HMO Conversions Maidenhead

House to HMO conversions and licence upgrades in Maidenhead, fire doors, detection and shared amenities built to the council's licence standards.

An HMO conversion in Maidenhead turns a family house into a shared house for unrelated tenants, or brings an existing HMO up to the standard its licence demands. The Royal Borough licenses HMOs of five or more people in two or more households, checks amenities and room sizes, and makes unannounced visits. We build the fire doors, detection, escape routes, kitchens, bathrooms and room layouts to the licence standards and your designer's drawings, and the landlord applies for the licence with the measured plan we build to.

For Maidenhead, a light HMO conversion for four to six tenants typically costs £40,000 to £75,000 in construction, or £90,000 to £150,000 with an en-suite to every bedroom (Mayfair Studio and LetCompliance, 2026); a Berkshire price follows a site visit. GS Renovation Ltd, a building contractor based in Potters Bar, does the work in Maidenhead: we build the fire doors, detection, bathrooms and kitchens to the council's HMO standards, the landlord applies for the licence, and a registered electrician certifies the electrics.

Price guide

WorkIndicative range
Light HMO conversion, London, 4 to 6 tenants, construction only (Mayfair Studio)£40,000 to £75,000
Full HMO conversion with en-suites, London, 5 to 6 beds (Mayfair Studio)£90,000 to £150,000
5-bed HMO conversion, London and South East (LetCompliance)£35,000 to £60,000
Fire safety works, typical 5-bed HMO, UK guide (LetCompliance)£5,000 to £9,500
En-suite added to one bedroom, London (Mayfair Studio)£3,500 to £8,000 per room
Second shared bathroom, UK guide (LetCompliance)£4,000 to £9,000

Indicative ranges from published cost guides (Mayfair Studio and LetCompliance, 2026), not a quotation. Each row names its source and whether it is a London, UK or England-wide figure. Berkshire prices follow a site visit. Prices checked September 2026.

Quick estimate from published guides

Guide range: choose above

A tiled bathroom by GS Renovation with a bath, a glass bath screen and a wall-hung WC
A full bathroom with a wall-hung WC. The council's amenity standard sets how many of these an HMO needs for the people living in it.

Planning for a Maidenhead HMO, small or large

Nationally, changing a family house (C3) to a small HMO for three to six unrelated people (C4) is permitted development unless a council direction removes that right. Whether a direction covers small HMOs at a Maidenhead address is for you or your agent to confirm with the Royal Borough's planning team before you buy. Directions can be added, so check again close to exchange, not only at the first viewing.

An HMO for seven or more people is sui generis and needs planning permission. In Maidenhead that application has to meet the borough's National and Local Validation Requirements, adopted on 5 February 2026, or it cannot be made valid, and the layout, cycle and bin storage and parking should be settled first. The owner or a planning agent makes the application. We price from the drawings and build to the consented layout, so the room count on site matches the room count on the permission.

Housing in Maidenhead

Count the homes in Maidenhead and you get about 26,980: 78% built since 1945, 8% between the wars and 12% before 1919, with flats at 33% and houses at 67%.

The Royal Borough HMO licence and the plan it needs

The Royal Borough defines an HMO as a house occupied by three or more people who do not form a single household, and it lists houses converted into self-contained flats among its examples. A licence is needed where five or more people in two or more households share one or more facility, such as a kitchen or bathroom. So a four person shared house in Maidenhead is an HMO with management duties but no mandatory licence, and a fifth tenant brings the licence in.

The mandatory scheme stops short of flats in purpose-built blocks of three or more self-contained flats, which only an additional licensing scheme can catch.

The licence application must include a plan showing the layout of each room with its size and facilities. We measure and fix that layout early, build the walls where the plan shows them, and confirm the finished room sizes so the plan the landlord submits is accurate. The borough says it carries out proactive unannounced visits and responds to complaints, so a Maidenhead HMO needs to match its licence plan on any day, not only on handover day.

Amenities, room sizes and electrics in a Maidenhead HMO

The borough checks Maidenhead HMOs for kitchens, bathrooms, toilets and wash hand basins, and for overcrowding by the number and size of rooms. The number of occupants therefore drives the build. More tenants means more cooking space, sinks, cupboards and fridge space, and more bathrooms and WCs, and an extra bedroom can cost a second shower room. We agree the target occupancy with you before the drawings are fixed, because moving a bathroom after first fix is expensive.

Bedroom sizes are set nationally as mandatory licence conditions: 6.51 square metres for one adult, 10.22 for two, and no room under 4.64 square metres used for sleeping at all. The borough's HMO management summary requires every fixed electrical installation to be inspected and tested at least every five years. We install the wiring so each room's circuits are labelled, and a registered electrician tests and certifies it before the first tenant moves in.

Fire safety, sound and energy in a Maidenhead shared house

Fire safety is the core of an HMO conversion. Bedrooms off a shared stair need fire doors with self closers, the stair becomes a protected escape route, and an interlinked fire detection and alarm system covers the rooms and circulation to the level the layout requires. LACORS housing fire safety guidance is the recognised guide the licensing officer works from, and building regulations Part B applies where the work is notifiable. A larger house with a straight stair is the easiest to protect this way.

