Last Updated: 2 November 2026
Quick Summary
An office fit out cost estimate in the UK is a written forecast of what a workspace refurbishment will cost, broken down by trade, specification and allowance. Build it yourself before anyone prices the work, splitting construction, M&E, finishes, FF&E, professional fees and allowances into named lines with a low and high rate. Treat the output as a range, never a single figure.
- An estimate is a planning tool you build yourself; a quote is a fixed offer from a contractor.
- Define the specification tier first, as it is the single biggest lever on your rate per square metre.
- Add professional fees at 8% to 15% of build cost and contingency at 5% to 10%.
- Apply escalation only to the uncommitted portion of the budget, not the whole budget.
- Issue the same scope document to every contractor so quote comparisons are like for like.
Table of Contents
- Why an Early Office Fit Out Cost Estimate Decides the Project
- What Belongs in an Office Fit Out Cost Estimate
- Building Your Estimate with an Office Fit Out Cost Calculator
- Allowances Most Budgets Forget: VAT, Contingency and Inflation
- Structuring an Office Fit Out Budget Template
- Mapping the Office Fit Out Project Timeline to Your Spend
- Running an Office Fit Out Contractor Quote Comparison
- Commissioning Your Fit Out Estimate
- Frequently Asked Questions
Why an Early Office Fit Out Cost Estimate Decides the Project
An office fit out cost estimate in the UK is a written forecast of what a workspace refurbishment will cost, broken down by trade, specification and allowance.
Clients with a structured estimate tend to make faster decisions, while those with a single number from a contractor often spend months chasing variations.
An estimate is not a quote. A quote is a fixed offer; an estimate is a planning tool you build yourself before anyone prices the work.
What Belongs in an Office Fit Out Cost Estimate
A complete office fit out cost estimate covers construction, building services, finishes, furniture, professional fees and allowances. Miss a category and the gap comes back as a variation later.
The Royal Institution of Chartered Surveyors guidance on construction cost management is clear that early estimates should state their assumptions. Every line in your estimate needs a scope note beside it.
Split your estimate into these groups:
- Construction and building works: partitions, ceilings, doors, decoration, structural alterations
- Mechanical and electrical services (M&E): power, lighting, data cabling, ventilation, heating and cooling
- Finishes: flooring, wall treatments, joinery, solid surface, metalwork
Construction, Building Works and M&E
Construction covers the physical envelope: stud partitions, suspended ceilings, glazing, doors and decoration. M&E covers everything that makes the space work, from power outlets to data cabling and comfort cooling.
These two categories carry the biggest swing in any estimate. A basic specification with retained ceilings and painted walls costs far less than a high specification with new metal ceilings, feature joinery and full comfort cooling.
Watch out: M&E is where budgets leak. Treat building services as a single lump and you will not spot the gap between a like-for-like swap and a full rewire until the quote lands.
Furniture, Fixtures, Equipment and Professional Fees
FF&E is everything you take with you when you leave: desks, task chairs, soft seating, storage, screens and AV kit.
Design fees and project management are easy to forget because they arrive as invoices, not build costs.
Price FF&E separately from the build: furniture and build lead times rarely match, and separating them keeps your programme honest.
Building Your Estimate with an Office Fit Out Cost Calculator
An office fit out cost calculator multiplies your floor area by a rate per square metre, then adds allowances. It gives a starting range, not a final number.
Here is how to build one yourself in a spreadsheet:
- Measure the net internal area in square metres
- Choose a specification tier: basic, mid-range or high
- Apply a rate per square metre for each trade group
- Add professional fees as a percentage of build cost
- Add contingency and VAT
- Compare the total against your budget ceiling
Treat the output as a range, never a single figure. Rates vary by region, building condition and specification, so quote a low and high rate for each line.
Specification tiers and what they change
A specification tier is a shorthand for the quality and extent of what you install. It is the single biggest lever on your rate per square metre, so define it before you price anything.
- Basic: retain existing ceilings and services where possible, painted plasterboard partitions, vinyl or carpet tile flooring, standard suspended ceiling grid, like-for-like M&E alterations, catalogue task seating and bench desking.
- Mid-range: new suspended ceilings with integrated lighting, some glazed partitions, feature flooring in reception and meeting rooms, comfort cooling to meeting rooms, mid-range task chairs and desking with cable management.
- High: metal or acoustic ceilings, full-height glazing and feature joinery, solid surface and metalwork, full comfort cooling, integrated AV in every meeting room, ergonomic task seating and bespoke desking.
