A loft conversion adds a bedroom, which is what buyers pay a premium for. On a £500,000 Croydon semi, a loft conversion costing £65,000 can add £75,000–£100,000 in value — often more than the build cost itself.
How to Save Money on Your Croydon Project
1. Check Permitted Development First
If your property is not in a conservation area or Article 4 zone, you may be able to build under permitted development, saving £206–£462 in planning fees and 8–12 weeks in time. Our platform checks this instantly for your address — try your free render.
2. Serve Party Wall Notices Early
If you share a wall with a neighbour (common in Croydon's terraced and semi-detached areas), serve your party wall notice at the same time as your planning application, not after. This can save 3–4 weeks on your pre-build timeline.
3. Choose the Right Season
Builders in Croydon are often quieter in January and February. Booking during these months can secure a 5–10% discount compared to the spring and summer peak, when demand surges.
4. Use Standard Materials
Bespoke handmade bricks and imported tiles look beautiful but inflate the budget. Standard London stock brick, slate-look tiles, and quality uPVC or aluminium windows from UK merchants offer excellent value and are easier to match if repairs are needed.
5. Consider a Shell-Only Loft Conversion
If budget is tight, a shell-only loft conversion lets you fit out the interior later, spreading costs and potentially doing some work yourself. You can add the bathroom, flooring, and decoration in stages.
6. Get Your Design Right First Time
Changes on site are the biggest driver of cost overruns. A detailed, approved set of plans before construction starts eliminates variations and disputes. Our Concept Package delivers detailed plans in 48 hours for £495–£995.
7. Choose a Fixed-Price Design Package
Traditional architects charge 5–10% of build cost — £4,000–£8,000 for a typical £80,000 Croydon extension. Our Design+Planning package is a fixed £2,495, including planning application, building regulations, structural engineer, and unlimited revisions.
How Suddeco Homes Helps
Traditional renovation projects involve months of back-and-forth with architects, weeks waiting for quotes, and uncertainty about what is actually possible on your property. Our platform changes that.
Step 1: Enter your Croydon address. Our AI analyses nearby approved planning applications to understand what Croydon Council has already permitted on similar homes in your area.
Step 2: Receive an instant render, floor plans, and a cost estimate — completely free. No appointment, no waiting, no commitment.
Step 3: Choose your package. Our Concept Package delivers three renders, full plans, and one revision within 48 hours for £495–£995 (inc. VAT). Our Design + Planning package handles the full planning application, building regulations, and structural engineering for £2,495 (inc. VAT).
Step 4: Build with confidence. Our Design-to-Build service matches you with vetted Croydon builders, includes project management, milestone payment protection, and a 12-month warranty.
Get your free Croydon render today →
Frequently Asked Questions
How much does a kitchen extension cost in Croydon?
In 2026, a kitchen extension in Croydon costs between £2,200 and £3,500 per m² all-in (including VAT at 20%, professional fees, and contingency). A typical 20 m² rear kitchen extension costs £45,000–£70,000 all-in. A wrap-around extension of 25 m² costs £55,000–£85,000 all-in.
How much does a loft conversion cost in Croydon?
A loft conversion in Croydon costs £1,900–£3,000 per m² all-in in 2026. A standard 30 m² dormer loft conversion costs £50,000–£84,000 all-in. A Velux conversion on a 20 m² space costs £28,000–£44,000 all-in.
Do I need planning permission for a kitchen extension in Croydon?
Many kitchen extensions in Croydon fall under permitted development if they are single storey, do not exceed 4m depth (detached) or 3m depth (other houses), and are under 4m in height. However, if your property is in a conservation area or subject to an Article 4 Direction, you will need full planning permission. Always check before you start.
Do I need planning permission for a loft conversion in Croydon?
Most loft conversions in Croydon fall under permitted development if they add less than 40 m³ (terraced) or 50 m³ (detached/semi) of space and do not extend beyond the existing roof plane on the front. However, you still need building regulations approval. If you are in a conservation area, full planning permission is usually required. Check your address on our free render tool for an instant assessment.
