In 2026, a realistic construction-only budget for a bespoke new home in Sussex is roughly £2,200 to £3,200 per m², while complex or premium projects may reach £3,200 to £4,000+ per m². That means a 140m² house could cost about £308,000 to £448,000 for the main build, or approximately £390,000 to £600,000 before land and finance once design fees, surveys, approvals, utility connections, external works and contingency are included. So, how much does it cost to build a house? The final figure depends less on bedroom count than on floor area, site conditions, design complexity, specification and how the project is managed.
Sussex New Build Costs at a Glance
Recent UK self-build guidance places a typical 2026 build at around £2,500 to £3,000 per m², with straightforward schemes potentially lower and premium projects moving well beyond £3,200 per m². South East architect-designed homes can also pass £4,000 per m² where detailing, glazing, structural complexity or luxury finishes are substantial.
The following ranges provide a practical starting point for house building costs in Sussex. They are budgeting figures rather than quotations.
| Build level | Indicative construction cost | What it usually represents |
| Cost-conscious, straightforward design | £2,200–£2,600 per m² | Compact footprint, simple roof, standard materials and controlled choices |
| Standard bespoke new build | £2,600–£3,200 per m² | Good-quality finishes, efficient systems and some customised features |
| Premium or technically complex build | £3,200–£4,000+ per m² | Bespoke glazing, complex structure, high-end finishes or difficult site conditions |
These figures normally exclude the plot, finance costs and several pre-construction expenses. They may also exclude landscaping, unusual service connections, major retaining structures and specialist ecological or drainage work.
VAT treatment needs to be checked item by item. Qualifying construction services for a new dwelling may be zero-rated, while professional fees and certain products or works can still attract VAT.
A local builder can refine the range once there is a measured design, an outline specification and enough site information. Sussex County Construction offers new builds in Sussex from early planning through to construction and handover. Its service covers bespoke homes across Worthing, Brighton, Shoreham-by-Sea, Lancing, Littlehampton, Bognor and Chichester.
What Does the Cost to Build a House Actually Include?
A square-metre rate is useful for early planning, but it can become a trap if two people use the same number to describe different scopes.
One estimate may cover a weather-tight shell. Another may include the kitchen, bathrooms, flooring and decoration. A third may include professional fees, drainage and landscaping.
Before comparing quotations, ask each contractor to define the exact boundary of the build cost.
A reasonably complete main construction price may include:
- Site setup, welfare, scaffolding and temporary protection
- Groundworks, foundations, drainage and the structural frame
- External walls, insulation, roofing, windows and external doors
- Plumbing, electrics, heating, ventilation and hot-water systems
- Internal walls, plastering, joinery, bathrooms and agreed kitchen allowances
- Flooring, decoration, testing, certification and final completion work
Even a detailed building quotation may not include land, Stamp Duty Land Tax, legal costs, planning consultants, architects, engineers, building control, utility upgrades, landscaping, loose furniture or borrowing costs.
The exclusions page deserves as much attention as the total at the bottom.
The safest approach is to separate the budget into three pots: land acquisition, construction, and everything surrounding the construction. That final pot is where many early estimates spring a leak.
Worked New Build Budgets by House Size
The table below uses a broad £2,200 to £3,200 per m² construction range, then adds an indicative allowance for professional services, surveys, approvals, utilities, external works and contingency. Land and finance are excluded.
| Approximate floor area | Main construction budget | Broader project allowance before land |
| 100m² | £220,000–£320,000 | £280,000–£430,000 |
| 140m² | £308,000–£448,000 | £390,000–£600,000 |
| 180m² | £396,000–£576,000 | £500,000–£780,000 |
| 220m² | £484,000–£704,000 | £610,000–£950,000 |
The broader allowance is not a fixed percentage rule. A small house on a difficult plot can have a surprisingly high cost per square metre because site setup, design, utility connections and professional work do not shrink in direct proportion to floor area.
A larger home with a simple rectangular plan may benefit from better economies of scale.
Use gross internal floor area consistently when comparing estimates. Garages, basements, balconies and detached outbuildings should be priced separately because they have different construction demands.
The Full Budget: Costs Beyond the Building Contract
The main contractor’s price is only one slice of the project. A credible estimate cost of construction should account for the following categories before you decide whether a plot or design is affordable.