The gap between basic and high tiers can be substantial once M&E, joinery and AV are included. A single headline rate is misleading unless the tier is stated beside it.
A worked example you can copy
Take a 500 square metre office in an existing building, mid-range specification, with retained perimeter glazing and a new reception. Build the estimate line by line:
| Trade group | Quantity | Basis | Low rate | High rate |
|---|---|---|---|---|
| Construction and partitions | 500 m² | per m² | £X | £Y |
| Suspended ceilings and lighting | 500 m² | per m² | £X | £Y |
| M&E alterations | 500 m² | per m² | £X | £Y |
| Flooring | 500 m² | per m² | £X | £Y |
| Decoration | 500 m² | per m² | £X | £Y |
| Reception and joinery | 1 item | lump sum | £X | £Y |
| FF&E | 60 desks | per desk | £X | £Y |
| Professional fees | % of build | percentage | 8% | 15% |
| Contingency | % of build | percentage | 5% | 10% |
| VAT | % of total | percentage | 20% | 20% |
Fill the rate cells from current contractor feedback, not a single online figure. Ask two or three contractors for indicative rates against the same tier and scope note.
Watch out: a calculator that returns one number encourages you to treat it as a budget. Carry the low and high columns through to the total and present the range to your board or landlord.
Adjusting for region and building condition
Rates are not uniform across the country: labour availability, travel and local market conditions move the number.
Building condition matters as much as geography. A shell with no services costs more to fit out than a recently refurbished floor with usable ceilings and a working cooling system.
The Health and Safety Executive guidance on construction project roles is worth reading before you fix your scope. Projects involving structural change carry duties that affect cost and programme.
Turning the calculator into a comparable brief
Your calculator output is only useful if it becomes a brief contractors can price against. Convert each row into a scope note stating what is included and excluded, that brief is what you issue to market and what makes like-for-like comparison possible later.
A transparent estimate with stated inclusions, a named specification tier and a low-to-high range beats a precise-looking single figure. It tells everyone what has been assumed and where the risk sits.
Allowances Most Budgets Forget: VAT, Contingency and Inflation
Three allowances decide whether your estimate survives contact with reality: VAT, contingency and inflation. Most early budgets include the first two badly and ignore the third entirely.
VAT and recovery
Commercial fit out work is generally subject to VAT. The critical question is not the rate but whether your business can recover the VAT. If you are VAT-registered and the workspace is used for taxable business activity, you generally recover input VAT and should budget net.
Watch out: mixed-use buildings and landlord contributions can split the VAT treatment. Confirm the position with your accountant before you fix the budget ceiling, not after the first invoice.
Sizing contingency by risk, not by habit
Contingency is not slack. It is the money that stops a surprise from becoming a delay. Set it as a percentage of build cost, but let the percentage reflect what you know about the building.
- New or recently refurbished space with full services drawings: a lower contingency is defensible because the unknowns are fewer.
- Older building with no services drawings or an unconventionally serviced floor: a higher contingency is prudent because the survey has not yet found everything.
- Listed or conservation-area building: add a separate allowance for approvals and specialist trades, because consent conditions can change the specification.
Draw contingency down openly and report what you spent it on. Track it as a separate line from day one and release it only at agreed gates, after survey, after tender return and at practical completion.
Inflation and escalation on a long programme
Materials and labour prices move. On a short programme the effect may be small, but on a long one, or where you are procuring in phases, add an escalation line: apply a percentage per annum to the uncommitted portion of the budget from the date of the estimate to the expected date of spend.
Do not apply escalation to the whole budget. Money already committed under a fixed-price contract is not exposed. Escalation belongs on the lines you have not yet bought.
Programme, phasing and cost control
Timing affects cost as much as specification. Phased works, out-of-hours working and occupied-building constraints all add cost by reducing productivity and requiring protection, security and temporary services.
Change control is the other half of cost control. Every change after the scope is fixed should be priced, recorded and approved against the contingency before it is instructed.
Sustainability, reuse and lifecycle
Upfront cost is only part of the picture. Reusing existing ceilings, raised floors, furniture and finishes can reduce both spend and waste, though it may increase survey and making-good work.
Price reuse and lifecycle options as alternatives beside the base estimate, so decision-makers can see the trade-off between capital and running cost rather than treating sustainability as an add-on.
