HMO Conversion · Altrincham

HMO Conversions in Altrincham

Last updated 06/26 · 11 minute read · Renovat Construction

Reviewed by RICS and PMP certified project management.

Converting a house into an HMO in Altrincham always needs full planning permission. Trafford Council introduced a borough-wide Article 4 direction on 21 December 2017, removing the permitted development right to change a home (use class C3) into a small shared HMO (use class C4) across every part of Trafford, including Altrincham, Sale, Stretford, Urmston, Hale, and Bowdon. You will also need an HMO licence, and the property must meet national standards for room sizes, fire safety, and shared amenities. Most HMO conversions across Trafford cost between £40,000 and £120,000 depending on the number of rooms, the specification, and how much structural work is needed.

Do you need planning permission for an HMO in Altrincham?

Yes, and unlike some boroughs where the rules differ by ward, the answer is always yes across the whole of Trafford. Trafford Council introduced a borough-wide Article 4 direction for small HMOs, confirmed on 15 December 2017 and in force from 21 December 2017. That direction removed the permitted development right that previously allowed landlords anywhere in England to change a family home (use class C3) into a small shared house of three to six people (use class C4) without a planning application.

Several Manchester boroughs rolled out their HMO Article 4 directions in phases, creating partial coverage with exempt wards. Trafford is different: the direction covers every part of the borough from the day it took effect. Altrincham, Sale, Stretford, Urmston, Hale, Bowdon, Timperley, Davyhulme, and Partington are all within the controlled area. There are no wards in Trafford where a C3 to C4 conversion can still be made under permitted development. Source: Trafford Council Article 4 Direction for Small HMOs (confirmed 15 December 2017, in force 21 December 2017).

Two national exceptions apply. A property that was already lawfully operating as a small HMO before 21 December 2017 retains that use, provided it has not since been returned to single-family occupation. And any HMO housing seven or more occupants is classified as sui generis under the Town and Country Planning (Use Classes) Order 1987 (as amended), meaning it has always required full planning permission regardless of any Article 4 direction.

The planning application fee for a C3 to C4 change of use is £258 in 2026 (Planning Portal rate). Architect and planning agent fees to prepare drawings and submit the application typically add £1,500 to £3,500. Allow 8 to 13 weeks for Trafford Council to determine the application. Trafford’s planning policies allow refusal where HMOs already represent a high proportion of housing on a street or in a local area, so checking the existing HMO concentration before exchanging contracts is time well spent.

What counts as an HMO?

Under the Housing Act 2004, a property is a House in Multiple Occupation when it is occupied by at least three tenants who form more than one household and who share a kitchen, bathroom, or toilet. A household is a single person or members of the same family living together, so three friends sharing a house are three separate households, while a couple with a child are one.

There are two separate approval systems to keep in mind: the planning use class, which decides whether you need planning permission to change the use of the property, and the HMO licence, which governs whether you can legally operate it once the works are done. Both are handled by separate teams at Trafford Council and both must be in place before a tenant moves in. Confusing the two, or treating them as the same approval, is one of the most common and costly mistakes landlords make. The table below sets out how the planning use classes work in Altrincham and across Trafford.

Property type	Use class	Occupants	Planning in Trafford
Single dwelling	C3	Family or single household	No change of use needed
Small HMO	C4	3 to 6 sharers	Full planning permission required (Article 4, since December 2017)
Large HMO	Sui generis	7 or more sharers	Full planning permission always required

HMO licensing in Trafford: thresholds and fees

A licence is separate from planning permission. Planning permission changes the legal use of the property; a licence authorises you to operate it as a let. You need both.

Mandatory licensing applies across England under the Housing Act 2004 to any HMO occupied by five or more people forming two or more households who share facilities. From 1 October 2018, mandatory licensing was extended to cover properties of one or two storeys as well as three-plus storey properties, significantly broadening the number of HMOs that require a licence. Operating without a licence is a criminal offence under section 72 of the Housing Act 2004 and carries an unlimited fine. Tenants can also apply for a rent repayment order covering up to 12 months of rent paid during the unlicensed period. Source: gov.uk HMO licensing reform guidance.