Land Purchase, Legal Work and Finance
Land prices vary dramatically across Sussex. A serviced plot with planning permission in an established area may command a premium, while a cheaper plot can bring greater planning, access, drainage or utility risk.
The purchase budget may need to include Stamp Duty Land Tax, conveyancing, searches, specialist lending fees, valuations and insurance. If you will be paying rent or a mortgage elsewhere during the build, carrying costs should also appear in the plan.
Do not assume that a low asking price represents a bargain. A plot requiring demolition, contamination treatment, retaining walls, a long access road or major utility work can transfer the saving directly into the construction column.
House Designer Cost and Professional Fees
The phrase “house designer cost” can refer to an architect, an architectural technologist, a design-and-build company or a wider consultant team. The service may stop at planning drawings, or continue through technical design, tendering, site inspections and handover.
For a bespoke new house, a full architectural service is often priced as a percentage of construction cost, while limited design stages may be offered for a fixed fee.
A 2026 UK benchmark for a new home with a £500,000 build cost places a full architect’s fee at around 9%, although the actual percentage depends on project size, complexity and appointment scope. RIBA also explains that fees are commonly divided across feasibility and planning, technical design, and construction-to-handover stages.
The wider professional team may include a structural engineer, quantity surveyor, planning consultant, energy assessor, ecologist, arboricultural consultant, drainage designer, party wall surveyor and principal designer.
As an early allowance, many clients reserve around 10% to 15% of construction cost for professional input, with more for difficult or highly detailed schemes. This is a planning assumption rather than a universal fee scale.
Surveys and Site Investigation
A measured topographical survey is usually needed before the design is developed properly.
Depending on the plot, further work may include a soil investigation, drainage survey, tree survey, ecology report, flood-risk assessment, utilities search or contamination investigation.
Spending money on surveys can feel premature when no walls have been built. In practice, this work replaces guesswork with evidence.
Discovering weak ground, protected trees or an inadequate drainage route after planning or after work begins is far more disruptive.
Planning Permission and Related Requirements
For planning applications submitted in England from 1 April 2026, a full application to create fewer than ten dwellings carries a fee of £610 per dwelling.
Online submissions attracting a fee over £100 also carry a Planning Portal service charge of £75.83 plus VAT. Local advice, pre-application services, specialist reports and condition-discharge fees are separate.
Planning cost is not limited to the application fee. A sensitive site may require design revisions, landscape proposals, ecological evidence, heritage input or additional consultation.
Conditions attached to an approval can create work before construction starts and again before the home is occupied.
Biodiversity requirements also need early attention. The self-build and custom-build exemption from mandatory Biodiversity Net Gain is scheduled to end for new planning applications made after 6 August 2026. Qualifying projects may therefore need additional ecological assessment, habitat proposals or other measures that affect the design and budget.
Some Sussex authorities operate the Community Infrastructure Levy. A self-build exemption may be available when the legal criteria and procedural deadlines are met, including where an individual commissions a contractor to build their main home.
The paperwork must be handled correctly before work starts. Eligibility should never be assumed after construction has begun.
Building Regulations and Technical Compliance
Planning permission decides whether the development is acceptable in planning terms. Building Regulations deal with how the house must perform and be constructed.
A new home must address structure, fire safety, ventilation, drainage, sanitation, electrical safety, accessibility and energy performance.
Building control fees vary by authority or approved inspector, project value and complexity, so obtain a project-specific quotation rather than copying a fee from another council area. The government’s Approved Documents provide the main guidance used to demonstrate compliance in England.
Technical design is not paperwork sprinkled on top of a finished concept. It shapes wall build-ups, insulation, airtightness, ventilation, structural openings, drainage falls, service routes and many other details that determine price and buildability.
Groundworks, Foundations and Retaining Structures
Foundations can consume far more of the budget than their lack of glamour suggests. Soil conditions, nearby trees, slope, groundwater, made ground and access for excavation machinery all matter.
A level, accessible plot with predictable bearing conditions is generally easier to price. A sloping site may require stepped foundations, retaining structures or more complex drainage.
Coastal exposure can influence material selection and detailing. Rural plots may involve longer service runs, while tight urban sites can increase labour, deliveries, storage and waste-removal costs.
