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Interior Designers

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Interior design in a British home covers everything from a single room scheme to a whole-house refurbishment: layout, joinery, lighting, finishes, furniture and the coordination of the trades who install it all. The profession is not regulated, there is no register and no protected title, and the work ranges from an hour of colour advice to a full service where the designer specifies every item and manages the installation.

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The legal constraint most homeowners underestimate is heritage. Under section 7 of the Planning (Listed Buildings and Conservation Areas) Act 1990, no person shall execute or cause to be executed any works for the demolition of a listed building or for its alteration or extension in any manner which would affect its character as a building of special architectural or historic interest, unless the works are authorised. That wording says nothing about the outside of the building, and section 1(5) treats any object or structure fixed to the building as part of it. Panelling, staircases, fireplaces, plan form and internal doors are all in scope.

The other constraint is that an interior designer cannot sign off the notifiable parts of their own scheme. Rewiring for new lighting, moving a radiator circuit, taking out a wall or altering a flue all fall to people with their own qualifications and notification routes. A good designer knows precisely where their drawings stop and somebody else's certificate starts.

Listed building consent does not stop at the front door

Section 7 of the 1990 Act catches alteration in any manner which would affect the building's character as one of special architectural or historic interest. Because the test is about character rather than about which face of the wall you are working on, internal works are caught whenever they touch what made the building worth listing: removing or inserting internal walls, altering plan form, taking out or replacing historic doors, fireplaces, panelling, staircases and decorative mouldings, and stripping original plaster or joinery.

Section 1(5) widens it further. A listed building includes any object or structure fixed to the building, and any object or structure within the curtilage that forms part of the land and has done so since before 1 July 1948, unless the list entry says otherwise under section 1(5A). Fitted historic cupboards, shutters and overmantels are therefore part of the listing rather than furniture you can take out at will.

The penalties are unusual for a planning matter. Section 9 makes contravention of section 7 an offence, punishable on summary conviction by imprisonment for up to six months or a fine or both, and on indictment by imprisonment for up to two years or a fine or both. The defence in section 9 is narrow: works urgently necessary for safety or health or for the preservation of the building, limited to the minimum measures immediately necessary, with written notice justifying them given to the local planning authority as soon as reasonably practicable. Consent is granted by the local planning authority, and this Act applies in England and Wales — Scotland and Northern Ireland have their own listed building legislation.

The three service levels most designers actually sell

  • A consultation: a single visit with verbal advice, a written summary and perhaps a colour and material direction, with no drawings and no procurement.
  • A design-only package: mood boards, layout drawings, elevations of joinery, a lighting plan and a specification schedule, which you then hand to your own trades.
  • A full service: design plus sourcing, ordering, delivery coordination, snagging and installation day management, usually charged with a procurement element on top of the design fee.
  • Colour and material consultancy on its own, often bought by people who have already decided the layout and only need the finishes resolved.
  • Furniture, fixtures and equipment specification for a single room, which is how most people sensibly test whether they and the designer get on.
  • Contract administration is rarely included: if you want somebody inspecting the builder's work against the drawings, that is a separate appointment and must be written down.

What an interior designer cannot certify

Electrical work is the clearest line. Approved Document P, 2013 edition, which took effect on 6 April 2013 and applies in England, sets out that the installation of a new circuit and the replacement of a consumer unit must be notified to a building control body or certified by a registered competent person. A lighting scheme that adds circuits, or a refurbishment that replaces the board, is notifiable work regardless of who drew the plan.

Structure is the second. Removing an internal wall, forming an opening or altering a chimney breast is building work with its own approval route and needs an engineer's calculations; an interior layout drawing showing a knocked-through room is a proposal, not an approval. Gas appliances, flues and any work on a heating system have their own registration regimes and are covered in the heating and gas guides in this catalogue.

The honest version of an interior designer's scope is therefore: design, specify, coordinate and inspect against the design. Certify, notify and calculate belong elsewhere. Disputes on domestic refurbishments very often begin where a designer was assumed to be managing compliance that nobody had actually appointed them to manage.

How an interior design project is normally staged

  • Briefing and budget: what the rooms have to do, who uses them, what stays, and a realistic split between construction, joinery and loose furnishings.
  • Survey and existing drawings, including ceiling heights, window positions, service locations and anything the layout will have to work around.
  • Concept: layout options, mood direction and an outline specification, priced at a level that lets you say no before anything is ordered.
  • Detailed design: joinery drawings, lighting and switching plan, finishes schedule, and a room-by-room specification the trades can price.
  • Procurement: lead times drive this stage far more than price does, and bespoke joinery and upholstery are usually the long poles.
  • Installation and snagging, where the designer sequences deliveries against the builder's programme so that a sofa does not arrive before the floor is laid.

Common ways an interior scheme unravels

  • The property turns out to be listed, and features the scheme intended to remove are precisely the ones the list entry describes.
  • Lead times on bespoke joinery and imported furniture are discovered after the builder has finished, leaving a completed room standing empty for weeks.
  • The lighting plan requires new circuits that nobody priced, and the electrical notification is discovered at completion rather than at design stage.
  • The procurement mark-up was never explained, so the client cannot tell what is a design fee and what is a margin on goods.
  • Design responsibility and site responsibility are blurred: the designer thinks the builder is checking the setting-out, the builder thinks the designer is.
  • Fabric and floor finish choices ignore how the house is actually used, and the scheme looks tired within a year.