Trafford has no additional licensing scheme. Boroughs such as Salford operate a separate additional scheme that requires landlords of smaller three and four person HMOs to hold a licence even below the mandatory threshold, at significant cost. Trafford Council has not introduced such a scheme. If your HMO houses four or fewer people it does not currently require a licence in Trafford. This is one meaningful difference between operating in Trafford and operating in neighbouring boroughs. Always confirm the current position directly with Trafford Council’s Housing Standards team at housing.standards@trafford.gov.uk before committing to a conversion, as local licensing policy can change.

Licence type	Trigger	Position in Trafford
Mandatory HMO licence	5 or more persons, 2 or more households, any storey count (since Oct 2018)	Required
Additional HMO licence	Smaller HMOs (3 to 4 persons) where a local scheme exists	Not required (no scheme currently in Trafford)

HMO licence applications in Trafford are submitted by email to housing.standards@trafford.gov.uk. Each property requires its own licence, and licences last up to five years. Confirm current fee levels and any renewal updates directly with Trafford Council’s Housing Standards team before you apply.

HMO standards: room sizes, fire safety and amenities

A licensed HMO must meet national standards that drive the entire conversion design from the outset. The most critical are the statutory minimum sleeping room sizes, which have applied to every HMO licence in England since 1 October 2018 under The Licensing of Houses in Multiple Occupation (Mandatory Conditions of Licences) (England) Regulations 2018:

• One person aged over 10: at least 6.51 square metres.
• Two people aged over 10 sharing: at least 10.22 square metres.
• One child aged under 10: at least 4.64 square metres.
• Any room under 4.64 square metres cannot be used as sleeping accommodation at all.

This is the most important check to carry out before purchasing. Many 1930s semi-detached houses in Sale, Stretford, and Urmston have third bedrooms of 8 to 9 square metres. That is workable for a single adult occupant but falls short of the 10.22 square metre minimum for two sharing. Measure every room, not just the main bedrooms, before you commit to a property.

Fire safety is where licensing inspections focus most closely. Building Regulations Approved Document B requires a Grade LD2 interlinked fire alarm system covering all habitable rooms and escape routes, FD30 fire doors with self-closing devices on bedroom doors and kitchens, a protected escape route from the top floor to the front door, and emergency lighting on all escape routes. A well-proportioned 1930s semi in Sale or Stretford can need £8,000 to £15,000 in fire safety work alone, before any room conversion or decoration begins.

A compliant HMO also needs adequate shared amenities: a suitably equipped kitchen with cooking facilities, food storage, and a sink scaled for the number of occupants, and enough bathrooms relative to occupancy. Building Regulations approval is required for the structural, fire, acoustic, ventilation, and energy-performance aspects of the conversion, covering Parts B, E, F, G, and L of the Building Regulations 2010.

What an Altrincham HMO conversion involves

A typical HMO conversion in Altrincham or across Trafford works through several trades and approval stages in sequence. The dominant property type in Trafford is the 1930s semi-detached house, which generally offers more generous room proportions than a Victorian terrace but typically has two storeys and a standard layout that may need careful reconfiguration to meet the bedroom-size minimums and provide adequate communal space. The usual scope of work includes:

• Reconfiguring the internal layout to create compliant bedrooms and, where the investment model calls for it, ensuite shower rooms.
• A complete fire safety and compartmentation package: Grade LD2 interlinked alarm, FD30 fire doors with self-closers on all bedroom and kitchen doors, a protected escape staircase, and emergency lighting.
• Upgrading the shared kitchen and any communal bathrooms to meet amenity standards for the number of occupants.
• Full rewire with separate room circuits and individual room meters where required.
• Acoustic insulation between rooms and between floors (Building Regulations Part E) and improvements to thermal performance (Part L).
• Planning application to Trafford Council for the C3 to C4 change of use, and a separate HMO licence application to the Housing Standards team once works are complete and inspected.