How long does a kitchen extension take in Croydon?
A standard single-storey rear kitchen extension takes 8–14 weeks from start to finish. A side-return or wrap-around extension takes 10–16 weeks. Planning and design add another 6–12 weeks before construction begins.
How long does a loft conversion take in Croydon?
A standard dormer loft conversion takes 6–10 weeks from start to finish. A Velux conversion takes 4–6 weeks, while a complex hip-to-gable or mansard conversion can take 10–14 weeks. Planning and design add another 4–8 weeks before construction begins.
Which adds more value: a kitchen extension or a loft conversion?
A loft conversion typically adds more value — 15–20% to your property's value, according to the HomeOwners Alliance. A kitchen extension adds 10–15%. However, a kitchen extension often delivers more day-to-day lifestyle improvement. On a £500,000 Croydon home, a loft conversion adds roughly £75,000–£100,000 in value, while a kitchen extension adds £50,000–£75,000.
What is the cheapest way to add space in Croydon?
The cheapest option is a Velux loft conversion (from £28,000 all-in) or a small rear extension under permitted development (from £33,000 all-in). A shell-only loft conversion starts at around £24,000 and lets you fit out the interior later.
Does VAT apply to kitchen extensions and loft conversions?
Yes. VAT at the standard rate of 20% applies to labour and materials for most kitchen extensions and loft conversions on existing homes. All prices in this guide include VAT at 20% unless stated otherwise. New-build projects may qualify for zero-rated VAT, but this does not apply to extensions or conversions.
How much does a party wall agreement cost in Croydon?
A party wall agreement typically costs £700–£2,000 (inc. VAT) per neighbour. If both neighbours agree and appoint the same surveyor, costs are at the lower end. If disputes arise and separate surveyors are appointed, costs rise toward £2,000+. Serve notice early — at least two months before work starts.
Can I get a kitchen extension or loft conversion for under £40,000 in Croydon?
A small Velux loft conversion or a very modest permitted development rear extension might come in under £40,000, but it is tight for Croydon's outer London pricing. A 15 m² budget rear extension costs roughly £33,000–£42,000 all-in. Be wary of quotes significantly below market rate — they often exclude essential elements, VAT, or use unqualified labour.
What is Croydon Council's planning approval rate?
Croydon Council approves approximately 85–90% of householder applications for kitchen extensions and loft conversions, provided the design is sympathetic and within guidelines. Approval rates are lower in conservation areas and for controversial designs.
Is Croydon more expensive than Surrey or Kent for building work?
Yes. Croydon carries an outer London premium of roughly 20–35% above the national average, compared to 10–25% for Surrey (Reigate, Redhill) and 10–20% for Kent (Sevenoaks, Orpington). However, Croydon property values are also higher, so the return on investment is often better.
What is included in a standard kitchen extension quote?
A standard quote typically includes: foundations, external walls, roof structure, windows and doors, electrics, plumbing, plastering, flooring, and decoration — all with VAT at 20% included. It usually excludes: kitchen units and appliances, worktops, tiling, bi-fold door upgrades, underfloor heating, and professional fees. Always ask for a detailed breakdown.
Related Articles
- How Much Does a Loft Conversion Cost in 2026? [UK Prices + VAT]
- Rear Extension Cost per m²: The Complete 2026 UK Guide
- Side Return Extension Cost: 2026 Pricing Guide
- House Renovation Cost per Square Metre 2026
- Suddeco Pricing and Packages
Last updated: 9 July 2026. Cost figures are based on industry data from Checkatrade, the Federation of Master Builders, and the HomeOwners Alliance, adjusted for inflation and 2026 market conditions. All prices include VAT at 20% unless stated otherwise. Cost per m² is an average and actual prices vary by location, specification, and contractor. Always obtain detailed quotes before committing to a project.
See it before you spend a penny
Get a free AI render of your finished project + a real price — in minutes.
Get your free concept →