A checklist for the allowance lines
Before you present the estimate, confirm each of these is a named line with a stated basis:
- VAT treatment and recovery position confirmed
- Contingency sized to building risk and ring-fenced
- Escalation applied only to uncommitted spend
An estimate that carries these allowances openly is defensible in front of a board, a landlord or a lender. One that buries them in a single percentage is not.
Structuring an Office Fit Out Budget Template
An office fit out budget template is a spreadsheet with one row per cost line and columns for scope, rate, quantity, total and notes. The structure matters more than the software.
Build your template with these columns:
| Column | What It Holds |
|---|---|
| Cost category | Construction, M&E, finishes, FF&E, fees |
| Scope note | Exactly what is included and excluded |
| Quantity | Square metres, units or linear metres |
| Rate | Cost per unit |
| Total | Quantity multiplied by rate |
| Allowance | Contingency, VAT, inflation |
| Status | Estimated, quoted or confirmed |
Two rules keep the template honest. First, every row carries an inclusion and exclusion note. Second, the status column shows whether a figure is your estimate or a contractor's quote.
Mapping the Office Fit Out Project Timeline to Your Spend
An office fit out project timeline runs from feasibility through design, procurement, construction and handover.
Early stages cost little but commit most of the money. Design decisions lock in specification, and specification drives cost.
The UK government guidance on public procurement and value for money sets out the principle clearly: define requirements before you go to market.
Link your spend profile to milestones. Release contingency only at agreed gates, and review the estimate at each one.
Running an Office Fit Out Contractor Quote Comparison
An office fit out contractor quote comparison only works when every quote prices the same scope. Otherwise you are comparing different projects and calling it a discount.
Do this before you compare:
- Issue the same scope document to every contractor
- Ask each to state inclusions and exclusions in writing
- Confirm whether M&E, joinery and finishes are in-house or subcontracted
Anderston Group carries all trades in-house and uses an AI-native project management engine to track programme and cost.
For a design-led contractor covering commercial and leisure fit-outs, you can see the fit-out services Anderston Group offers. If you are weighing up contractors covering different areas, this design-led interior fit-out capability and fit-out coverage for projects across the central belt show what is delivered in-house.
Commissioning Your Fit Out Estimate
Commissioning an office fit out cost estimate means briefing a contractor with your scope, programme and budget range, then asking for a priced response against it.
Bring three things to the first meeting:
- Your completed budget template
- A floor plan with net internal area marked
- Your target occupation date and any lease constraints
Expect questions about dilapidations, reinstatement and landlord approvals, as these affect cost and programme.
To move from spreadsheet to priced estimate, review the design-led fit-out service and get in touch.
Building a defensible estimate takes an afternoon and can save considerable argument later.
Frequently Asked Questions
How do you estimate the cost of an office fit-out?
Start with the measurable scope: floor area, the number of workstations and meeting rooms, and whether the space is shell and core or already part-fitted. Build the estimate from measured quantities rather than a single rate, separating construction and building works, mechanical and electrical services, partitions, ceilings, flooring, joinery, and furniture, fixtures and equipment. Add design and professional fees, then layer on VAT, contingency and an inflation allowance. A measured estimate gives you a defensible office fit out cost figure you can test quotes against.
What factors affect office fit-out costs most?
Specification drives most of the variation: basic, mid-range and high-specification finishes can differ substantially for the same layout. Building condition matters just as much, because an older or listed property may need structural work, upgraded building services or landlord consents before any finishes go in. Density of occupation, the amount of data cabling and AV, and whether the space needs a full Cat A or Cat B scope all move the number. Programme length also affects cost through preliminaries and site management.
How much contingency should you include in an office fit-out budget?
Contingency should reflect how much is unknown at the point of estimating. A straightforward Cat B fit-out in a well-surveyed building needs a smaller allowance than a refurbishment in an older property where the services and structure have not been opened up. Most budgets carry a risk allowance that steps down as the design develops and surveys confirm assumptions. Keep contingency as a separate line so it is visible, and release it formally rather than letting it be absorbed silently into the base estimate.
How do you compare office fit-out contractor quotes fairly?
Insist on like-for-like scope. Ask each contractor to price the same schedule of works, then check what is excluded: builders' work, M&E upgrades, fire alarm alterations, data cabling, furniture, making good, waste removal and dilapidations. Compare the qualifications attached to each quote, the proposed programme, the payment terms and who carries design responsibility. A lower headline figure often reflects a narrower scope. Normalise every quote to the same inclusions before you compare the office fit out cost.
