Writing a Brief for a New-Build Home

A well-written brief is the single most valuable document you can give your architect at the start of a new-build residential project. It sets out what you need, what you value, and what constraints the design must work within. Without a clear brief, the design process drifts, options multiply, and decisions take longer than they should. With a good brief, your architect can focus their creative energy on solving the right problems from day one.

Why the Brief Matters

Designing a new home is a complex process with thousands of decisions. Your architect needs to understand your priorities so that they can make well-judged choices throughout the design, not just at the big set-piece moments but in the countless smaller decisions that shape how a building feels and works.

A brief is not a wish list. It is a structured document that describes what you need the building to do, how you want it to feel, what practical constraints exist, and how much you can spend. The best briefs are honest about priorities and trade-offs. Saying that everything is equally important is the same as saying nothing is important — it gives your architect no basis for making design decisions on your behalf.

The Accommodation Schedule

The core of any residential brief is the accommodation schedule: a room-by-room list of the spaces you need, with notes on their size, function, and any special requirements. For a new-build house, this might include the number of bedrooms and which need en-suite bathrooms, reception rooms and how they will be used, kitchen and dining requirements including how you cook and entertain, home office or studio space, utility and storage rooms, garage or car parking, and external spaces including gardens, terraces, and any outbuildings.

For each space, note anything that goes beyond the obvious. If you work from home full-time, your study is not a spare bedroom with a desk — it needs proper acoustic separation, good natural light, and dedicated services. If you have a large book collection, your living room needs wall space rather than floor-to-ceiling glazing. If you have young children, the kitchen needs a sightline to the garden.

Be specific about numbers and dimensions where you have a view, but avoid being overly prescriptive about layout. Your architect will develop the spatial arrangement, and they may find better solutions than you have imagined. What matters at brief stage is a clear understanding of what each space needs to achieve.

Room Relationships and Adjacencies

Beyond the list of individual rooms, your brief should describe how spaces relate to each other. Which rooms need to be close together? Which should be separated? How do you move through the house in daily life?

For example, you might specify that the kitchen should connect directly to the garden for outdoor dining, that the main bedroom should be away from children's rooms for privacy, that the utility room should be adjacent to the kitchen, or that the home office should have a separate entrance so that clients do not walk through your living space.

These adjacency requirements give your architect the framework for organising the plan. They are often more useful than fixed room sizes because they describe how you actually want to live in the building.

Site Constraints

A new-build project is shaped as much by its site as by the client's wishes. Your brief should include everything you know about the site constraints, or at least flag the areas where investigation is needed.

Key site information includes the plot boundaries and dimensions, orientation and aspect — where is south, what are the views, existing trees and vegetation, particularly any subject to preservation orders, access arrangements including vehicle access and pedestrian routes, neighbouring buildings and their relationship to your site, topography and ground levels, known ground conditions and any contamination risk, and flood risk classification.

In the Hampstead area, site constraints are often significant. Plot sizes tend to be modest by new-build standards, mature trees are common, and the local planning context is demanding. Conservation area status, proximity to the Heath, and the established character of surrounding streets all influence what can be built. Your brief should acknowledge these realities rather than ignoring them.

Budget Framework

Your architect needs to understand your budget from the outset. This does not mean providing a single fixed number with no flexibility. It means being clear about the overall budget envelope, how much contingency you are comfortable with, whether the budget includes everything such as professional fees, surveys, furniture and landscaping or just construction cost, and your priorities if the design needs to be value-engineered.

For a new-build house in north London, construction costs currently range from roughly £3,000 to £5,000 per square metre depending on specification, with high-end projects exceeding that significantly. Professional fees, surveys, planning costs, and other soft costs typically add 15 to 20 per cent on top of the construction cost.

Being upfront about budget allows your architect to design within realistic parameters. There is no point developing a scheme that costs twice what you can afford, however beautiful it might be on paper. A good architect will tell you what is achievable within your budget and help you prioritise where to invest for maximum impact.

Sustainability Targets

New-build projects offer the best opportunity to incorporate sustainability measures from the ground up, rather than retrofitting them later. Your brief should set out your ambitions in this area, whether that means meeting a specific standard like Passivhaus, targeting a particular energy performance level, incorporating renewable energy systems, or simply ensuring the building is well insulated and energy efficient.

Consider your position on air source or ground source heat pumps, solar panels, mechanical ventilation with heat recovery, rainwater harvesting, green roofs, and embodied carbon in construction materials. Even if you do not have firm views on every technology, stating your general approach helps your architect make consistent decisions throughout the design.

Planning policy increasingly requires new-build homes to achieve higher sustainability standards, so there may be minimum requirements that apply regardless of your personal preferences. Your architect will advise on the policy context specific to your site.

Planning Context

If you have already had pre-application discussions with the local planning authority, or if there are specific planning policies that affect your site, include this information in your brief. For sites in Hampstead, this often includes conservation area policies and design expectations, restrictions on height, bulk, and massing, requirements for materials and architectural character, tree protection constraints, and any site-specific policies in the local plan or neighbourhood plan.

Your architect will carry out their own planning research, but any information you can provide at the outset saves time and helps them understand the design parameters from the start.

How Architects Use the Brief

A good brief does not constrain your architect — it liberates them. With a clear understanding of your needs, priorities, and constraints, the architect can develop concept designs that are grounded in reality and genuinely responsive to your requirements.

The typical design process begins with the architect studying the brief alongside the site information, developing initial concept options that explore different approaches to the plan, section, and massing, and then presenting these options to you for discussion. Your brief is the reference point against which each option is evaluated. Does it deliver the accommodation you need? Does it respect the adjacencies you described? Does it work within the budget? Does it respond to the site?

As the design develops, the brief may evolve. You may discover that some requirements are less important than you thought, or that new possibilities emerge from the architect's design work. This is normal and healthy. The brief is a starting point, not a contract. But having that starting point clearly articulated makes the entire process more efficient and more likely to produce a home that truly works for you.

Getting Started

When you come to us to find an architect for a new-build project, we encourage you to begin drafting your brief before the first meeting. It does not need to be polished or comprehensive — even a rough document covering the key points above gives the architect something concrete to respond to. The architects we connect you with are experienced in interpreting and developing client briefs, and they will help you refine your thinking as the project progresses.