home_repair_service Renovation Estimating

House Renovation Cost Estimates UK

Renovation projects overrun more than any other type of construction work. Not because of bad luck, because most go to site without a properly defined scope or a professional cost plan. We fix that before the first contractor sets foot on your property.

check Full house, partial and phased renovations
check Structural, M&E, finishes, all included
check Provisional sums for unknown risk clearly stated
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±5%
Estimate Accuracy
10–48
Days Turnaround
3,000+
Projects Costed
House renovation project in progress UK

Why Renovation Budgets Overrun More Than Any Other Project

New builds are predictable. Extensions are mostly predictable. Renovations, especially on older properties, carry a level of unknown that no online calculator can account for. You strip back a wall and find rot. You lift a floor and discover the joists need replacing. You open up a ceiling and the wiring is forty years old and nowhere near current regulations.

None of that is unusual. In our experience, it's the norm on properties built before the 1980s. The problem isn't that these things happen, it's that most renovation budgets don't account for them. A builder quotes on what's visible. A professional cost plan includes properly defined provisional sums for what isn't, so when something unexpected turns up, it's already inside the budget framework rather than arriving as a shock invoice.

That's the fundamental difference between a contractor quote and a professional estimate. One prices what's in front of them. The other prices the whole project, including the risks that are known to exist even if their exact cost isn't yet fixed.

Our residential construction cost estimating service covers renovations from light refurbishment through to full structural overhauls, wherever you are in the UK.

What we do differently: we separate defined costs (things we can measure and price accurately) from provisional sums (known risks with uncertain scope), and we label each clearly. You always know exactly what's confirmed and what might move, rather than finding out mid-project.

construction

Light Renovation

Redecoration, new flooring, kitchen and bathroom replacement, minor electrical and plumbing updates, works that don't affect structure

engineering

Mid-Level Renovation

Layout changes, structural wall removals, full rewire, new central heating, window replacement, replastering throughout

foundation

Full Structural Renovation

Back-to-brick or back-to-structure overhaul, damp treatment, roof replacement, floor structure repairs, full M&E replacement and remodel

The Hidden Costs Most Renovation Budgets Miss

These are the items that routinely turn up after work starts, and push projects over budget. We account for all of them from the start.

Structural Investigations

Older properties often hide subsidence repairs, inadequate lintels over openings, or floor joists that look fine until they're exposed. We include investigation allowances where the condition is unknown.

Damp and Timber Treatment

Rising damp, penetrating damp, or wet rot in timber, particularly common in pre-1950 properties. Treating and repairing this properly is a significant cost that rarely appears in early quotes.

Full Rewire

Properties with original wiring, whether rubber-insulated, aluminium, or ungrounded systems, need a complete rewire before occupation. This is non-negotiable and should always be in the budget.

Heating System Replacement

A renovation is the right time to replace an ageing boiler and radiator system, or to switch to a heat pump with underfloor heating, but the cost needs to be planned from day one, not added on later.

Roof and External Envelope

Failing flat roofs, slipped slates, inadequate insulation, and failed window seals, external envelope work is expensive and often deferred. When it's needed, it has to be in the budget.

Skip Hire and Strip-Out

Taking a house back to structure generates significant waste. Strip-out labour, scaffolding, and skip hire are real costs that many budgets treat as an afterthought. We cost them from the start.

How We Build a Renovation Cost Plan

Every renovation estimate we produce follows the same four-stage process, regardless of project size.

1

Scope Review

We review your drawings, any existing survey reports, and your brief. Where drawings don't exist, common for older properties, we work from photographs and a detailed scope of works description.

2

Elemental Breakdown

We price the project element by element, strip out, structure, M&E, finishes, so you can see exactly where your money is going and make informed decisions about specification and phasing.

3

Risk and Provisional Sums

We identify the unknown risks specific to your property and assign provisional sums against each, defined where possible, undefined where not. These sit inside your budget, not outside it.

4

Tender-Ready Document

The finished estimate is formatted so contractors are pricing the same scope. Quote returns become directly comparable, and low quotes are genuinely low, not missing half the work.

House Renovation Estimating FAQs

Can you estimate a renovation without architectural drawings?expand_more
Yes, renovation estimates often have to be produced without full architectural drawings, particularly at feasibility stage or for properties being purchased at auction. We can work from a detailed written scope of works, photographs, and floor plan sketches. The estimate will be clearly labelled with the assumptions made and what information would improve the accuracy further. For anything structural, wall removals, structural openings, underpinning, we'll flag where a structural engineer's input is needed before costs can be fixed.
We're buying a property to renovate and need a figure before exchange, can you help?expand_more
This is one of the most common situations we work with. A pre-purchase renovation estimate lets you know whether the numbers stack up before you're committed. We produce these regularly for buyers, investors, and developers working to an auction deadline or a fixed exchange date. Send us the property details, the survey report if you have one, and your intended scope, we can typically turn this around in 3–5 days.
What's the difference between a renovation estimate and a refurbishment estimate?expand_more
In practical terms, refurbishment usually means cosmetic and services updates, new kitchen, bathroom, decoration, floor finishes, without touching structure. Renovation typically involves structural changes: wall removals, floor or roof repairs, damp treatment, full rewire, layout remodelling. The estimating approach is different because renovation carries significantly more unknown risk, which needs to be accounted for through provisional sums. We handle both, and we're clear upfront about which approach applies to your project.
Can we phase the renovation and get costs for each phase separately?expand_more
Absolutely, phased renovation is something we cost regularly. We produce an overall project estimate and then break it down by phase, showing the cost of each stage independently. This is useful for cash-flow planning, for phasing work around occupancy, or for approaching lenders with a staged draw-down structure. We make sure the phasing makes practical sense too, flagging where certain works need to happen in a specific order to avoid rework costs later.
We're renovating and adding an extension at the same time, do you combine these?expand_more
Yes, and a combined estimate is almost always more useful than two separate documents. When a house extension and renovation happen simultaneously, the scaffolding, preliminaries, and contractor mobilisation costs are shared, which changes the economics of both scopes. We produce a single elemental breakdown that keeps the extension and renovation costs clearly visible as separate line items within one overall project budget.

Related Residential Estimating Services

Don't start your renovation without a proper cost plan

Send us your drawings, survey report, and brief. We'll review your project and come back within 10 hours with a clear scope and turnaround time.

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