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The Daily Insight

Are lump sum and GMP the same

Author

Jessica Wood

Published Apr 15, 2026

Lump sum — or fixed price — and cost-based contracts are the two main players in this arena, the latter of which is the basis for the cost-plus-fee with a guaranteed maximum price contract, or GMP. … There is a cap on how much the owner will pay the contractor, and this cap is the guaranteed maximum price.

What is a GMP allowance?

Allowances are typically used to cover the scope of items where the extent of the work is not known at the time the guaranteed maximum price (GMP) is submitted.

What is the difference between GMP and Cost Plus?

That is why cost-plus pricing is often combined with a guaranteed maximum price (GMP). Cost-plus with GMP provides an upper limit on total construction costs and fees for which an owner is responsible. If the party providing the work under this pricing method runs over GMP, it is responsible for such overruns.

Is GMP a fixed price contract?

A guaranteed maximum price (also known as GMP, not-to-exceed price, NTE, or NTX) contract is a cost-type contract (also known as an open-book contract) such that the contractor is compensated for actual costs incurred plus a fixed fee, limited to a maximum price.

Does GMP include contingency?

Because the construction contingency is included in the GMP amount, 100% of the contingency is ‘at risk’, and in the best case scenarios, the owner/developer will only recover a portion of the contingency.

How do you calculate GMP?

  1. the total number of years in working life (from 6 April 1978 or 6 April following 16th birthday if later)
  2. multiplied by 20%
  3. divided by 52.

How a GMP contract works?

What Are Guaranteed Maximum Price (GMP) Contracts? With GMP contracts, the customer agrees to reimburse the contractor for materials, labor and the contractor’s fee that covers profit. … Contractors are responsible for any cost overruns beyond the maximum price unless there are changes to the project design or scope.

What is a GMP proposal?

A GMP proposal is a statement by a contractor manager of Guaranteed Maximum Price. It is added as an “Amendment and Agreement” after all the details of the construction are discussed with the construction manager, the architect/engineer team and the hiring company.

What is the difference between lump sum and Guaranteed Maximum Price?

Unlike a lump sum contract wherein a contractor is paid a flat fee for the work, the guaranteed maximum price contract allows the owner to potentially save money if the project ends up costing less than estimated. … The total cost to the owner may be less than the guaranteed maximum price, but it will not exceed it.

Can a lump sum contract be audited?

Financial records for lump-sum contracts are usually not subject to an audit because the owner has agreed to pay one fixed price regardless of whether the documentation backs it up.

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What are some of the potential issues with a GMP contract?

Disadvantages to the contractor : He may miscalculate the costs and may have to bear losses in the event of cost overruns. Due to the possibility of losses, the contractor may quote the higher price for the job and may lose the contract in competitive bidding.

What is the meaning of lump sum contract?

A lump sum contract or “fixed fee contract” is a traditional means of procurement in which a single “lump sum” price for all of the works is agreed upon before the works starts. … This means that the contractor is able to accurately price the risk they are being asked to accept.

What are the disadvantages of lump sum contracts?

  • Lump sum contracts pose greater risk to contractor.
  • Quantifying changes is a big challenge. …
  • Rejection of change order requested by the employer.
  • The building and construction design and plans have to be completed well before beginning the execution of activities.

What does GMP stand for?

Good manufacturing practice (GMP) is a system for ensuring that products are consistently produced and controlled according to quality standards.

What is a Guaranteed Maximum Price GMP contract?

A guaranteed maximum price contract is a hybrid of a cost reimbursable contract and a fixed lump sum. A contractor is reimbursed the costs that it actually incurs when they are incurred, which assists with cashflow. However, unlike an alliance, those costs are capped at the Guaranteed Maximum Price or the GMP.

What is a GMP in real estate?

A GMP, or a Guaranteed Maximum Price, is one of the most common pricing structures used by construction contractors. Under a GMP contract, the contractor is compensated for actual costs incurred, plus a fixed fee which covers risk. … Distribution of any cost savings depends on the contract.

What is the difference between an allowance and contingency?

While both relatively simple concepts, allowances and contingencies are often confused with one another. … An easy way to remind oneself of the difference is: allowances are for known unknowns, and contingencies are for unknown unknowns.

What is a GMP schedule?

What is a Guaranteed Maximum Price (GMP) Contract? A guaranteed maximum price contract sets a limit, or maximum price, that the customer will have to pay their contractor or subcontractor, regardless of the actual costs incurred.

What are the different types of contracts in construction?

  • Commercial contract.
  • Domestic building contract.
  • Percentage rate contract.
  • Item rate contract or Unit price contract.
  • Lump sum and scheduled contract.
  • Cost plus fixed fee contract.
  • Cost plus percentage of cost contract.
  • Subcontract agreement.

What does IPD mean in construction?

Integrated Project Delivery For Public and Private Owners defines IPD in the following two ways: IPD as a Delivery Method is a delivery methodology that fully integrates project teams in order to take advantage of the knowledge of all team members to maximize the project outcome.

Can I take my GMP as a lump sum?

Triviality – As with other benefits, small pensions containing GMP rights can be paid as a one off lump sum (known as a trivial commutation lump sum) subject to the triviality rules.

Is GMP paid in addition to State Pension?

There is a link between the GMP and the additional State Pension in that, when a person reaches pensionable age, the total amount of GMP is subtracted from the total amount of additional state pension built up between 1978 and 1997, and any net amount is paid.

Does GMP affect State Pension?

If you have a Guaranteed Minimum Pension ( GMP ) the new State Pension could affect the amount of money you get when your reach your State Pension age.

Is lump sum the same as fixed price?

Lump sum (or stipulated sum) contracts are sometimes referred to as ‘fixed price‘ or ‘firm price’ contracts, although strictly this is not correct. … If the actual cost of the works exceeds the agreed price, then the contractor must bear the additional expense.

What are the advantages and disadvantages of lump sum contract?

A lump sum agreement presents a higher risk to a contractor. Measuring the number of changes is difficult. Such contracts require paperwork and records of change orders from each phase, and this means further documentation is needed. A rejection of change order can be asked for by the employer.

What are the three main contract types used in construction?

  • FIXED PRICE. Fixed price construction contracts, also commonly referred to as “lump sum” or “stipulated sum” contracts, are the most common types of construction contracts. …
  • COST PLUS. …
  • GUARANTEED MAXIMUM PRICE.

How do you audit a construction contract?

  1. Read significant contracts. …
  2. Recognize that the longer the contract period, the greater the risk that an estimate will be incorrect. …
  3. Visit construction contract sites. …
  4. Meet with project managers. …
  5. Test contract costs to make sure that costs are matched with appropriate contracts.

What is IGMP in construction?

Initial Guaranteed Maximum Price. In construction project management.

What is a material allowance?

MATERIAL ALLOWANCE: The amount of money allocated to cover the cost of material(s) and any applicable sales tax only, excluding the labor to install the specified material(s), overhead and profit not included.

What are the advantages of a lump sum contract?

  • Low risk to the owner.
  • ‘Fixed’ construction cost.
  • Minimize change orders.
  • Owner supervision is reduced when compared to Time and Material Contract.
  • The contractor will try to complete the project faster.
  • Accepted widely as a contracting method.

Why is lump sum contract good?

The advantages of a lump sum contract include: Lump sum contracts can be seen to reduce client risk as the price is fixed (although in reality it is still likely to vary, but not by as much as some other forms of contracting). It is widely accepted and understood as a method of contracting.