Tenants in separate rooms hear each other more than a family does, so we add sound insulation to the walls and floors between lettings where the budget allows. Where the HMO needs an EPC, it must meet the minimum energy efficiency standard, currently an EPC rating of E, unless an exemption is registered. The Royal Borough will not issue a completion certificate unless it has been called for the inspections, and a Maidenhead landlord will want that certificate on file.

  • Bedroom layouts checked against the national minimum room sizes
  • Existing HMOs upgraded to meet their licence conditions
  • Sound lining to bedroom walls and party walls
Service areaMaidenhead · SL6
Local authorityRoyal Borough of Windsor and Maidenhead
Part ofBerkshire · about 26 miles from our base
Typical homesPost-war suburbs with Victorian and Edwardian villas nearer the river
Housing stock12% built before 1919, 8% interwar, 78% post-war; 33% flats, 18% terraced, 45% semi-detached or detached, 5% bungalows
Also covered nearbySlough, Windsor, Beaconsfield and High Wycombe

VOA Council Tax stock of properties, March 2025, for all 7 statistical areas in Maidenhead. Counts rounded by the VOA.

Why Choose GS Renovation in Maidenhead

An HMO has to satisfy a licensing officer as well as a building inspector, so we build to both from the first day. You get a written quotation after a survey, priced from the drawings and the occupancy you plan, and a dated programme with each inspection on it. The fire doors, alarm certificates, electrical test report and room measurements are gathered into one handover pack, ready for the licence application you or your agent make.

  • Fire doors, closers and seals fitted to every door on the escape route
  • Detection laid out to the grade the council's HMO fire guidance sets
  • Materials priced at options, so you choose the finish
30+ YearsFounder's experience
Fully Insured5 year guarantee
4.9 / 531 MyBuilder reviews
Building ControlCompliant
Free QuotesNo obligation
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Saiid did a complete refurbishment of our small bathroom. This involved ripping out the existing bath/shower, basin, toilet, pipework, and tiles and…
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George is a very hard working builder, and has done a fantastic job on replacing my Bathroom. His attention to detail was great and I wouldn't…
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The kitchen has been fitted to the high standard. Saaid was polite, professional, tidy, he pays attention to a little details that make huge…
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FAQ

Frequently Asked Questions about HMO Conversions Maidenhead

How much does an HMO conversion cost in Maidenhead?

Published figures put a light HMO conversion for four to six tenants at £40,000 to £75,000 in construction, and a full conversion with an en-suite to every bedroom at £90,000 to £150,000 (Mayfair Studio, 2026). A Maidenhead house moves within that range with the fire works, the extra bathrooms and the kitchen size. Planning and licence fees are the landlord's and sit outside our quote.

When does a Maidenhead HMO need a licence?

When five or more people forming two or more households share one or more facility, such as a kitchen, bathroom or toilet. That is the Royal Borough's threshold. A smaller shared house is still an HMO with management duties. The landlord applies for the licence, and we build the rooms, amenities and fire precautions to the standard it requires.

Does turning a Maidenhead house into a small HMO need planning permission?

Not unless a council direction removes the national permitted development right from C3 to C4 for three to six sharers. Confirm with the Royal Borough's planning team whether a direction covers the address before you buy. Seven or more sharers is sui generis and needs planning permission, and that application must meet the borough's validation requirements adopted on 5 February 2026.

What plan does a Maidenhead HMO licence application need?

A plan showing the layout of each room with its size and facilities. The Royal Borough asks for it with every HMO licence application, and it checks amenities and overcrowding by the number and size of rooms. We build to a measured layout, so the finished rooms match the plan that goes in with the application.

How often must the electrics be tested in a Maidenhead HMO?

At least every five years. The Royal Borough's HMO management summary requires every fixed electrical installation to be inspected and tested at that interval. A registered electrician carries out the test and issues the report, and we install the wiring in a new HMO so each room's circuits are clearly separated and labelled.

Does the council inspect HMOs in Maidenhead without warning?

Yes. The Royal Borough says it carries out proactive unannounced visits and responds to complaints to make sure HMOs are safe places to live. That is why the fire doors, closers, alarms and amenities we install are built to last under daily use, and why the landlord should keep the test certificates on site.

Can a house converted into flats count as an HMO?

Yes, in some cases. The Royal Borough lists houses converted into self-contained flats among its examples of HMOs. In general law that covers a conversion that fell short of the building regulations standard the Housing Act refers to, where too few flats are owner occupied. A new conversion built and certified under current regulations falls outside it.

How big must a bedroom be in a licensed HMO?

National minimum room sizes are mandatory conditions of a licence: 6.51 square metres for a room slept in by one adult, 10.22 for two adults, and no room under 4.64 square metres used for sleeping. Your designer sets the layout to those sizes, and we build to it and measure the finished rooms for the licence plan.

What fire precautions does a shared house need?

Fire doors with closers to the bedrooms and kitchen, a protected stair or escape route, emergency lighting where the layout needs it, and an interlinked alarm and detection system. The level depends on the number of storeys and occupants, following LACORS housing fire safety guidance. We fit, fire stop and label all of it, and a qualified installer commissions the alarm.

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