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How much will your HMO refurbishment actually cost? The answer ranges from £15,000 for a light cosmetic refresh to well over £100,000 for a full house-to-HMO conversion — and the difference between a profitable project and a money pit often comes down to how accurately you budget before the first tradesperson sets foot on site.
This guide provides itemised cost breakdowns specific to HMO projects, covering everything from fire door installations and en-suite additions to full conversion budgets. All figures reflect 2026 UK costs and are based on typical HMO development finance projects.
We provide cost data to help you plan your project. For finance options, see our HMO refurbishment finance guide.
How Much Does an HMO Refurbishment Cost?
A quick overview of typical budget ranges by project type:
| Project Type | Typical Cost Range | Timeline |
|---|---|---|
| Light cosmetic refurbishment | £15,000 – £30,000 | 4 – 8 weeks |
| Medium refurbishment (kitchen, bathrooms, compliance) | £30,000 – £50,000 | 6 – 12 weeks |
| Heavy refurbishment (structural changes, layout) | £40,000 – £80,000 | 10 – 20 weeks |
| Full house-to-HMO conversion | £50,000 – £120,000+ | 12 – 30 weeks |
These ranges assume a 4–6 bed property in average condition. Larger properties, London/South East locations, and properties in poor structural condition will push costs toward the higher end — or beyond.
For more on this topic, see our guide to HMO Property vs Buy to Let Property: What’s the difference?.
For more on this topic, see our guide to comprehensive guide.
The key cost drivers specific to HMOs (that do not apply to standard BTL refurbishments) are fire safety compliance, en-suite bathroom installations, and communal area fit-outs. These can add £10,000–£30,000+ to a project compared with an equivalent single-household refurbishment.
Regional variation is significant. Labour rates in London and the South East can be 30%–50% higher than the Midlands or North. Material costs are relatively consistent nationally, but trades costs — which make up the majority of most refurbishment budgets — vary enormously. The figures in this guide are based on UK averages; adjust upward for London/South East and downward for lower-cost regions.
It is also worth noting that costs have risen materially since 2022, driven by material price inflation, labour shortages in skilled trades, and increased building regulations requirements. Budgets based on pre-2024 cost data are likely to underestimate current project costs by 10%–20%.
Light Refurbishment Costs (Cosmetic, £15k–£30k)
Light refurbishment applies when the property is already in reasonable structural condition and may already be configured as an HMO or multi-room layout. The work is cosmetic and compliance-focused.
Typical Light Refurbishment Scope
| Work Item | Typical Cost |
|---|---|
| Full redecoration (all rooms) | £3,000 – £6,000 |
| New flooring throughout | £2,500 – £5,000 |
| Kitchen refresh (doors, worktops, appliances) | £2,000 – £4,000 |
| Bathroom refresh (per bathroom) | £1,500 – £3,000 |
| Fire door installation (per door) | £350 – £600 |
| Fire alarm system upgrade | £800 – £2,000 |
| Emergency lighting | £500 – £1,200 |
| General repairs and making good | £1,500 – £3,000 |
| Skip hire and waste removal | £500 – £1,500 |
| Total light refurbishment | £15,000 – £30,000 |
Light refurbishment is typically funded through a standard bridging loan or personal funds. The short timeline and modest budget mean that finance costs are relatively low.
The scope of light refurbishment is often dictated by the property's current HMO compliance status. If the property is already operating as an HMO but looking tired, the refurbishment focuses on cosmetic improvements and compliance updates. If it was previously a single dwelling but is already configured with enough bedrooms, the work centres on adding the HMO-specific compliance items (fire doors, alarms, signage) while refreshing the cosmetic condition.
A common trap with light refurbishment is underestimating the fire safety requirements. What appears to be a simple cosmetic refresh can quickly become a medium-budget project once fire doors, a Grade A alarm system, and emergency lighting are factored in. Always get a fire risk assessment before finalising your budget.
Heavy Refurbishment Costs (Structural, £40k–£80k+)
Heavy refurbishment involves structural changes to the property — removing or adding walls, reconfiguring layouts, installing additional bathrooms, or upgrading services (plumbing, electrics) to handle the increased demand of multi-occupancy use.