A provisional foundation allowance should be treated cautiously until the structural engineer has reviewed ground information. The cost plan becomes stronger once the team knows what sits below the grass, not merely what appears above it.
Utilities, Drainage and Connections
Electricity, water, foul drainage, surface-water drainage and telecommunications need confirmed routes and capacities.
Gas may not form part of an all-electric new home, but heat pumps, solar generation, batteries and electric vehicle charging can change the electrical design and incoming supply requirements.
A plot advertised as “near services” is not necessarily inexpensive to connect. Road crossings, reinforcement of local networks, pumping systems, treatment plants or long trenches can add five-figure sums.
Ask providers for budget quotations early. Also confirm who will excavate, install ducts, coordinate inspections and reinstate roads or boundaries. A connection price rarely tells the whole story by itself.
Kitchens, Bathrooms and Interior Finishes
Specification is one of the strongest budget levers. The structure of two houses may be similar, yet their final prices can separate sharply through glazing, cabinetry, sanitaryware, flooring, lighting, ironmongery and joinery.
Create realistic allowances rather than choosing a single “finish level” label.
A kitchen budget should state whether it includes appliances, worktops, installation, lighting and utility-room cabinetry. Bathroom allowances should cover sanitaryware, brassware, screens, tiling and fitting.
Decisions made late tend to be more expensive. They can cause rushed purchasing, substitutions, rework or programme delays.
A detailed finishes schedule lets the cost plan grow bones before the build begins.
External Works and Landscaping
Driveways, paths, terraces, walls, fencing, gates, planting, turf, external lighting, drainage features and bin or cycle storage may sit outside the house quotation.
These items are highly visible at completion and difficult to ignore indefinitely.
External works can also be required by planning conditions. A landscape scheme, ecological enhancement, permeable paving or specific boundary treatment may be part of the approved development rather than an optional finishing flourish.
Contingency
A contingency is not a spare pot for upgrades. It protects the project from uncertainty.
For a well-designed new build on an investigated site, a 10% construction contingency is a reasonable early starting point. A project with incomplete surveys, planning uncertainty, unusual structure or difficult access may need 12% to 15% or more.
Reduce contingency only when uncertainty has genuinely been removed through design, investigation and firm pricing. Crossing your fingers is not value engineering. It is a budget wearing a paper hat.
Why House Building Costs Vary Across Sussex
National averages are useful, but Sussex is not a single construction market. The same design can price differently in Worthing, Brighton, Chichester or a rural village because the plot, access, planning context and supply chain change.
Local residential cost guidance highlights several South East pressures, including higher trade demand, constrained access, heritage considerations and structural unknowns. Those issues do not affect every new build, but they explain why a Sussex estimate may sit above a bare national average.
Restricted Access and Site Logistics
A narrow road, limited parking or a plot behind an existing property can influence almost every stage.
Materials may need smaller deliveries. Excavated soil may take longer to remove. Cranes, concrete pumps and scaffolding may require permits or special planning.
Preliminaries are the cost of keeping the project functioning: supervision, welfare, temporary services, security, protection, plant and logistics. They can rise without adding a single square metre to the finished house.
Planning Context and Landscape Sensitivity
Parts of Sussex include conservation areas, protected landscapes, historic settings and sensitive rural edges. A design may need particular materials, roof forms, landscape treatment or visual assessment.
The response should not be to budget for refusal. It should be to obtain planning and design advice before spending heavily on a scheme that conflicts with the site.
Early engagement can turn planning constraints into design parameters rather than late-stage surprises.
Shape, Structure and Glazing
A compact two-storey rectangle is usually cheaper per square metre than a sprawling single-storey plan with many corners.
Complex roof geometry, large cantilevers, basements and wide unsupported openings increase design and construction input.
Large areas of glass can affect structural support, overheating analysis, energy calculations, installation equipment and internal comfort. The window quotation is only one branch of that cost tree.
Labour, Materials and Programme
House building costs UK-wide respond to labour availability, material prices and contractor workload. A delayed start can expose a project to new quotations or expired supplier prices.
A realistic programme also protects cost. Trades need clear information before their work begins.
If drawings, decisions or products arrive late, labour can be resequenced or lost, and the site clock keeps ticking.
How to Keep a Sussex New Build on Budget
Cost control is most effective before construction, while lines on a drawing can still move without a breaker, skip and invoice.