Sequencing matters. Securing planning permission before construction starts protects you from spending on a layout the council will not approve. Designing to the licence standards from day one avoids expensive rework after an inspection. For properties in Altrincham town centre, Bowdon, or Sale conservation areas, any visible external changes, including replacement windows, rooflights, or rear outbuildings that do not match the existing character, also require a planning application assessed separately from the HMO change of use. Commission a pre-application planning discussion with Trafford Council before drawing up plans for any conservation area property.

How much does an HMO conversion in Altrincham cost?

Most HMO conversions across Trafford run from £40,000 to £120,000 depending on room count, property condition, and specification. On a per-room basis, expect £8,000 to £15,000 per room for a mid-specification finish. A four-bedroom conversion with shared bathrooms typically costs £40,000 to £65,000; a five or six bedroom property with ensuites runs £65,000 to £120,000.

For a full cost breakdown by room count and project type, including what each element typically costs and how to budget for planning, licensing, and compliance fees, see our guide to HMO conversion costs in Manchester in 2026.

Altrincham and Trafford: area by area

Trafford covers a wide range of property types and price points. Where your investment sits in the borough changes the yield arithmetic considerably.

Area	Typical property	HMO demand driver	Investment note
Stretford and Davyhulme	1930s semi, terrace	MediaCityUK, Trafford Park industrial estate workers	Most accessible purchase price; strongest HMO yield across Trafford
Urmston and Partington	Edwardian and interwar semi	Trafford Park, Manchester Airport corridor	Growing professional demand; solid yields with room to improve
Sale and Timperley	1930s semi, some detached	Metrolink access to city centre; professional tenants	Mid-range prices; check all room sizes carefully before purchase
Altrincham, Hale, and Bowdon	Edwardian, Victorian, 1930s detached	Manchester Airport, professional and healthcare tenants	High purchase price compresses yield; conservation areas require additional planning care

The conservation areas in Altrincham town centre and the Market Quarter, Bowdon, and Sale impose additional controls on external changes. Any alteration that is not a like-for-like replacement, including new windows, a rooflight, or a rear outbuilding in a different material or style, requires a separate planning application assessed against the conservation area character appraisal. This applies in addition to the HMO change of use application. Check the conservation area boundary on Trafford Council’s online mapping tool before drawing up any external works.

Hidden costs that catch Trafford HMO investors out

• Planning application: The Planning Portal fee for a C3 to C4 change of use is £258 in 2026. Add architect and planning agent fees of £1,500 to £3,500 to prepare drawings and submit the application. Allow 8 to 13 weeks for a Trafford Council decision. Check the existing HMO concentration on the street before exchanging, as high density can lead to refusal.
• Conservation area works: External changes at properties in Altrincham, Bowdon, or Sale conservation areas require a separate consent application. Non-matching windows, roof alterations, or outbuildings can be refused. Factor planning agent fees of £800 to £2,000 for a conservation area application.
• Building survey: Commission a full building survey before exchange. At £500 to £800 it routinely reveals failing cavity-wall ties, damp behind render, or outdated wiring that would cost far more if discovered on site.
• Acoustic testing (Part E): Building Regulations Approved Document E requires acoustic separation between bedrooms. A failed sound test after construction means opening up walls and floors. Specify acoustic mineral wool in every partition wall at the design stage to avoid this risk.
• Furniture and appliances: A tenant-ready HMO needs beds, wardrobes, desks, and a fully equipped shared kitchen. Budget £3,000 to £7,000 for a five or six bedroom property.
• Void period during works: A five-bedroom Altrincham HMO at £600 per room loses around £3,000 per month while vacant. Tight project management that keeps the programme on track directly protects your return on investment.

Is a Trafford HMO worth it?

Trafford has consistent professional tenant demand. Manchester Airport is one of the largest single-site employers in the north of England, drawing airport operations staff, airline crew, cargo and ground handling workers who need well-connected accommodation. Trafford Park is Europe’s largest industrial estate and home to major logistics, manufacturing, and distribution operations, generating steady demand from shift workers and professionals. The Metrolink network connects Altrincham and Sale directly into Manchester city centre, making south Trafford popular with city workers who want more space than central Manchester offers at a lower rent.