Typical Heavy Refurbishment Scope
| Work Item | Typical Cost |
|---|---|
| Structural alterations (wall removal/addition) | £3,000 – £8,000 |
| New partition walls (per wall) | £800 – £1,500 |
| Full rewire | £4,000 – £8,000 |
| Full replumb (including additional bathrooms) | £5,000 – £12,000 |
| New central heating system | £3,000 – £6,000 |
| En-suite bathrooms (per room, supply and install) | £3,500 – £6,000 |
| New communal kitchen (full installation) | £5,000 – £10,000 |
| Fire compartmentation (30-min or 60-min) | £3,000 – £7,000 |
| Fire doors (full set, 6-bed) | £2,100 – £3,600 |
| Fire alarm and emergency lighting | £1,500 – £3,500 |
| Flooring throughout | £3,000 – £6,000 |
| Decoration throughout | £3,000 – £6,000 |
| External works (guttering, damp proofing) | £2,000 – £5,000 |
| Waste removal | £1,000 – £2,500 |
| Total heavy refurbishment | £40,000 – £80,000+ |
Heavy refurbishment typically requires specialist finance — either a heavy-refurb bridging loan or development finance with staged draw-downs.
Full HMO Conversion Costs (House to HMO, £50k–£120k+)
A full conversion transforms a standard family house into a purpose-built HMO. This is the most comprehensive (and expensive) refurbishment type, involving structural work, change of use, compliance upgrades, and full fit-out.
Typical Full Conversion Scope
| Work Item | Typical Cost |
|---|---|
| Architect/designer fees | £2,000 – £5,000 |
| Planning application (if required) | £462 (standard fee) |
| Building regulations application and sign-off | £500 – £1,500 |
| Structural engineer | £500 – £1,500 |
| Strip-out and demolition | £2,000 – £5,000 |
| Structural alterations | £5,000 – £15,000 |
| New partition walls (creating additional bedrooms) | £4,000 – £10,000 |
| Full rewire (multi-circuit, per-room metering capability) | £5,000 – £10,000 |
| Full replumb (multiple bathrooms, communal kitchen) | £6,000 – £15,000 |
| Central heating (potentially multiple zones) | £4,000 – £8,000 |
| En-suite bathrooms × 4–6 | £14,000 – £36,000 |
| Communal kitchen (commercial-grade) | £6,000 – £12,000 |
| Fire compartmentation (floors, walls, ceiling) | £4,000 – £10,000 |
| Fire doors × 8–12 | £2,800 – £7,200 |
| Fire alarm system (Grade A LD2) | £1,500 – £3,500 |
| Emergency lighting | £600 – £1,500 |
| Flooring throughout | £3,500 – £7,000 |
| Decoration throughout | £3,000 – £7,000 |
| External works | £2,000 – £6,000 |
| Waste removal | £1,500 – £3,000 |
| Furniture and white goods | £4,000 – £10,000 |
| Total full conversion | £50,000 – £120,000+ |
A full conversion is a development project, not a refurbishment in any casual sense. It requires project management, professional oversight, and a structured finance facility. Attempting to manage a full conversion on a shoestring budget with no contingency is one of the most common ways HMO investors lose money.
The wide cost range reflects the enormous variation in property size, condition, and specification. A 4-bed semi requiring modest reconfiguration sits at the lower end; a large detached requiring significant structural work, multiple en-suites, and high-specification fit-out pushes toward or beyond the upper end.
For guidance on the conversion process itself, see our HMO conversion complete guide.
Room-by-Room Cost Breakdown
Bedrooms (Including En-Suite Additions)
The bedrooms are the revenue-generating units of your HMO. Each room must meet minimum size standards and, increasingly, tenants expect en-suite facilities.
| Item | Cost per Room |
|---|---|
| Decoration (walls, ceiling) | £400 – £800 |
| Flooring (vinyl or laminate) | £300 – £600 |
| Fitted furniture (wardrobe, desk) | £400 – £1,000 |
| Lighting and electrics | £200 – £400 |
| Fire door | £350 – £600 |
| Window (if replacement needed) | £400 – £800 |
| Bedroom total (no en-suite) | £2,050 – £4,200 |
| En-suite bathroom addition | £3,500 – £6,000 |
| Bedroom total (with en-suite) | £5,550 – £10,200 |
En-suite additions are the single largest per-room cost but can significantly increase both rental income (£50–£100+ per room per month) and property valuation.