What drives an interior design quote, and how LokalMatch fits in

Interior design fees track the depth of the service and the amount of bespoke work. A room consultation is a fixed fee for a morning. A full-house scheme with joinery drawings, a lighting design and managed procurement is a project with a programme. The variables that move the number are how many rooms, how much of the design is bespoke rather than specified from stock, whether the designer is also coordinating trades, whether you want site visits during installation, and whether goods are bought through the designer or by you. Ask specifically how goods are charged, because a design fee and a procurement margin are two different things and should be shown separately.

LokalMatch does the introduction, and that is the whole of it. Post the job once with your postcode and interior designers working in your area will contact you. Using the site costs homeowners nothing; the designers pay for the enquiries they receive. LokalMatch does not do the design, does not set fees and does not vet, rank or recommend anyone, so compare the scopes and ask about listed status before you commit.

Interior Designers: frequently asked questions

Do I need listed building consent to change the inside of my house?

If the building is listed and the works would affect its character as a building of special architectural or historic interest, yes. Section 7 of the Planning (Listed Buildings and Conservation Areas) Act 1990 does not distinguish between internal and external works. Removing or inserting internal walls and altering historic doors, fireplaces, panelling, staircases and mouldings are the usual triggers. Apply to your local planning authority before anything is touched.

What happens if work is done to a listed building without consent?

Section 9 of the 1990 Act makes it an offence, punishable on summary conviction by up to six months' imprisonment or a fine or both, and on indictment by up to two years or a fine or both. The only statutory defence is urgent works necessary for safety or health or the preservation of the building, limited to the minimum immediately necessary, with written notice to the local planning authority as soon as reasonably practicable.

Are fitted cupboards and shutters part of the listing?

Very often yes. Section 1(5) treats any object or structure fixed to the building as part of the listed building, along with certain structures in the curtilage that have been there since before 1 July 1948, unless the list entry excludes them under section 1(5A). Fitted historic joinery is therefore not loose furniture you can remove at will.

Is interior design a regulated profession in the UK?

No. There is no register, no protected title and no statutory code, unlike architects, who are regulated under the Architects Act 1997. Judge an interior designer on completed projects of a similar type, a written scope, a clear statement of how goods are charged and evidence of professional indemnity insurance.

Can my interior designer arrange the electrical work?

They can coordinate it, but they cannot certify it. Approved Document P, 2013 edition, in force in England from 6 April 2013, requires installation of a new circuit or replacement of a consumer unit to be notified to a building control body or certified by a registered competent person. Ask for the certificate at the end; it is the document you will need when you sell.

Should the designer or the builder be responsible on site?

Whichever you appointed in writing. Interior design fees usually cover design, specification and coordination, not contract administration or inspection. If you want somebody checking the work against the drawings, that is a separate service and should be named in the appointment rather than assumed.

Sources

  1. Planning (Listed Buildings and Conservation Areas) Act 1990, section 7 (restriction on works affecting listed buildings), legislation.gov.uk
  2. Planning (Listed Buildings and Conservation Areas) Act 1990, section 9 (offences and penalties), legislation.gov.uk
  3. Planning (Listed Buildings and Conservation Areas) Act 1990, section 1 (meaning of listed building; fixed objects and curtilage structures), legislation.gov.uk
  4. GOV.UK: Approved Document P, electrical safety — dwellings, 2013 edition (notifiable work)

Written by the LokalMatch editorial team. Last reviewed 21 September 2026. How we write and check our guides

What interior designers can help with

Common jobs homeowners hire interior designers for:

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What affects the cost of interior design

Prices depend on the details of your project. We only publish price ranges when they’re backed by real LokalMatch quote data or reliable sources. Until then, here’s what usually changes the price:

  • Type of professional and service needed
  • Size and complexity of the project
  • Level of detail in drawings or reports
  • Number of site visits and meetings
  • Number of design revisions
  • Help with permits or contractor selection

How to compare interior designers before you hire

  • Match the professional to the job: an architect or engineer where the work requires one, a designer for layout and finishes, or an inspector for a condition report.
  • Ask whether they are licensed or certified for this type of work in your area, where that applies.
  • Review a portfolio or sample report that's similar to your project.
  • Get a written agreement that spells out the services, deliverables, number of revisions and how fees are charged.
  • Ask whether their drawings will be suitable for a permit application, and whether they'll help with it.

Questions to ask interior designers before you hire

  • Are you licensed or certified for this type of work in my area?
  • What exactly will you deliver: drawings, specifications, a report or site visits?
  • How are your fees charged: a fixed fee, hourly or based on the project cost?
  • How many rounds of revisions are included?
  • Will your drawings be ready for a permit application, and will you submit it?
  • Can I see a sample of a similar project or report?
  • Do you carry professional liability insurance?

When to call a pro for interior design

  • Before removing or moving a wall that may be load-bearing
  • Before buying a home, to understand its condition
  • When a permit application needs drawings

Interior design permits and local rules

Some interior design work needs a permit or has to meet local bylaws. Rules vary by municipality, so ask your pro whether a permit is needed and who will apply for it — and check with your city or town if you’re unsure.

Permits and licensing

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