The trade-off is that Trafford’s Article 4 direction has been in place since late 2017, long enough for the additional planning risk and compliance cost to be fully reflected in the local market. The conversions that work are the ones where the numbers still stack up after the planning application, a fully compliant conversion, and a void period are all priced in. The most viable properties are typically 1930s semis in Stretford, Urmston, and the more affordable parts of Sale, where purchase prices leave enough margin to absorb conversion costs and still deliver a worthwhile yield.

Factor	Lower cost and risk	Higher cost and risk
Location in Trafford	Stretford, Urmston (affordable entry price)	Hale, Bowdon, Altrincham town centre
Bathrooms	Shared bathrooms	Ensuite to every room
Conservation area	Outside any conservation area	Within Altrincham, Bowdon, or Sale conservation area
Property condition	Sound structure, recently updated	Full rewire, damp treatment, structural repairs needed
Planning position	Low HMO concentration on the street	High existing HMO density nearby

Frequently asked questions

Do I need planning permission to convert my Altrincham house into an HMO?

Yes, always. Trafford Council’s borough-wide Article 4 direction came into force on 21 December 2017 and removes the permitted development right to change a house (use class C3) into a small HMO (use class C4) across the entire borough. There are no exempt wards. The planning application fee is £258, and you should allow 8 to 13 weeks for a decision. A large HMO of seven or more occupants is classified as sui generis and has always required planning permission regardless of any Article 4 direction.

Does Trafford have an additional HMO licensing scheme?

No. Trafford operates mandatory HMO licensing only, which applies across England to properties let to five or more people from two or more households. There is no Trafford additional licensing scheme covering smaller three and four person HMOs. This is a meaningful difference from neighbouring Salford, which runs a separate additional scheme at significant cost to landlords. Always confirm the current position with Trafford Council’s Housing Standards team at housing.standards@trafford.gov.uk before proceeding, as local licensing policy can change.

What is the smallest bedroom allowed in a licensed HMO?

For one adult the room must be at least 6.51 square metres, and for two adults sharing at least 10.22 square metres. A room below 4.64 square metres cannot be used for sleeping at all. These minimums are set by The Licensing of Houses in Multiple Occupation (Mandatory Conditions of Licences) (England) Regulations 2018 and apply to every licensed HMO in England. Measure every room before purchasing a property in Trafford for HMO use, as many 1930s third bedrooms are at or close to these thresholds.

How much does planning permission for an HMO in Altrincham cost?

The Planning Portal application fee for a C3 to C4 change of use is £258 in 2026. Architect and planning agent fees to prepare drawings and submit the application typically add £1,500 to £3,500. Trafford Council can refuse where HMOs already make up a high proportion of housing in an area, so confirm the existing HMO density before exchanging. Allow 8 to 13 weeks for a planning decision.

How long does an HMO conversion in Altrincham take?

Building works on a typical four to six bedroom conversion take 8 to 16 weeks depending on scope and specification. Because planning permission is required for every HMO conversion in Trafford, add 8 to 13 weeks before construction begins for the planning determination. Allow further time for the HMO licence inspection and grant once works are complete. The realistic total timeline from purchase to tenants moving in is 6 to 9 months for a straightforward project.

Can I convert a property that was already an HMO before Trafford’s Article 4 direction?

A property that was lawfully operating as a small HMO before 21 December 2017 retains its use, provided it has not since been returned to single-dwelling occupation. If the previous HMO use has lapsed, or if you want to expand occupancy into a different category, planning permission may still be required. Confirm the property’s planning history with Trafford Council’s planning team before making any investment decisions.

Cost figures are general estimates based on Renovat Construction project data and are for guidance only; actual costs depend on property size, condition, and specification. Planning Portal fees are the 2026 rate and are subject to change. Planning and licensing rules change over time; confirm the current position with Trafford Council before making any investment decisions. For an exact quote, request a free site survey.