For minimum room size requirements, see our HMO room sizes and minimum standards guide.
Communal Kitchen
HMO kitchens take significantly more wear and tear than domestic kitchens. Specifying durable, commercial-grade units and appliances reduces long-term maintenance costs.
| Item | Typical Cost |
|---|---|
| Kitchen units (mid-range, durable) | £2,000 – £5,000 |
| Worktops (laminate or solid surface) | £500 – £1,500 |
| Appliances (oven × 2, hob, fridge-freezer × 2, washing machine, dishwasher) | £2,000 – £4,000 |
| Plumbing and electrics | £1,000 – £2,000 |
| Flooring (commercial-grade vinyl) | £400 – £800 |
| Decoration | £300 – £600 |
| Fire safety (fire blanket, extinguisher, heat detector) | £100 – £250 |
| Kitchen total | £6,300 – £14,150 |
Budget for duplicate appliances in HMOs with 6+ tenants. A single oven and fridge-freezer causes conflict — and conflict causes voids.
Communal Bathrooms
If not providing en-suites to every room, shared bathrooms need to be robust and easy to clean.
| Item | Typical Cost |
|---|---|
| Bathroom suite (toilet, basin, shower/bath) | £500 – £1,200 |
| Tiling (floor and walls) | £600 – £1,500 |
| Plumbing | £500 – £1,000 |
| Extractor fan | £100 – £300 |
| Flooring | £200 – £400 |
| Decoration | £200 – £400 |
| Bathroom total | £2,100 – £4,800 |
Communal Areas (Hallways, Living Rooms)
Hallways, staircases, and any communal living areas need durable finishes and fire-safe design.
For more on this topic, see our guide to Overcoming Challenges in HMO Remortgaging.
| Item | Typical Cost |
|---|---|
| Decoration | £500 – £1,500 |
| Flooring (commercial-grade, fire-rated) | £500 – £1,500 |
| Lighting (including emergency lighting) | £300 – £800 |
| Fire signage and extinguishers | £100 – £300 |
| Stair carpet or hard flooring | £400 – £1,000 |
| Communal areas total | £1,800 – £5,100 |
HMO Compliance Costs
HMO compliance items are non-negotiable — they are legally required and council inspections will check them. These costs do not apply to standard BTL refurbishments, making them a uniquely HMO-specific budget line.
Fire Doors
| Specification | Cost per Door (Supply and Install) |
|---|---|
| FD30 (30-minute) fire door with intumescent strips, smoke seals, and self-closer | £350 – £600 |
| FD60 (60-minute) fire door (required in some configurations) | £500 – £800 |
A 6-bed HMO typically requires 8–12 fire doors (each bedroom, kitchen, and communal room doors, plus any doors opening onto escape routes). Budget £3,000–£7,000 for fire doors on a typical project.
For full fire safety requirements, see our HMO fire safety requirements guide.
Fire Alarm Systems
| System Type | Cost |
|---|---|
| Grade D (basic interlinked smoke/heat detectors) | £300 – £600 |
| Grade A LD2 (full addressable panel system — required for most licensable HMOs) | £1,500 – £3,500 |
Most councils require a Grade A LD2 system for licensable HMOs, in line with the Regulatory Reform (Fire Safety) Order 2005. Do not cut corners here — an inadequate fire alarm is the most common reason for HMO licence refusal or enforcement action.
Emergency Lighting
| Item | Cost |
|---|---|
| Emergency lighting system (maintained or non-maintained) | £500 – £1,500 |
| Annual testing and certification | £100 – £200 |
Smoke Seals and Intumescent Strips
These are fitted to fire doors and are included in the fire door costs above. However, if retrofitting seals to existing doors:
| Item | Cost per Door |
|---|---|
| Intumescent strips (supply and fit) | £30 – £60 |
| Cold smoke seals (supply and fit) | £20 – £40 |
Building Regulations and Planning Costs
| Item | Cost |
|---|---|
| Planning application (householder) | £462 |
| Planning application (change of use) | £462 |
| Building regulations application (building notice) | £400 – £800 |
| Building regulations application (full plans) | £500 – £1,200 |
| Building control inspections (included in application fee) | — |
| Approved inspector (alternative to council building control) | £600 – £1,500 |
Not all HMO conversions require planning permission. If your area is not subject to an Article 4 direction for HMOs, converting a dwelling (C3) to a small HMO (C4, up to 6 people) may fall under permitted development. Larger HMOs (7+) almost always require planning permission.