- Set a total project ceiling before finalising the size of the house
- Keep the building form compact and avoid unnecessary corners or roof changes
- Complete surveys before fixing structural and drainage assumptions
- Prepare a written specification so every tender prices the same work
- Select key finishes and long-lead products before they affect the programme
- Review cost changes formally rather than approving small upgrades one by one
Cheaper is not always lower cost. Removing technical design, choosing an unsuitable contractor or buying products without installation support can create rework.
The better target is value: money spent where it improves performance, durability, daily use or planning success.
A quantity surveyor can be valuable on larger or more complex projects. Their role is not simply to produce a number at the start. Cost planning, tender comparison, valuation of work and change control can keep the financial picture visible throughout construction.
Choosing a Build Route
The route used to procure and manage the house affects price certainty, workload and control.
| Build route | Budget characteristics | Best suited to |
| Main contractor, traditional contract | Competitive tender possible after detailed design; changes can be expensive | Clients wanting independent design and formal contract administration |
| Design and build | One team coordinates design and construction; scope must be clearly documented | Clients seeking a more integrated service |
| Self-managed build | Potential saving on contractor overhead, but high time and coordination demand | Experienced clients able to manage trades, safety and sequencing |
| Package or system build | Greater predictability for the structural system; site and finishing costs remain | Clients comfortable working within a defined construction method |
Sussex County Construction presents itself as a family-run, all-in-one building company that manages projects from planning through to completion, with communication and transparency forming part of its approach.
You can read more about Sussex County Construction and review its wider Sussex building services before deciding which delivery route suits your project.
Frequently Asked Questions
How much does it cost to build a house in Sussex in 2026?
A practical construction-only range is around £2,200 to £3,200 per m² for straightforward to standard bespoke homes.
Premium designs, difficult sites and high specifications can cost £3,200 to £4,000+ per m². Add professional fees, surveys, approvals, utilities, external works and contingency before treating the figure as a full project budget.
How much to build a house in the UK without buying land?
Current UK guidance places many bespoke self-build projects around £2,500 to £3,000 per m², with lower figures possible for simple, carefully managed projects and much higher costs for premium work.
Regional labour, design, site conditions and specification can shift the result substantially.
Is it cheaper to build a house or buy one in Sussex?
It depends on the plot price, planning status, size and quality of the proposed home.
Building can provide better control over layout and energy performance, but land, finance, professional fees and site risk may remove an apparent saving. Compare the completed project cost with similar finished homes, not the construction contract alone.
What is the biggest cost when building a new home?
The main construction contract is usually the largest controllable cost. Within it, structure, building envelope, services and internal finishes carry significant weight.
Land can exceed the build cost in high-value locations, while abnormal groundworks may dominate a difficult plot.
How accurate is a cost-per-square-metre estimate?
It is useful at feasibility stage but cannot account fully for site conditions, design geometry, specification or exclusions.
Accuracy improves once there are planning drawings, technical information, surveys, a room-by-room specification and contractor or quantity surveyor pricing.
Should I include VAT in my new build budget?
Yes, but do not apply one VAT assumption to the entire project.
Qualifying construction work on a new dwelling may be zero-rated, while design fees, consultancy, some materials, certain appliances and other work can remain taxable. Ask every supplier to state the VAT position clearly in writing.
How much contingency should I allow?
Allow around 10% of construction cost for a well-developed new build, and consider 12% to 15% where surveys, planning conditions, ground risk or design details remain unresolved.
Contingency should fall as uncertainty is replaced by information, not simply because the target budget feels uncomfortable.
Build a Budget Around the Whole Project
The most reliable answer to “how much does it cost to build a house?” begins with a realistic Sussex rate per square metre, but it does not end there.
Land, professional input, planning, technical compliance, ground conditions, connections, finishes, external works and contingency all shape the amount needed to reach handover.
Start with the total amount you can safely commit. Test the plot before becoming attached to a design. Give the project team a clear specification and ask every quotation to state its inclusions, exclusions, VAT treatment and assumptions.
For a site-specific discussion, you can contact the Sussex County Construction team to review your plans, priorities and likely construction scope. A measured evaluation based on the actual plot will always be more dependable than a national average floating loose on the internet.
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