design and professional project teams
Property family · Residential
Design, build and improve
Design, construction, extensions, conversions, refurbishment, kitchens, bathrooms and complete residential improvement projects.
Tell Property AI what you need
Start with a complete property family, then move into the service or goods category that matches the need.
Useful for
Homeowners and residentsLandlords and managing agentsResidential portfolio teams
In depth
Understand the property decision before choosing.
Design, construction, extensions, conversions, refurbishment, kitchens, bathrooms and complete residential improvement projects.
This family contains 2 substantial property-service categories, each with its own category, subcategory, focused and exact pages.
Browse until the requirement is clear, or take the complete family context into Property AI at any point.
See the property context
Take a property idea through to a finished space
What do you want to change, create or improve?
What this area covers
Take a property idea through to a finished space
What do you want to change, create or improve?
extensions, conversions and construction
refurbishment, fit-out and interior renewal
Continue your route
Choose a service or goods category
Single-option wrapper levels are skipped here so the next genuine services or goods choices are visible immediately.
Service or goods category
Design and construction
Design coordination, construction, extensions, conversions and development delivery. Explore the main design and construction categories, exact needs and connected property routes for homeowners, residents, landlords and residential property teams.
Open this pageService or goods category
Refurbishment and fit-out
Planned renewal, interior fit-out, adaptation and property improvement programmes. Explore the main refurbishment and fit-out categories, exact needs and connected property routes for homeowners, residents, landlords and residential property teams.
Open this pageApply the property context
Then narrow it for the building or use.
These are adaptations of the core route—not extra services counted as catalogue breadth.
occupied homesHome development projects for occupied homesOpen contextual guidance →landlords and rental propertiesHome development projects for landlords and rental propertiesOpen contextual guidance →flats and managed blocksHome development projects for flats and managed blocksOpen contextual guidance →period and heritage homesHome development projects for period and heritage homesOpen contextual guidance →planned home careHome development projects for planned home careOpen contextual guidance →home buyers and ownersPre-construction services for home buyers and ownersOpen contextual guidance →landlords and rental portfoliosPre-construction services for landlords and rental portfoliosOpen contextual guidance →leasehold and managed propertyPre-construction services for leasehold and managed propertyOpen contextual guidance →period and heritage propertyPre-construction services for period and heritage propertyOpen contextual guidance →residential development decisionsPre-construction services for residential development decisionsOpen contextual guidance →
What affects cost?
Price follows the real requirement.
Mayfair will confirm the scope before giving cost guidance. The main variables are:
- property and asset type
- scope, quantity and specification
- access, location and working hours
- urgency, phasing and specialist requirements
How to choose
Compare what matters.
Property AI can help compare:
- planned versus urgent need
- repair versus replacement
- single item versus complete package
- direct delivery versus coordinated specialist route
The Mayfair route
Simple from here.
One customer-facing journey, with the delivery, sourcing and specialist routes coordinated behind it.
- 1
Tell Property AI what you are trying to achieve.
- 2
Mayfair checks the property, location, specification and any constraints.
- 3
Mayfair confirms the appropriate delivery route, scope and next action.
Clear responsibility
Mayfair remains your single point of contact while the right delivery and specialist route is confirmed privately.
Before you start
Helpful, not essential.
You can begin with very little. These details simply help Mayfair reach the right answer faster.
- property type and postcode
- the outcome you want
- timing or urgency
- photos, measurements or documents where available
Common questions
Good to know.
What does design, build and improve include?
Design, build and improve covers the closest route described on this page, including scope, preparation, comparisons, professional boundaries and the next service, supply or referral step. Start with property type and postcode, the outcome you want, timing or urgency.
What affects the cost of design, build and improve?
The main variables are property and asset type, scope, quantity and specification, access, location and working hours, urgency, phasing and specialist requirements. Mayfair confirms these against the property and required outcome before giving tailored cost guidance.
What should be checked before arranging design, build and improve?
Check the existing property or product condition, access, responsibilities, timing and any regulated or specialist dependencies. For this route the first useful details are property type and postcode, the outcome you want, timing or urgency, photos, measurements or documents where available.
Can design, build and improve be considered in London and elsewhere in the UK?
Start with Marylebone. Serviceability, access and any local planning, landlord, lease or operational requirements are confirmed before the route proceeds.
Research and guidance
Sources behind this guidance.
General property guidance is separated from the facts and professional advice required for the actual property. Last reviewed 31 August 2026.
Ministry of Housing, Communities and Local GovernmentBuilding Regulations Approved DocumentsEngland · governmentGoogle Search CentralCreating helpful, reliable, people-first contentGlobal · search guidanceGoogle Search CentralHelp Google understand your ecommerce site structureGlobal · search guidanceGoogle Search CentralSpam policies for Google web searchGlobal · search guidance
Indexing and evidence
Expanded route written for a distinct property situation, use case or specification. Statutory decisions, certifications and professional conclusions remain with the responsible authority or qualified person.
Browse by location
Options for Marylebone
Location can affect access, timing, regulations, property stock and the available delivery route.
Local property context
Design, build and improve in Marylebone.
Marylebone is a customer-recognised area within City of Westminster. Property type, street access, tenure and conservation or managed-building context can vary within the area, so the page carries the location into the enquiry without assuming facts about an individual address.
Illustrative planning scenario—not a claimed completed Mayfair project. Published case studies will use verified project evidence only.- Access and logisticsParking controls, loading restrictions, narrow streets, lifts, concierge arrangements, shared entrances and restricted working hours can materially affect attendance, delivery and installation in Marylebone. These constraints are checked before timing or price is confirmed.
- Property responsibilitiesConservation areas, listed buildings, leasehold boundaries, freeholder or managing-agent rules and local-authority controls can be relevant in Marylebone. Permission, compliance and professional conclusions remain with the responsible owner, authority or qualified adviser.
- Route-specific checksFor design, build and improve, start with property type and postcode, the outcome you want, timing or urgency, photos, measurements or documents where available.
- Useful evidencePhotos, dimensions, existing records and a clear description of the outcome make the next step more accurate.