For planning guidance, see our HMO planning permission guide.
Professional Fees
| Professional | Typical Fee |
|---|---|
| Architect (drawings and planning support) | £1,500 – £4,000 |
| Structural engineer | £400 – £1,500 |
| Project manager (% of build cost) | 8% – 15% |
| Quantity surveyor | £500 – £1,500 |
| Energy assessor (EPC) | £80 – £150 |
| Gas safety certificate | £60 – £100 |
| Electrical installation condition report (EICR) | £150 – £350 |
Not all projects require every professional listed above. Light refurbishments may need only an EICR and EPC. Full conversions typically require an architect, structural engineer, and potentially a project manager.
How Refurbishment Scope Affects Your HMO Valuation
The amount you spend on refurbishment directly affects the post-works valuation — which in turn determines how much you can borrow on the exit mortgage.
There are two valuation approaches used for HMOs:
Bricks and Mortar Valuation
Based on comparable sales of similar properties. Refurbishment that brings the property up to modern standards will improve the bricks-and-mortar value, but there is a ceiling set by comparable properties in the area.
Commercial / Investment Valuation
Based on rental income and yield. This approach rewards refurbishment that increases rental income — en-suite additions, additional bedrooms, and specification improvements that command higher rents.
The key insight: spending money on HMO-specific improvements (en-suites, additional rooms) can add more value than generic cosmetic improvements, because they directly increase the rental income that drives the commercial valuation.
For detailed valuation methodology, see our HMO valuation methods guide. Use the HMO valuation calculator to estimate post-works values.
Budgeting Template — How to Build Your Refurbishment Budget
A robust HMO refurbishment budget includes:
1. Works Costs (Itemised)
List every work item with a cost range. Use the room-by-room breakdown in this guide as a starting point, then refine with contractor quotes specific to your property.
2. Professional Fees
Include architect, structural engineer, building control, and any project management fees.
3. Compliance Costs
Fire doors, alarm systems, emergency lighting, smoke seals. These are easy to overlook in early budgeting.
4. Licensing and Certification
HMO licence application fee, EPC, gas safety certificate, EICR.
5. Finance Costs
Interest on bridging or development finance during the refurbishment period. On a £200,000 bridge at 0.75% pm over 6 months, that is £9,000.
6. Holding Costs
Council tax, insurance, and utilities during the refurbishment period.
7. Contingency (15%)
Non-negotiable. HMO refurbishment projects consistently encounter unexpected costs — structural issues behind walls, asbestos, drainage problems, or specification changes required by building control.
8. Furniture and Furnishing
If letting furnished (most HMOs are), budget for beds, mattresses, desks, chairs, wardrobes, curtains, and communal area furniture.
For guidance on licensing costs, see our HMO licence costs and fees guide. For the full licensing process, see our HMO licensing complete guide.
Cost-Saving Strategies for HMO Refurbishment
1. Specify for Durability, Not Cheapness
The cheapest kitchen doors, flooring, and bathroom fittings will need replacing within 2–3 years in an HMO environment. Mid-range, durable specifications cost more upfront but save money over the first 5 years of ownership.
2. Standardise Across Rooms
Using the same flooring, door handles, light fittings, and paint colours across all rooms reduces wastage, simplifies procurement, and speeds up the fit-out.
3. Buy Appliances and Materials in Bulk
If fitting 6 en-suite bathrooms, buying 6 identical suites from a trade supplier is significantly cheaper than purchasing individually.
4. Manage the Project Yourself (If Experienced)
A project manager adds 8%–15% to the build cost. If you have experience managing refurbishment projects, doing this yourself saves thousands — but only if you can dedicate the time and have the knowledge to manage effectively.
5. Phase Non-Essential Work
If cashflow is tight, complete essential works (compliance, habitable bedrooms, communal areas) first and phase cosmetic improvements over time. Get the property tenanted and generating income before spending on nice-to-haves.
6. Negotiate Contractor Rates for Repeat Work
If you plan multiple HMO projects, negotiate preferential rates with a reliable contractor for ongoing work. Volume commitments attract better pricing.
7. Get Multiple Quotes — But Do Not Always Choose the Cheapest
Three quotes is the minimum for any significant work package. However, the cheapest quote is not always the best value. A contractor who quotes 20% below the others may be underestimating the scope, using lower-quality materials, or not accounting for HMO-specific requirements. The middle quote from a contractor with HMO experience is often the safest choice.
8. Plan for Void Periods During Refurbishment
If you are refurbishing an existing tenanted HMO, you may need to decant tenants during works. Budget for the rental income lost during the refurbishment period — on a 6-bed HMO generating £3,000 pcm, a 3-month refurbishment represents £9,000 of lost income. Factor this into your total project cost.
How Refurbishment Costs Are Funded
The finance strategy should be decided before the project starts, not during it. Compare financing options with HMO mortgages for your exit mortgage and specialist refurbishment funding. Your main options:
| Finance Type | Typical Cost | Best For |
|---|---|---|
| Bridging loan | 0.55% – 1.2% pm + fees | Light/medium refurb, quick projects |
| Development finance | 0.6% – 1.5% pm + monitoring fees | Heavy refurb, full conversions |
| Remortgage (equity release) | 4.5% – 6.0% pa | Investors with existing portfolio equity |
| Personal funds | Nil (opportunity cost only) | Small projects, cash-rich investors |
For full details on each option, read our HMO refurbishment finance guide. For rate comparisons, see our HMO refurbishment mortgage rates guide. Use HMO mortgage calculators to model your project economics and financing costs.
Sources
- GOV.UK — Houses in Multiple Occupation (HMO licensing)
- GOV.UK — HMO licensing reform and minimum room sizes
- GOV.UK — Fire safety: your responsibilities
- Regulatory Reform (Fire Safety) Order 2005
- GOV.UK — Planning permission
- GOV.UK — Article 4 directions
- GOV.UK — Permitted development rights for householders
- GOV.UK — Building regulations approval
- GOV.UK — Domestic private rented property minimum energy efficiency standard (EPC)
- GOV.UK — Gas safety in rented property
- GOV.UK — Electrical safety standards in the private rented sector (EICR)
FAQs
How much does it cost to convert a 4-bed house into a 6-bed HMO?
A typical 4-bed to 6-bed conversion costs between £60,000 and £100,000, depending on the extent of structural work required, whether en-suites are added, and the current condition of the property. The main cost drivers are creating additional bedrooms (partition walls, plumbing for en-suites), fire safety compliance (doors, alarms, compartmentation), and upgrading the communal kitchen and heating system to handle the increased occupancy.
What are the biggest cost overruns in HMO refurbishment?
The three most common cost overruns are: (1) structural issues discovered during strip-out — rotten joists, inadequate foundations, or asbestos, which can add £5,000–£15,000; (2) plumbing and drainage — older properties often need complete replumbing when adding multiple en-suites, and underground drainage may need upgrading; (3) building control requirements that exceed initial expectations, such as additional fire compartmentation or soundproofing. A 15% contingency helps absorb these.
How much do HMO fire doors cost to install?
A standard FD30 (30-minute) fire door, fully installed with intumescent strips, cold smoke seals, and self-closing device, typically costs £350–£600 per door. FD60 (60-minute) doors cost £500–£800. A 6-bed HMO usually requires 8–12 fire doors, giving a total fire door budget of £2,800–£7,200. Prices vary by region and whether the door frames also need replacing.
Should I add en-suites to every room in my HMO?
In most markets, yes — en-suites significantly increase both rental income (typically £50–£100+ per room per month) and property valuation. However, they are only worth adding if the room sizes remain above the minimum standards after the en-suite is installed (a single bedroom must be at least 6.51 sq m, though most councils require larger). In some lower-rent areas, the additional rental income may not justify the £3,500–£6,000 per-room cost. Model the numbers using your local rental market data.
How do I estimate refurbishment costs before purchasing?
Before purchasing, you can estimate costs by: (1) conducting a detailed property viewing with a builder or surveyor who can identify structural issues, compliance gaps, and the scope of work; (2) using the room-by-room cost data in this guide as a baseline, adjusted for your region; (3) obtaining indicative quotes from 2–3 contractors based on a preliminary schedule of works; (4) adding 15% contingency for unknowns. Do not rely on a single walkthrough estimate — get itemised costs for each element of the project.